Integrated Taxonomic Information System - Taxon Author Search Results

Source: Lamiales of North America Update, database (version 2011)

ITIS records citing this source
 
 Kingdom Plantae
  Acanthaceae -- accepted -- acanthacées
  Acanthomintha (A. Gray) A. Gray -- accepted -- thornmint, thorn-mint
  Acanthomintha duttonii (Abrams) Jokerst -- accepted -- San Mateo thorn-mint
  Acanthomintha ilicifolia (A. Gray) A. Gray -- accepted -- San Diego thornmint, San Diego thorn-mint
  Acanthomintha lanceolata Curran -- accepted -- Santa Clara thorn-mint
  Acanthomintha obovata Jeps. -- accepted -- San Benito thorn-mint
  Acanthomintha obovata ssp. cordata Jokerst -- accepted -- heartleaf thorn-mint
  Acanthomintha obovata ssp. duttonii Abrams -- not accepted -- San Mateo thornmint
  Acanthomintha obovata ssp. obovata Jeps. -- accepted -- San Benito thornmint
  Acanthus L. -- accepted
  Acanthus ebracteatus Vahl -- accepted -- acanthus
  Acanthus mollis L. -- accepted -- bear's breech
  Acanthus polystachyus Delile -- accepted
  Acanthus polystachyus var. pseudopubescens Cufod. -- accepted
  Acanthus pubescens Engl. -- not accepted
  Acanthus spinosus L. -- accepted -- spine acanthus
  Acanthus syriacus Boiss. -- accepted -- Syrian acanthus
  Acinos Mill. -- not accepted
  Acinos arvensis (Lam.) Dandy -- not accepted -- basil thyme
  Acinos thymoides (L.) Moench -- not accepted
  Adenocalymma Mart. ex Meisn. -- accepted
  Adenocalymma alliaceum (Lam.) Miers. -- not accepted
  Adenocalymma obovatum Urb. -- not accepted
  Adenoplea lindleyana (Fortune) Small -- not accepted
  Adhatoda Mill. -- not accepted
  Adhatoda candicans Nees -- not accepted
  Adhatoda carthaginensis (Jacq.) Nees -- not accepted
  Adhatoda dipteracantha Nees -- not accepted
  Adhatoda longiflora Torr. -- not accepted
  Adhatoda vasica Nees -- not accepted
  Aeginetia L. -- accepted
  Aeginetia indica L. -- accepted -- ye gu
  Aegiphila Jacq. -- accepted -- spiritweed
  Aegiphila elata Sw. -- accepted -- tall spiritweed
  Aegiphila integrifolia (Jacq.) B.D. Jacks. -- accepted -- entireleaf spiritweed
  Aegiphila martinicensis Jacq. -- accepted -- Caribbean spiritweed
  Aegiphila martinicensis var. oligoneura (Urb.) Moldenke -- not accepted
  Afzelia cassioides J.F. Gmel. -- not accepted
  Afzelia macrophylla (Nutt.) Kuntze -- not accepted
  Afzelia pectinata (Pursh) Kuntze -- not accepted
  Afzelia pectinata ssp. peninsularis Pennell -- not accepted
  Agalinis Raf. -- accepted -- false foxglove
  Agalinis acuta Pennell -- not accepted -- sandplain gerardia, sandplain false foxglove
  Agalinis aphylla (Nutt.) Raf. -- accepted -- scaleleaf false foxglove
  Agalinis aspera (Douglas ex Benth.) Britton -- accepted -- rough foxglove, tall false foxglove
  Agalinis auriculata (Michx.) S.F. Blake -- accepted -- earleaf false foxglove
  Agalinis besseyana (Britton) Britton -- not accepted
  Agalinis caddoensis Pennell -- accepted -- Caddo false foxglove
  Agalinis calycina Pennell -- accepted -- leoncita false foxglove
  Agalinis decemloba (Greene) Pennell -- accepted -- ten-lobed false foxglove
  Agalinis delicatula Pennell -- not accepted
  Agalinis densiflora (Benth.) S.F. Blake -- accepted -- Osage false foxglove
  Agalinis divaricata (Chapm.) Pennell -- accepted -- pineland false foxglove
  Agalinis edwardsiana Pennell -- accepted -- plateau false foxglove
  Agalinis edwardsiana var. glabra Pennell -- not accepted
  Agalinis fasciculata (Elliott) Raf. -- accepted -- beach false foxglove
  Agalinis fasciculata var. peninsularis Pennell -- not accepted
  Agalinis filicaulis (Benth.) Pennell -- accepted -- Jackson false foxglove
  Agalinis filifolia (Nutt.) Raf. -- accepted -- Seminole false foxglove
  Agalinis flava (L.) B. Boivin -- not accepted
  Agalinis flava var. macrantha (Pennell) B. Boivin -- not accepted
  Agalinis flexicaulis Hays -- accepted -- Hampton false foxglove
  Agalinis gattingeri (Small) Small -- accepted -- roundstem false foxglove
  Agalinis georgiana (C.L. Boynt.) Pennell -- accepted
  Agalinis grandiflora (Benth.) S.F. Blake -- not accepted
  Agalinis grandiflora var. serrata (Torr. ex Benth.) S.F. Blake -- not accepted
  Agalinis harperi Pennell -- accepted -- coastal plain false foxglove
  Agalinis heterophylla (Nutt.) Small -- accepted -- prairie false-foxglove, prairie false foxglove
  Agalinis holmiana Pennell -- not accepted
  Agalinis homalantha Pennell -- accepted -- San Antonio false foxglove
  Agalinis keyensis Pennell -- not accepted
  Agalinis laevigata (Raf.) S.F. Blake -- not accepted
  Agalinis laxa Pennell -- accepted -- twoline false foxglove
  Agalinis levigata (Raf.) S.F. Blake -- not accepted
  Agalinis linifolia (Nutt.) Britton -- accepted -- flaxleaf false foxglove
  Agalinis maritima (Raf.) Raf. -- accepted -- seaside gerardia, saltmarsh false foxglove
  Agalinis maritima var. grandiflora (Benth.) Shinners -- accepted -- saltmarsh false foxglove
  Agalinis maritima var. maritima (Raf.) Raf. -- accepted -- saltmarsh false foxglove
  Agalinis navasotensis Dubrule & Canne-Hill. -- accepted -- Navasota false foxglove
  Agalinis neoscotica (Greene) Fernald -- accepted -- Middleton false foxglove
  Agalinis nuttallii Shinners -- not accepted -- Nuttall's false foxglove
  Agalinis obtusifolia Raf. -- accepted -- tenlobe false foxglove
  Agalinis oligophylla Pennell -- accepted -- ridgestem false foxglove
  Agalinis oligophylla var. pseudaphylla Pennell -- not accepted
  Agalinis parvifolia (Chapm.) Small ex Britton -- not accepted
  Agalinis paupercula (A. Gray) Britton -- not accepted -- smallflower false foxglove
  Agalinis paupercula var. borealis Pennell -- not accepted -- smallflower false foxglove
  Agalinis paupercula var. neoscotica (Greene) Pennell & H. St. John -- not accepted
  Agalinis paupercula var. paupercula (A. Gray) Britton -- not accepted -- smallflower false foxglove
  Agalinis pedicularia (L.) S.F. Blake -- not accepted
  Agalinis pedicularia var. ambigens (Fernald) S.F. Blake -- not accepted
  Agalinis pedicularia var. caesariensis (Pennell) S.F. Blake -- not accepted
  Agalinis pedicularia var. pectinata (Nutt.) S.F. Blake -- not accepted
  Agalinis pinetorum Pennell -- not accepted -- coastalplain false foxglove, coastal plain false foxglove
  Agalinis pinetorum var. delicatula (Pennell) Pennell -- not accepted
  Agalinis plukenetii (Elliott) Raf. -- accepted -- Chattahoochee false foxglove
  Agalinis pseudaphylla (Pennell) Shinners -- not accepted
  Agalinis pulchella Pennell -- accepted -- purple gerardia, St. Mark's false foxglove
  Agalinis purpurea (L.) Pennell -- accepted -- purple false foxglove
  Agalinis purpurea var. carteri Pennell -- not accepted
  Agalinis purpurea var. neoscotica (Greene) B. Boivin -- not accepted
  Agalinis purpurea var. parviflora (Benth.) B. Boivin -- accepted -- smallflower false foxglove
  Agalinis purpurea var. purpurea (L.) Pennell -- accepted -- purple false foxglove
  Agalinis purpurea var. racemulosa (Pennell) B. Boivin -- not accepted
  Agalinis setacea (J.F. Gmel.) Raf. -- accepted -- threadleaf false foxglove
  Agalinis skinneriana (Alph. Wood) Britton -- accepted -- Skinner's false foxglove
  Agalinis spiciflora (Engelm.) Pennell -- not accepted
  Agalinis stenophylla Pennell -- not accepted
  Agalinis strictifolia (Benth.) Pennell -- accepted -- stiffleaf false foxglove
  Agalinis tenella Pennell -- accepted
  Agalinis tenuifolia (Vahl) Raf. -- accepted -- slender-leaf false foxglove, slenderleaf false foxglove
  Agalinis tenuifolia ssp. leucanthera (Raf.) Pennell -- not accepted
  Agalinis tenuifolia var. leucanthera (Raf.) Pennell -- not accepted -- slenderleaf false foxglove
  Agalinis tenuifolia var. macrophylla (Benth.) S.F. Blake -- not accepted -- slenderleaf false foxglove
  Agalinis tenuifolia var. parviflora (Nutt.) Pennell -- not accepted -- slender-leaf false foxglove, slenderleaf false foxglove
  Agalinis tenuifolia var. polyphylla (Small) Pennell -- not accepted -- slenderleaf false foxglove
  Agalinis tenuifolia var. tenuifolia (Vahl) Raf. -- not accepted -- slenderleaf false foxglove
  Agalinis virgata Raf. -- not accepted
  Agalinis virginica (L.) S.F. Blake -- not accepted
  Agalinis viridis (Small) Pennell -- accepted -- green false foxglove
  Agastache Clayton ex Gronov. -- accepted -- giant hyssop
  Agastache anethiodora (Nutt.) Britton -- not accepted
  Agastache barberi (B.L. Rob.) Epling -- not accepted
  Agastache breviflora (A. Gray) Epling -- accepted -- Trans-Pecos giant hyssop
  Agastache breviflora var. havardii (A. Gray) Shinners -- not accepted
  Agastache cana (Hook.) Wooton & Standl. -- accepted -- mosquito plant
  Agastache cusickii (Greenm.) A. Heller -- accepted -- nettleleaf horsemint, Cusick's giant hyssop
  Agastache cusickii var. parva Cronquist -- not accepted
  Agastache foeniculum (Pursh) Kuntze -- accepted -- blue giant-hyssop, blue giant hyssop
  Agastache greenei (Briq.) Wooton & Standl. -- not accepted
  Agastache mearnsii Wooton & Standl. -- accepted -- San Luis Mountain giant hyssop
  Agastache micrantha (A. Gray) Wooton & Standl. -- accepted -- white giant hyssop
  Agastache neomexicana (Briq.) Standl. -- not accepted
  Agastache nepetoides (L.) Kuntze -- accepted -- catnip giant hyssop, yellow giant hyssop
  Agastache occidentalis (Piper) A. Heller -- accepted -- western giant hyssop
  Agastache pallida (Lindl.) Cory -- accepted -- pale giant hyssop
  Agastache pallidiflora (A. Heller) Rydb. -- accepted -- Bill Williams Mountain giant hyssop
  Agastache pallidiflora ssp. havardii (A. Gray) Lint & Epling -- not accepted
  Agastache pallidiflora ssp. mearnsii (Wooton & Standl.) Lint & Epling -- not accepted
  Agastache pallidiflora ssp. neomexicana (Briq.) Lint & Epling -- accepted -- New Mexican giant hyssop, Bill Williams Mountain giant hyssop
  Agastache pallidiflora ssp. neomexicana var. havardii (A. Gray) R.W. Sanders -- not accepted -- Bill Williams Mountain giant hyssop, Havard's giant hyssop
  Agastache pallidiflora ssp. neomexicana var. neomexicana (Briq.) R.W. Sanders -- not accepted -- Bill Williams Mountain giant hyssop, New Mexico giant hyssop
  Agastache pallidiflora ssp. pallidiflora (A. Heller) Rydb. -- accepted -- pallid flower giant hyssop, Bill Williams Mountain giant hyssop
  Agastache pallidiflora ssp. pallidiflora var. gilensis R.W. Sanders -- not accepted -- Bill Williams Mountain giant hyssop, Bill William's hyssop
  Agastache pallidiflora ssp. pallidiflora var. greenei (Briq.) R.W. Sanders -- not accepted -- Bill Williams Mountain giant hyssop
  Agastache pallidiflora ssp. pallidiflora var. pallidiflora (A. Heller) Rydb. -- not accepted -- Bill Williams Mountain giant hyssop, pallid flower giant hyssop
  Agastache pallidiflora ssp. typica Lint & Epling -- not accepted
  Agastache pallidiflora var. gilensis R.W. Sanders -- accepted -- Bill Williams Mountain giant hyssop
  Agastache pallidiflora var. greenei (Briq.) R.W. Sanders -- accepted -- Bill Williams Mountain giant hyssop
  Agastache pallidiflora var. havardii (A. Gray) R.W. Sanders -- accepted -- Bill Williams Mountain giant hyssop
  Agastache pallidiflora var. neomexicana (Briq.) R.W. Sanders -- accepted -- Bill Williams Mountain giant hyssop
  Agastache pallidiflora var. pallidiflora (A. Heller) Rydb. -- accepted -- Bill Williams Mountain giant hyssop
  Agastache parvifolia Eastw. -- accepted -- small-leaved agastache, smallleaf giant hyssop
  Agastache pringlei (Briq.) Lint & Epling -- accepted -- Pringle's giant hyssop
  Agastache pringlei var. verticillata (Wooton & Standl.) R.W. Sanders -- accepted -- Pringle's giant hyssop
  Agastache rupestris (Greene) Standl. -- accepted -- thread-leaf giant hyssop, threadleaf giant hyssop
  Agastache scrophulariifolia (Willd.) Kuntze -- accepted -- purple giant hyssop
  Agastache scrophulariifolia var. mollis (Fernald) A. Heller -- not accepted
  Agastache urticifolia (Benth.) Kuntze -- accepted -- horsemint giant hyssop, nettleleaf giant hyssop
  Agastache urticifolia var. glaucifolia (A. Heller) Cronquist -- accepted -- nettleleaf giant hyssop
  Agastache urticifolia var. urticifolia (Benth.) Kuntze -- accepted -- nettleleaf giant hyssop
  Agastache verticillata Wooton & Standl. -- not accepted
  Agastache wrightii (Greenm.) Wooton & Standl. -- accepted -- Sonoran giant hyssop
  Ajuga L. -- accepted -- bugle
  Ajuga chamaepitys (L.) Schreb. -- accepted -- yellow bugle
  Ajuga genevensis L. -- accepted -- blue bugle
  Ajuga reptans L. -- accepted -- common bugle
  Alectra Thunb. -- accepted
  Alectra aspera (Cham. & Schltdl.) L.O. Williams -- accepted
  Alectra capensis Thunb. -- accepted
  Alectra fluminensis (Vell.) Stearn -- not accepted -- yerba de hierro
  Alloplectus Mart. -- accepted
  Alloplectus ambiguus Urb. -- not accepted
  Aloysia Juss. -- accepted -- beebrush
  Aloysia citridora Paláu -- not accepted
  Aloysia citriodora Paláu -- not accepted
  Aloysia citrodora Paláu -- accepted -- lemon beebrush
  Aloysia gratissima (Gillies & Hook.) Tronc. -- accepted -- whitebrush
  Aloysia gratissima var. gratissima (Gillies & Hook.) Tronc. -- accepted -- whitebrush
  Aloysia gratissima var. schulziae (Standl.) L.D. Benson -- accepted -- bee blossum, whitebrush
  Aloysia ligustrina (Lag.) Small -- not accepted
  Aloysia lycioides Cham. -- not accepted
  Aloysia lycioides var. schulziae (Standl.) Moldenke -- not accepted
  Aloysia macrostachya (Torr.) Moldenke -- accepted -- Rio Grande beebrush
  Aloysia triphylla (L'Hér.) Britton -- not accepted -- lemon beebrush
  Aloysia wrightii (A. Gray) A. Heller -- accepted -- mintbush lippia, lemon verbena, Wright's aloysia, Wright's lippia, Wright's beebrush
  Amarolea americana (L.) Small -- not accepted
  Amarolea megacarpa Small -- not accepted
  Amphianthus Torr. -- not accepted
  Amphianthus pusillus Torr. -- not accepted -- little amphianthus
  Amphilophium Kunth -- accepted
  Amphilophium paniculatum (L.) Kunth -- accepted -- liana de cuello
  Amphitecna Miers -- accepted -- black calabash
  Amphitecna latifolia (Mill.) A.H. Gentry -- accepted -- black calabash
  Andrographis Wall. ex Nees -- accepted -- false waterwillow
  Andrographis echioides (L.) Nees -- accepted -- false waterwillow
  Andrographis paniculata (Burm. f.) Wall. ex Nees -- accepted
  Anemopaegma Mart. ex Meisn. -- accepted
  Anemopaegma carrerense Arm. -- not accepted
  Anemopaegma karstenii Bureau & K. Schum. -- accepted
  Anemopaegma tobagense Urb. -- not accepted
  Angelonia Humb. & Bonpl. -- accepted -- angelon
  Angelonia angustifolia Benth. -- accepted -- narrowleaf angelon
  Angelonia salicariifolia Humb. & Bonpl. -- accepted -- willowleaf angelon
  Anisacanthus Nees -- accepted -- desert honeysuckle
  Anisacanthus insignis A. Gray -- not accepted
  Anisacanthus insignis var. linearis S.H. Hagen -- not accepted
  Anisacanthus junceus (Torr.) Hemsl. -- not accepted
  Anisacanthus linearis (S.H. Hagen) Henrickson & E.J. Lott -- accepted -- dwarf anisacanth, narrowleaf desert honeysuckle
  Anisacanthus puberulus (Torr.) Henrickson & E.J. Lott -- accepted -- dwarf desert honeysuckle
  Anisacanthus quadrifidus (Vahl) Nees -- accepted -- Wright's desert honeysuckle
  Anisacanthus quadrifidus var. wrightii (Torr.) Henrickson -- accepted -- Wright's anisacanth, Wright's desert honeysuckle
  Anisacanthus thurberi (Torr.) A. Gray -- accepted -- desert honeysuckle, Thurber's desert honeysuckle
  Anisacanthus wrightii (Torr.) A. Gray -- not accepted
  Anisostichus capreolata (L.) Bureau -- not accepted
  Anisostichus crucigera (L.) Bureau -- not accepted
  Anoplanthus fasciculatus (Nutt.) Walp. -- not accepted
  Anthacanthus spinosus (Jacq.) Nees -- not accepted
  Antirrhinum L. -- accepted -- snapdragon
  Antirrhinum bellidifolium L. -- accepted -- lilac snapdragon
  Antirrhinum breweri A. Gray -- not accepted
  Antirrhinum calycinum Banks & Sol. -- not accepted
  Antirrhinum cooperi A. Gray -- not accepted
  Antirrhinum cornutum Benth. -- not accepted
  Antirrhinum cornutum var. leptaleum (A. Gray) Munz -- not accepted
  Antirrhinum coulterianum Benth. ex A. DC. -- not accepted
  Antirrhinum coulterianum ssp. orcuttianum (A. Gray) Pennell -- not accepted
  Antirrhinum cyathiferum Benth. -- not accepted
  Antirrhinum elatine L. -- not accepted
  Antirrhinum elmeri Rothm. -- not accepted
  Antirrhinum filipes A. Gray -- not accepted
  Antirrhinum hookerianum Pennell ex Millsp. -- not accepted
  Antirrhinum kelloggii Greene -- not accepted
  Antirrhinum kingii S. Watson -- not accepted
  Antirrhinum kingii var. watsonii (Vasey & Rose) Munz -- not accepted
  Antirrhinum leptaleum A. Gray -- not accepted
  Antirrhinum majus L. -- accepted -- garden snapdragon
  Antirrhinum maurandioides A. Gray -- not accepted
  Antirrhinum multiflorum Pennell -- not accepted
  Antirrhinum nuttallianum Benth. ex A. DC. -- not accepted
  Antirrhinum nuttallianum ssp. nuttallianum Benth. ex A. DC. -- not accepted -- snapdragon
  Antirrhinum nuttallianum ssp. subsessile (A. Gray) D.M. Thomps. -- not accepted
  Antirrhinum orontium L. -- not accepted -- lesser snapdragon, linearleaf snapdragon
  Antirrhinum orontium var. grandiflorum Chav. -- not accepted
  Antirrhinum ovatum Eastw. -- not accepted -- oval-leaved snapdragon
  Antirrhinum spurium L. -- not accepted
  Antirrhinum subcordatum A. Gray -- not accepted -- dimorphic snapdragon
  Antirrhinum subsessile A. Gray -- not accepted
  Antirrhinum tenellum Pursh -- not accepted
  Antirrhinum vexillo-calyculatum ssp. vexillo-calyculatum Kellogg -- not accepted -- snapdragon
  Antirrhinum vexillocalyculatum Kellogg -- not accepted
  Antirrhinum vexillocalyculatum ssp. breweri (A. Gray) D.M. Thomps. -- not accepted
  Antirrhinum vexillocalyculatum ssp. intermedium D.M. Thomps. -- not accepted
  Antirrhinum virga A. Gray -- not accepted
  Antirrhinum watsonii Vasey & Rose -- not accepted
  Antirrhinum wislizeni (Engelm. ex A. Gray) Tidestr. -- not accepted
  Apassalus humistratus (Michx.) Kobuski -- not accepted
  Aphelandra R. Br. -- accepted
  Aphelandra incerta Leonard -- not accepted
  Aphelandra pulcherrima (Jacq.) Kunth -- accepted
  Aphyllon arenosum Suksd. -- not accepted
  Aphyllon cooperi A. Gray -- not accepted
  Aphyllon dugesii S. Watson -- not accepted
  Aphyllon fasciculatum (Nutt.) Torr. & A. Gray -- not accepted
  Aphyllon pinorum (Geyer ex Hook.) A. Gray -- not accepted
  Aphyllon tuberosum (A. Gray) A. Gray -- not accepted
  Aphyllon uniflorum (L.) A. Gray -- not accepted
  Aranella fimbriata auct. non (Kunth) Barnhart -- not accepted
  Arrabidaea DC. -- accepted
  Arrabidaea chica (Humb. & Bonpl.) Verl. -- accepted -- cricketvine
  Arrabidaea magnifica Sprague ex Steenis -- not accepted
  Arrabidaea patellifera (Schltdl.) Sandwith -- accepted
  Arrabidaea rego (Vell.) DC. -- accepted
  Asarina acerifolia (Pennell) Pennell -- not accepted
  Asarina antirrhiniflora (Humb. & Bonpl. ex Willd.) Pennell -- not accepted
  Asarina erubescens (D. Don) Pennell -- not accepted
  Asarina filipes (A. Gray) Pennell -- not accepted
  Asarina petrophila (Coville & C.V. Morton) Pennell -- not accepted
  Asarina stricta (Hook. & Arn.) Pennell -- not accepted
  Asarina wislizeni (Engelm. ex A. Gray) Pennell -- not accepted
  Asystasia Blume -- accepted
  Asystasia coromandeliana Nees -- not accepted
  Asystasia gangetica (L.) T. Anderson -- accepted -- coromandel, Ganges primrose, Philippine violet, Chinese violet
  Audibertia mearnsii Britton -- not accepted
  Audibertia vaseyi Porter -- not accepted
  Aureolaria Raf. -- accepted -- false foxglove
  Aureolaria auriculata (Michx.) Farw. -- not accepted
  Aureolaria calycosa (Mack. & Bush) Pennell -- not accepted
  Aureolaria dispersa (Small) Pennell -- not accepted
  Aureolaria flava (L.) Farw. -- accepted -- smooth yellow false foxglove
  Aureolaria flava ssp. macrantha Pennell -- not accepted
  Aureolaria flava ssp. reticulata (Raf.) Pennell -- not accepted
  Aureolaria flava ssp. typica Pennell -- not accepted
  Aureolaria flava var. flava (L.) Farw. -- not accepted -- smooth yellow false foxglove
  Aureolaria flava var. macrantha Pennell -- not accepted -- smooth yellow false foxglove
  Aureolaria flava var. reticulata (Raf.) Pennell -- not accepted
  Aureolaria grandiflora (Benth.) Pennell -- accepted -- largeflower yellow false foxglove
  Aureolaria grandiflora ssp. cinerea (Pennell) Pennell -- not accepted
  Aureolaria grandiflora ssp. pulchra (Pennell) Pennell -- not accepted
  Aureolaria grandiflora ssp. serrata (Torr. ex Benth.) Pennell -- not accepted
  Aureolaria grandiflora ssp. typica Pennell -- not accepted
  Aureolaria grandiflora var. cinerea Pennell -- not accepted -- largeflower yellow false foxglove
  Aureolaria grandiflora var. grandiflora (Benth.) Pennell -- not accepted -- largeflower yellow false foxglove
  Aureolaria grandiflora var. pulchra Pennell -- not accepted -- largeflower yellow false foxglove
  Aureolaria grandiflora var. serrata (Torr. ex Benth.) Pennell -- not accepted -- largeflower yellow false foxglove
  Aureolaria laevigata (Raf.) Raf. -- not accepted -- entireleaf yellow false foxglove
  Aureolaria levigata (Raf.) Raf. -- accepted -- entireleaf yellow false foxglove
  Aureolaria microcarpa Pennell -- not accepted
  Aureolaria patula (Chapm.) Pennell -- accepted -- spreading yellow false foxglove
  Aureolaria pectinata (Nutt.) Pennell -- accepted -- combleaf yellow false foxglove
  Aureolaria pectinata ssp. eurycarpa (Pennell) Pennell -- not accepted
  Aureolaria pectinata ssp. floridana Pennell -- not accepted
  Aureolaria pectinata ssp. transcendens (Pennell) Pennell -- not accepted
  Aureolaria pectinata ssp. typica Pennell -- not accepted
  Aureolaria pectinata var. eurycarpa Pennell -- not accepted
  Aureolaria pectinata var. floridana (Pennell) Pennell -- not accepted
  Aureolaria pectinata var. ozarkensis Pennell -- not accepted
  Aureolaria pectinata var. transcendens Pennell -- not accepted
  Aureolaria pedicularia (L.) Raf. ex Pennell -- accepted -- fernleaf yellow false foxglove
  Aureolaria pedicularia ssp. ambigens (Fernald) Pennell -- not accepted
  Aureolaria pedicularia ssp. austromontana (Pennell) Pennell -- not accepted
  Aureolaria pedicularia ssp. caesariensis Pennell -- not accepted
  Aureolaria pedicularia ssp. carolinensis Pennell -- not accepted
  Aureolaria pedicularia ssp. intercedens (Pennell) Pennell -- not accepted
  Aureolaria pedicularia ssp. typica Pennell -- not accepted
  Aureolaria pedicularia var. ambigens (Fernald) Farw. -- not accepted -- fernleaf yellow false foxglove
  Aureolaria pedicularia var. austromontana Pennell -- not accepted -- fernleaf yellow false foxglove
  Aureolaria pedicularia var. caesariensis (Pennell) Pennell -- not accepted
  Aureolaria pedicularia var. carolinensis (Pennell) Pennell -- not accepted
  Aureolaria pedicularia var. intercedens Pennell -- not accepted -- fernleaf yellow false foxglove
  Aureolaria pedicularia var. pectinata (Nutt.) Gleason -- not accepted
  Aureolaria pedicularia var. pedicularia (L.) Raf. -- not accepted -- fernleaf yellow false foxglove
  Aureolaria reticulata Raf. -- not accepted
  Aureolaria virginica (L.) Pennell -- accepted -- downy yellow false foxglove
  Avicennia L. -- accepted -- black mangrove, mangrove
  Avicennia africana P. Beauv. -- accepted -- black mangrove
  Avicennia germinans (L.) L. -- accepted -- black mangrove
  Avicennia marina (Forssk.) Vierh. -- accepted -- gray mangrove
  Avicennia marina var. resinifera (G. Forst.) Bakh. -- accepted -- gray mangrove
  Avicennia nitida Jacq. -- not accepted
  Bacopa Aubl. -- accepted -- water hyssop, waterhyssop
  Bacopa acuminata (Walter) B.L. Rob. -- not accepted
  Bacopa acuminata var. microphylla (Raf.) Fernald -- not accepted
  Bacopa caroliniana (Walter) B.L. Rob. -- accepted -- blue waterhyssop
  Bacopa cyclophylla Fernald -- not accepted
  Bacopa egensis (Poepp.) Pennell -- accepted -- Brazilian waterhyssop
  Bacopa eisenii (Kellogg) Pennell -- accepted -- western hydranthele, Gila River waterhyssop
  Bacopa innominata (M. Gómez) Alain -- accepted -- tropical waterhyssop
  Bacopa monnieri (L.) Pennell -- accepted -- herb-of-grace, coastal waterhyssop, herb of grace
  Bacopa nobsiana H. Mason -- not accepted
  Bacopa procumbens (Mill.) Greenm. -- not accepted -- waterhyssop
  Bacopa repens (Sw.) Wettst. -- accepted -- creeping waterhyssop
  Bacopa rotundifolia (Michx.) Wettst. -- accepted -- disk water-hyssop, wet waterhyssop, disc waterhyssop, disk waterhyssop
  Bacopa simulans Fernald -- not accepted -- Chickahominy water-hyssop
  Bacopa stragula Fernald -- not accepted -- mat-forming water-hyssop
  Bacopa stricta (Schrad.) B.L. Rob. -- not accepted -- yerba de culebra
  Ballota L. -- accepted -- horehound
  Ballota borealis Schweigg. -- not accepted
  Ballota nigra L. -- accepted -- black horehound
  Ballota nigra ssp. foetida Hayek -- not accepted
  Ballota nigra var. alba (L.) Sm. -- accepted -- black horehound
  Ballota nigra var. foetida (Hayek) Vis. -- accepted -- black horehound
  Ballota nigra var. nigra L. -- accepted -- black horehound
  Barleria L. -- accepted -- Philippine violet
  Barleria coccinea L. -- not accepted
  Barleria cristata L. -- accepted -- crested Philippine violet
  Barleria lupulina Lindl. -- accepted -- hophead Philippine violet
  Barleria opaca (Vahl) Nees -- accepted -- kwahu
  Barleria prionitis L. -- accepted -- porcupine flower
  Barleria solanifolia L. -- not accepted
  Barleriola Oerst. -- accepted
  Barleriola solanifolia (L.) Oerst. ex Lindau -- accepted -- false Philippine violet
  Bartsia L. -- accepted -- velvetbells
  Bartsia alpina L. -- accepted -- velvetbells
  Bartsia trixago L. -- not accepted
  Batocydia unguis (L.) Mart. ex Britton -- not accepted
  Batocydia unguis-cati (L.) Mart. ex Britton -- not accepted
  Bellardia All. -- accepted -- lineseed
  Bellardia trixago (L.) All. -- accepted -- Mediterranean lineseed
  Beloperone californica Benth. -- not accepted
  Beloperone guttata Brandegee -- not accepted
  Berginia virgata Harv. ex Benth. & Hook. f. -- not accepted
  Besseya Rydb. -- not accepted -- kittentail
  Besseya alpina (A. Gray) Rydb. -- not accepted -- alpine besseya
  Besseya arizonica Pennell -- not accepted -- Arizona coraldrops
  Besseya bullii (Eaton) Rydb. -- not accepted -- Bull's coraldrops
  Besseya cinerea (Raf.) Pennell -- not accepted
  Besseya oblongifolia Pennell -- not accepted -- eggleaf coraldrops
  Besseya plantaginea (E. James) Rydb. -- not accepted -- White River coraldrops
  Besseya ritteriana (Eastw.) Rydb. -- not accepted -- Ritter's coraldrops
  Besseya rubra (Douglas ex Hook.) Rydb. -- not accepted -- red besseya, red kittentail
  Besseya wyomingensis (A. Nelson) Rydb. -- not accepted -- Wyoming kittentail, Wyoming besseya
  Betonica grandiflora Stephan ex Willd. -- not accepted
  Betonica officinalis L. -- not accepted
  Bignonia L. -- accepted
  Bignonia aequinoctialis L. -- not accepted
  Bignonia alliacea Lam. -- not accepted
  Bignonia capensis Thunb. -- not accepted
  Bignonia capreolata L. -- accepted -- cross vine, crossvine
  Bignonia caryophyllea Bello -- not accepted
  Bignonia linearis Cav. -- not accepted
  Bignonia pallida Lindl. -- not accepted
  Bignonia paniculata L. -- not accepted
  Bignonia pyramidata Rich. -- not accepted
  Bignonia radicans L. -- not accepted
  Bignonia rego Vell. -- not accepted
  Bignonia serratifolia Vahl -- not accepted
  Bignonia stans L. -- not accepted
  Bignonia uncata Andrews -- not accepted
  Bignonia unguis-cati L. -- not accepted
  Bignonia venusta Ker Gawl. -- not accepted
  Bignoniaceae -- accepted -- bignonias
  Biovularia olivacea (C. Wright) Kamienski -- not accepted
  Blechum P. Browne -- accepted -- blechum
  Blechum blechum (L.) Millsp. -- not accepted
  Blechum brownei Juss. -- not accepted
  Blechum pyramidatum (Lam.) Urb. -- not accepted -- Browne's blechum
  Blephilia Raf. -- accepted -- pagoda-plant
  Blephilia ciliata (L.) Benth. -- accepted -- downy blephilia, downy pagoda-plant
  Blephilia hirsuta (Pursh) Benth. -- accepted -- hairy pagoda-plant
  Blephilia hirsuta var. glabrata Fernald -- accepted -- hairy pagoda-plant
  Blephilia hirsuta var. hirsuta (Pursh) Benth. -- accepted -- hairy pagoda-plant
  Blephilia subnuda Simmers & Kral -- accepted -- Cumberland pagoda-plant
  Bontia L. -- accepted
  Bontia daphnoides L. -- accepted -- white alling
  Bontia germinans L. -- not accepted
  Boschniakia C.A. Mey. ex Bong. -- accepted -- groundcone
  Boschniakia hookeri Walp. -- not accepted -- Vancouver groundcone
  Boschniakia rossica (Cham. & Schltdl.) B. Fedtsch. -- accepted -- northern groundcone
  Boschniakia strobilacea A. Gray -- not accepted -- California groundcone
  Bouchea Cham. -- accepted
  Bouchea linifolia A. Gray -- accepted -- groovestem bouchea
  Bouchea prismatica (L.) Kuntze -- accepted -- prism bouchea
  Bouchea prismatica var. brevirostra Grenzeb. -- not accepted
  Bouchea prismatica var. longirostra Grenzeb. -- not accepted
  Bouchea spathulata Torr. -- accepted -- spoonleaf
  Brachystigma Pennell -- accepted -- desert foxglove
  Brachystigma wrightii (A. Gray) Pennell -- accepted -- Wright's brachystigma, Arizona desert foxglove
  Bramia monnieri (L.) Drake -- not accepted
  Bramia rotundifolia (Michx.) Britton -- not accepted
  Brazoria Engelm. & A. Gray -- accepted -- brazosmint, brazos-mint
  Brazoria arenaria Lundell -- accepted -- sand brazosmint, sand brazos-mint
  Brazoria enquistii M.W. Turner -- accepted
  Brazoria pulcherrima Lundell -- not accepted -- Centerville brazos-mint
  Brazoria scutellarioides Engelm. & A. Gray -- not accepted -- prairie brazosmint
  Brazoria truncata (Benth.) Engelm. & A. Gray -- accepted -- rattlesnake flower
  Brazoria truncata var. pulcherrima (Lundell) M.W. Turner -- accepted -- Centerville brazos-mint
  Brazoria truncata var. truncata (Benth.) Engelm. & A. Gray -- accepted -- rattlesnake flower
  Buchnera L. -- accepted -- bluehearts
  Buchnera americana L. -- accepted -- bupleurum, American bluehearts
  Buchnera arizonica (A. Gray) Pennell -- not accepted -- Arizona bluehearts
  Buchnera breviflora Pennell -- not accepted
  Buchnera elongata Sw. -- not accepted
  Buchnera floridana Gand. -- accepted -- Florida blueheats
  Buchnera longifolia Kunth -- accepted -- elongated bluehearts
  Buchnera obliqua Benth. -- accepted -- Arizona bluehearts
  Buchnera pusilla Kunth -- accepted -- pygmy bluehearts
  Buddleja L. -- accepted -- butterfly bush, butterflybush
  Buddleja alternifolia Maxim. -- accepted -- fountain butterflybush
  Buddleja asiatica Lour. -- accepted -- dogtail
  Buddleja davidii Franch. -- accepted -- orange eye butterflybush
  Buddleja globosa Hope -- accepted -- orange-ball-tree
  Buddleja indica Lam. -- accepted -- oakleaf butterflybush
  Buddleja lindleyana Fortune -- accepted -- Lindley's butterflybush
  Buddleja madagascariensis Lam. -- accepted -- smokebush
  Buddleja marrubiifolia Benth. -- accepted -- woolly butterflybush
  Buddleja officinalis Maxim. -- accepted -- pole butterflybush
  Buddleja racemosa Torr. -- accepted -- wand butterflybush, Texas butterflybush
  Buddleja racemosa ssp. incana (Torr.) Norm. -- not accepted -- wand butterflybush
  Buddleja racemosa ssp. racemosa Torr. -- not accepted -- wand butterflybush
  Buddleja racemosa var. incana Torr. -- accepted -- wand butterflybush
  Buddleja racemosa var. racemosa Torr. -- accepted -- wand butterflybush
  Buddleja saligna Willd. -- accepted -- squarestem butterflybush
  Buddleja scordioides Kunth -- accepted -- Escobilla butterfly-bush, escobilla butterflybush
  Buddleja sessiliflora Kunth -- accepted -- Rio Grande butterflybush, butterfly-bush
  Buddleja utahensis Coville -- accepted -- Utah butterfly-bush, Panamint butterflybush, Utah butterflybush
  Buttonia McKen ex Benth. -- accepted
  Buttonia hildebrandtii Engl. -- accepted
  Caconapea stricta (Schrad.) Britton -- not accepted
  Calamintha Mill. -- not accepted -- calamint
  Calamintha acinos (L.) Clairv. ex Gaudich. -- not accepted
  Calamintha arkansana (Nutt.) Shinners -- not accepted -- limestone calamint
  Calamintha ascendens Jord. -- not accepted
  Calamintha ashei (Weath.) Shinners -- not accepted -- Ashe's calamint
  Calamintha canescens Torr. & A. Gray ex Benth. -- not accepted
  Calamintha chandleri Brandegee -- not accepted -- San Miguel calamint, San Miguel savory
  Calamintha coccinea (Nutt. ex Hook.) Benth. -- not accepted -- scarlet calamint
  Calamintha dentata Chapm. -- not accepted -- Florida calamint
  Calamintha georgiana (R.M. Harper) Shinners -- not accepted -- Georgia calamint
  Calamintha glabella (Michx.) Benth. -- not accepted -- Ozark calamint
  Calamintha glabella var. angustifolia (Torr.) DeWolf -- not accepted
  Calamintha gracilis Benth. -- not accepted -- slender wild basil
  Calamintha ilicifolia A. Gray -- not accepted
  Calamintha nepeta (L.) Savi -- not accepted -- lesser calamint
  Calamintha nepeta ssp. glandulosa (Req.) P.W. Ball -- not accepted -- lesser calamint
  Calamintha nepeta ssp. nepeta (L.) Savi -- not accepted -- lesser calamint
  Calamintha nepetoides Jord. -- not accepted
  Calamintha officinalis auct. non Moench -- not accepted
  Calamintha sylvatica Bromf. -- not accepted -- woodland calamint
  Calamintha sylvatica ssp. ascendens (Jord.) P.W. Ball -- not accepted -- woodland calamint
  Calamintha sylvatica ssp. sylvatica Bromf. -- not accepted -- woodland calamint
  Calamintha vulgaris (L.) Druce -- not accepted
  Calceolaria L. -- accepted -- slipperwort, slipper flower
  Calceolaria chelidonioides Kunth -- not accepted -- bedding slipperwort
  Calceolaria multiflora Cav. -- not accepted -- slipper flower
  Calceolaria scabiosifolia Roem. & Schult. -- not accepted
  Calceolaria tripartita Ruiz & Pav. -- accepted -- splitleaf slipperwort
  Calceolariaceae -- accepted
  Callicarpa L. -- accepted -- beautyberry
  Callicarpa americana L. -- accepted -- American beautyberry
  Callicarpa americana var. lactea F.J. Müll. -- not accepted
  Callicarpa ampla Schauer -- accepted -- capa rosa, caparosa
  Callicarpa candicans (Burm. f.) Hochr. -- accepted
  Callicarpa candicans var. paucinervia (Merr.) Fosberg -- accepted
  Callicarpa dichotoma (Lour.) K. Koch -- accepted -- purple beautyberry
  Callicarpa formosana Rolfe -- accepted
  Callicarpa japonica Thunb. -- accepted -- Japanese callicarpa
  Callicarpa lamii Hosok. -- accepted
  Callicarpa purpurea Juss. -- not accepted
  Callitriche L. -- accepted -- water-starwort
  Callitriche anceps Fernald -- not accepted
  Callitriche austinii Engelm. -- not accepted
  Callitriche autumnalis L. -- not accepted
  Callitriche bolanderi Hegelm. -- not accepted
  Callitriche brutia Pentagna -- accepted
  Callitriche brutia var. hamulata (Kütz. ex W.D.J. Koch) Lansdown -- accepted
  Callitriche deflexa A. Braun -- not accepted
  Callitriche deflexa var. austinii (Engelm.) Hegelm. -- not accepted
  Callitriche deflexa var. subsessilis Fassett -- not accepted
  Callitriche fassettii Schotsman -- accepted -- Fassett's water-starwort
  Callitriche hamulata Kütz. ex W.D.J. Koch -- not accepted
  Callitriche hermaphroditica L. -- accepted -- northern water-starwort, autumn waterstarwort, autumn water-starwort, northern waterstarwort, scarlet waterstarwort
  Callitriche heterophylla Pursh -- accepted -- greater waterstarwort, larger waterstarwort, variedleaf waterstarwort, differentleaf waterstarwort, twoheaded water-starwort
  Callitriche heterophylla ssp. bolanderi (Hegelm.) Calder & Roy L. Taylor -- not accepted -- Bolander's water-starwort
  Callitriche heterophylla ssp. heterophylla Pursh -- not accepted -- twoheaded water-starwort, greater waterstarwort, twoheaded waterstarwort
  Callitriche heterophylla var. bolanderi (Hegelm.) Fassett -- accepted -- Bolander's water-starwort
  Callitriche heterophylla var. heterophylla Pursh -- accepted -- twoheaded water-starwort
  Callitriche intermedia Hoffm. -- not accepted -- narrowleaf water-starwort, narrowleaf waterstarwort
  Callitriche intermedia ssp. hamulata (Kütz. ex W.D.J. Koch) Clapham -- not accepted -- narrowleaf water-starwort, narrowleaf waterstarwort
  Callitriche intermedia ssp. intermedia Hoffm. -- not accepted -- narrowleaf water-starwort, narrowleaf waterstarwort
  Callitriche longipedunculata Morong -- accepted -- longstock water-starwort
  Callitriche marginata Torr. -- accepted -- winged water-starwort
  Callitriche nuttallii Torr. -- not accepted -- Nuttall's waterstarwort
  Callitriche palustris L. -- accepted -- vernal water-starwort, spring waterstarwort, spiny waterstarwort, vernal waterstarwort
  Callitriche palustris var. verna (L.) Fenley ex Jeps. -- not accepted
  Callitriche pedunculosa Nutt. -- accepted -- Nuttall's water-starwort
  Callitriche peploides Nutt. -- accepted -- matted waterstarwort, matted water-starwort
  Callitriche peploides var. peploides Nutt. -- accepted
  Callitriche peploides var. semialata Fassett -- accepted
  Callitriche sepulta S. Watson -- not accepted
  Callitriche stagnalis Scop. -- accepted -- pond water-starwort
  Callitriche stenoptera Lansdown -- accepted
  Callitriche terrestris Raf. -- accepted -- terrestrial water-starwort, terrestrial waterstarwort
  Callitriche trochlearis Fassett -- accepted -- effluent water-starwort
  Callitriche verna L. -- not accepted
  Calophanes angusta A. Gray -- not accepted
  Calophanes decumbens A. Gray -- not accepted
  Calophanes humistrata (Michx.) Shuttlw. ex Nees -- not accepted
  Calophanes linearis (Torr. & A. Gray) A. Gray -- not accepted
  Calpidisca standleyae Barnhart -- not accepted
  Campsis Lour. -- accepted
  Campsis radicans (L.) Seem. ex Bureau -- accepted -- common trumpetcreeper, cow-itch, trumpet creeper
  Capraria L. -- accepted
  Capraria biflora L. -- accepted -- goatweed
  Capraria crustacea L. -- not accepted
  Capraria durantifolia L. -- not accepted
  Capraria mexicana Moric. ex Benth. -- accepted -- Tamaulipan tea
  Carlowrightia A. Gray -- accepted -- wrightwort
  Carlowrightia arizonica A. Gray -- accepted -- Arizona carlowrightia, Arizona wrightwort
  Carlowrightia linearifolia (Torr.) A. Gray -- accepted -- heath wrightwort
  Carlowrightia mexicana Henrickson & T.F. Daniel -- accepted -- Mexican wrightwort
  Carlowrightia parviflora (Buckley) Wassh. -- accepted -- smallflower wrightwort
  Carlowrightia parvifolia Brandegee -- accepted -- littleleaf wrightwort
  Carlowrightia pubens A. Gray -- not accepted
  Carlowrightia serpyllifolia A. Gray -- accepted -- Trans-Pecos wrightwort
  Carlowrightia texana Henrickson & T.F. Daniel -- accepted -- Texas wrightwort
  Carlowrightia torreyana Wassh. -- accepted -- Torrey's wrightwort
  Caryopteris Bunge -- accepted
  Caryopteris X clandonensis hort. ex Rehder -- accepted -- caryopteris
  Castilleja Mutis ex L. f. -- accepted -- castilléjie, Indian paintbrush
  Castilleja acuminata auct. non (Pursh) Spreng. -- not accepted
  Castilleja affinis Hook. & Arn. -- accepted -- coast Indian paintbrush
  Castilleja affinis ssp. affinis Hook. & Arn. -- accepted -- coast Indian paintbrush
  Castilleja affinis ssp. insularis (Eastw.) Munz -- not accepted
  Castilleja affinis ssp. litoralis (Pennell) T.I. Chuang & Heckard -- accepted -- coast Indian paintbrush
  Castilleja affinis ssp. neglecta (Zeile) T.I. Chuang & Heckard -- accepted -- Tiburon Indian paintbrush, Tiburon paintbrush
  Castilleja affinis var. contentiosa (J.F. Macbr.) Bacig. -- not accepted
  Castilleja ambigua Hook. & Arn. -- accepted -- johnny-nip
  Castilleja ambigua ssp. ambigua Hook. & Arn. -- accepted -- johnny-nip
  Castilleja ambigua ssp. humboldtiensis (D.D. Keck) T.I. Chuang & Heckard -- accepted -- Humboldt Bay owl's clover
  Castilleja ambigua ssp. insalutata (Jeps.) T.I. Chuang & Heckard -- accepted -- johnny-nip
  Castilleja angustifolia (Nutt.) G. Don -- accepted -- northwestern paintbrush, northwestern Indian paintbrush
  Castilleja angustifolia var. angustifolia (Nutt.) G. Don -- accepted -- northwestern Indian paintbrush
  Castilleja angustifolia var. bradburii (Nutt.) Fernald -- not accepted
  Castilleja angustifolia var. dubia A. Nelson -- accepted
  Castilleja angustifolia var. flavescens (Pennell ex Edwin) N.H. Holmgren -- accepted -- northwestern Indian paintbrush, northwestern paintbrush
  Castilleja angustifolia var. hispida (Benth.) Fernald -- not accepted
  Castilleja angustifolia var. whitedii Piper -- not accepted
  Castilleja annua Pennell -- accepted -- Fairbanks annual Indian paintbrush
  Castilleja applegatei Fernald -- accepted -- pine Indian paintbrush, wavyleaf paintbrush, wavyleaf Indian paintbrush
  Castilleja applegatei ssp. applegatei Fernald -- accepted -- wavyleaf Indian paintbrush
  Castilleja applegatei ssp. disticha (Eastw.) T.I. Chuang & Heckard -- accepted -- wavyleaf Indian paintbrush
  Castilleja applegatei ssp. martinii (Abrams) T.I. Chuang & Heckard -- accepted -- wavyleaf Indian paintbrush, desert Indian paintbrush, Martin's paintbrush
  Castilleja applegatei ssp. pallida (Eastw.) T.I. Chuang & Heckard -- accepted -- wavyleaf Indian paintbrush
  Castilleja applegatei ssp. pinetorum (Fernald) T.I. Chuang & Heckard -- accepted -- wavyleaf Indian paintbrush
  Castilleja applegatei var. applegatei Fernald -- not accepted -- Applegate's Indian paintbrush
  Castilleja applegatei var. breweri (Fernald) N.H. Holmgren -- not accepted
  Castilleja applegatei var. fragilis (Zeile) N.H. Holmgren -- not accepted
  Castilleja applegatei var. pallida (Eastw.) N.H. Holmgren -- not accepted
  Castilleja applegatei var. pinetorum (Fernald) N.H. Holmgren -- not accepted
  Castilleja applegatei var. viscida (Rydb.) Ownbey -- not accepted
  Castilleja aquariensis N.H. Holmgren -- accepted -- Aquarius Plateau Indian paintbrush, Aquarius paintbrush
  Castilleja arachnoidea Greenm. -- accepted -- cobweb paintbrush, cobwebby Indian paintbrush
  Castilleja arachnoidea ssp. arachnoidea Greenm. -- not accepted -- cobwebby Indian paintbrush
  Castilleja arachnoidea ssp. schizotricha (Greenm.) Pennell -- not accepted
  Castilleja arachnoidea ssp. shastensis (Eastw.) Pennell -- not accepted
  Castilleja arvensis Cham. & Schltdl. -- accepted -- field Indian paintbrush
  Castilleja attenuata (A. Gray) T.I. Chuang & Heckard -- accepted -- Indian paintbrush, attenuate Indian paintbrush
  Castilleja austromontana Standl. & Blumer -- accepted -- Rincon Indian paintbrush, Rincon Mountain Indian paintbrush
  Castilleja barnebyana Eastw. -- not accepted
  Castilleja brevilobata Piper -- not accepted -- short-lobed red paintbrush
  Castilleja brevistyla (Hoover) T.I. Chuang & Heckard -- accepted -- shortstyle Indian paintbrush
  Castilleja breweri Fernald -- not accepted
  Castilleja breweri var. pallida Eastw. -- not accepted
  Castilleja calcicola Pennell ex Edwin -- not accepted
  Castilleja californica Abrams -- not accepted
  Castilleja campestris (Benth.) T.I. Chuang & Heckard -- accepted -- vernal pool Indian paintbrush
  Castilleja campestris ssp. campestris (Benth.) T.I. Chuang & Heckard -- accepted -- vernal pool Indian paintbrush
  Castilleja campestris ssp. succulenta (Hoover) T.I. Chuang & Heckard -- accepted -- succulent owl's-clover, fleshy owl's-clover
  Castilleja caudata (Pennell) Rebrist. -- accepted -- Port Clarence Indian paintbrush
  Castilleja caudata var. auricoma (Pennell) Hultén -- accepted -- Port Clarence Indian paintbrush
  Castilleja caudata var. caudata (Pennell) Rebrist. -- accepted -- Port Clarence Indian paintbrush
  Castilleja cervina Greenm. -- accepted -- deer Indian paintbrush
  Castilleja chambersii M. Egger & Meinke -- accepted -- Chambers' paintbrush
  Castilleja chlorotica Piper -- accepted -- green-tinged paintbrush, greentinge Indian paintbrush
  Castilleja christii N.H. Holmgren -- accepted -- Christ's Indian paintbrush
  Castilleja chromosa A. Nelson -- not accepted
  Castilleja chrymactis Pennell -- accepted -- green Indian paintbrush
  Castilleja chrysantha Greenm. -- accepted -- yellow Wallowa Indian paintbrush
  Castilleja ciliata Pennell -- not accepted
  Castilleja cinerea A. Gray -- accepted -- ash-gray Indian paintbrush
  Castilleja citrina Pennell -- not accepted
  Castilleja clokeyi Pennell -- not accepted
  Castilleja coccinea (L.) Spreng. -- accepted -- Indian paintbrush, scarlet Indian paintbrush
  Castilleja confusa Greene -- not accepted
  Castilleja covilleana L.F. Hend. -- accepted -- Coville's Indian paintbrush
  Castilleja crista-galli Rydb. -- accepted -- mountainside Indian paintbrush
  Castilleja cruenta Standl. -- not accepted
  Castilleja cryptantha Pennell & G.N. Jones -- accepted -- obscure Indian paintbrush
  Castilleja culbertsonii Greene -- not accepted -- Culbertson Indian paintbrush
  Castilleja cusickii Greenm. -- accepted -- Cusick's paintbrush, Cusick's Indian paintbrush
  Castilleja densiflora (Benth.) T.I. Chuang & Heckard -- accepted -- denseflower Indian paintbrush
  Castilleja densiflora ssp. densiflora (Benth.) T.I. Chuang & Heckard -- accepted -- denseflower Indian paintbrush
  Castilleja densiflora ssp. gracilis (Benth.) T.I. Chuang & Heckard -- accepted -- denseflower Indian paintbrush
  Castilleja densiflora ssp. obispoensis (D.D. Keck) T.I. Chuang & Heckard -- accepted -- Obispo Indian paintbrush
  Castilleja dissitiflora N.H. Holmgren -- accepted -- Mount Hamilton paintbrush, Mt. Hamilton Indian paintbrush
  Castilleja disticha Eastw. -- not accepted
  Castilleja dixonii Fernald -- not accepted
  Castilleja douglasii Benth. -- not accepted
  Castilleja douglasii ssp. insularis (Eastw.) Pennell -- not accepted
  Castilleja elata Piper -- not accepted
  Castilleja elegans Malte -- accepted -- elegant Indian paintbrush
  Castilleja elkoensis Edwin -- not accepted
  Castilleja elmeri Fernald -- accepted -- Wenatchee Indian paintbrush
  Castilleja elongata Pennell -- not accepted -- tall paintbrush
  Castilleja ewanii Eastw. -- not accepted
  Castilleja exilis A. Nelson -- not accepted
  Castilleja exserta (A. Heller) T.I. Chuang & Heckard -- accepted -- Indian paintbrush, exserted Indian paintbrush
  Castilleja exserta ssp. exserta (A. Heller) T.I. Chuang & Heckard -- accepted -- exserted Indian paintbrush, owl clover
  Castilleja exserta ssp. latifolia (S. Watson) T.I. Chuang & Heckard -- accepted -- wideleaf Indian paintbrush
  Castilleja exserta ssp. venusta (A. Heller) T.I. Chuang & Heckard -- accepted -- exserted Indian paintbrush
  Castilleja filifolia Eastw. -- not accepted
  Castilleja flava S. Watson -- accepted -- yellow paintbrush, yellow Indian paintbrush
  Castilleja flava var. flava S. Watson -- accepted -- yellow Indian paintbrush
  Castilleja flava var. rustica (Piper) N.H. Holmgren -- accepted -- country Indian paintbrush
  Castilleja flavescens Pennell ex Edwin -- not accepted
  Castilleja foliolosa Hook. & Arn. -- accepted -- Texas Indian paintbrush
  Castilleja franciscana Pennell -- not accepted
  Castilleja fraterna Greenm. -- accepted -- fraternal Indian paintbrush
  Castilleja fulva Pennell -- accepted -- Elko Indian paintbrush
  Castilleja genevievana G.L. Nesom -- accepted -- Genevieve's Indian paintbrush
  Castilleja glandulifera Pennell -- accepted -- gland Indian paintbrush
  Castilleja glandulifera ssp. pallida (Eastw.) Pennell -- not accepted
  Castilleja gleasoni Elmer -- not accepted
  Castilleja gracillima Rydb. -- not accepted
  Castilleja grisea Dunkle -- accepted -- San Clemente Island Indian paintbrush
  Castilleja gyroloba Pennell -- not accepted
  Castilleja haydenii (A. Gray) Cockerell -- accepted -- Hayden's Indian paintbrush
  Castilleja henryae Pennell -- not accepted
  Castilleja hispida Benth. -- accepted -- harsh Indian paintbrush
  Castilleja hispida ssp. abbreviata (Fernald) Pennell -- not accepted
  Castilleja hispida ssp. acuta Pennell -- accepted -- acute Indian paintbrush
  Castilleja hispida ssp. brevilobata (Piper) T.I. Chuang & Heckard -- accepted -- short-lobe Indian paintbrush
  Castilleja hispida ssp. hispida Benth. -- accepted -- harsh Indian paintbrush
  Castilleja hispida var. acuta (Pennell) Ownbey -- not accepted
  Castilleja hololeuca Greene -- not accepted -- white-felted paintbrush
  Castilleja hololeuca ssp. grisea (Dunkle) Munz -- not accepted
  Castilleja hyetophila Pennell -- accepted -- coastal red Indian paintbrush
  Castilleja hyperborea Pennell -- accepted -- northern Indian paintbrush
  Castilleja inconstans Standl. -- not accepted
  Castilleja indivisa Engelm. -- accepted -- Texas paintbrush, entireleaf Indian paintbrush
  Castilleja inflata Pennell -- not accepted
  Castilleja integra A. Gray -- accepted -- squawfeather, wholeleaf Indian paintbrush
  Castilleja integra var. gloriosa (Britton) Cockerell -- accepted -- wholeleaf Indian paintbrush, squawfeather
  Castilleja integra var. integra A. Gray -- accepted -- wholeleaf Indian paintbrush
  Castilleja inverta (A. Nelson & J.F. Macbr.) Pennell & Ownbey -- not accepted
  Castilleja jepsonii Bacig. & Heckard -- not accepted
  Castilleja kaibabensis N.H. Holmgren -- accepted -- Kaibab Indian paintbrush, Kaibab Plateau Indian paintbrush, Kaibab paintbrush
  Castilleja kraliana J.R. Allison -- accepted -- Cahaba Indian paintbrush
  Castilleja kuschei Eastw. -- accepted -- Kusche's Indian paintbrush
  Castilleja labiata Pennell -- not accepted
  Castilleja lacera (Benth.) T.I. Chuang & Heckard -- accepted -- cutleaf Indian paintbrush
  Castilleja lanata A. Gray -- accepted -- Sierran woolly Indian paintbrush, woolly paintbrush, Sierra woolly Indian paintbrush
  Castilleja lanata ssp. hololeuca (Greene) T.I. Chuang & Heckard -- accepted -- whitefelt Indian paintbrush
  Castilleja lanata ssp. lanata A. Gray -- accepted -- Sierra woolly Indian paintbrush
  Castilleja lapidicola A. Heller -- not accepted
  Castilleja lasiorhyncha (A. Gray) T.I. Chuang & Heckard -- accepted -- San Bernardino Mountains Indian paintbrush, San Bernardino Mountains orthocarpus
  Castilleja lassenensis Eastw. -- not accepted -- Lemmon's Indian paintbrush
  Castilleja latebracteata Pennell -- not accepted
  Castilleja latifolia Hook. & Arn. -- accepted -- Monterey Indian paintbrush
  Castilleja latifolia ssp. mendocinensis Eastw. -- not accepted
  Castilleja lauta A. Nelson -- not accepted
  Castilleja laxa A. Gray -- not accepted
  Castilleja lemmonii A. Gray -- accepted -- Lemmon's paintbrush, Lemmon's Indian paintbrush
  Castilleja leonardii Rydb. -- not accepted
  Castilleja leschkeana J.T. Howell -- not accepted -- Point Reyes paintbrush
  Castilleja levisecta Greenm. -- accepted -- golden paintbrush, golden Indian paintbrush
  Castilleja linariifolia Benth. -- accepted -- Wyoming paintbrush, Wyoming Indian paintbrush
  Castilleja linariifolia var. omnipubescens (Pennell) Clokey -- not accepted
  Castilleja lineariiloba (Benth.) T.I. Chuang & Heckard -- accepted -- sagebrush Indian paintbrush
  Castilleja linearis Rydb. -- not accepted
  Castilleja lineata Greene -- accepted -- marsh-meadow Indian paintbrush, marshmeadow Indian paintbrush
  Castilleja linoides A. Gray -- not accepted
  Castilleja litoralis Pennell -- not accepted
  Castilleja longispica A. Nelson -- not accepted
  Castilleja ludoviciana Pennell -- not accepted -- Jeff Davis Parish Indian paintbrush
  Castilleja lutea A. Heller -- not accepted
  Castilleja luteovirens Rydb. -- not accepted
  Castilleja lutescens (Greenm.) Rydb. -- accepted -- stiff yellow Indian paintbrush
  Castilleja magnistylis Edwin -- not accepted
  Castilleja martinii Abrams -- not accepted
  Castilleja martinii ssp. ewanii (Eastw.) Munz -- not accepted -- Ewan's Indian paintbrush
  Castilleja martinii var. clokeyi (Pennell) N.H. Holmgren -- not accepted
  Castilleja martinii var. ewanii (Eastw.) N.H. Holmgren -- not accepted
  Castilleja martinii var. martinii Abrams -- not accepted -- Martin's Indian paintbrush
  Castilleja mearnsii Pennell -- not accepted
  Castilleja mendocinensis (Eastw.) Pennell -- accepted -- Mendocino Coast Indian paintbrush, Mendocino coast paintbrush
  Castilleja mexicana (Hemsl.) A. Gray -- accepted -- Mexican Indian paintbrush
  Castilleja miniata Douglas ex Hook. -- accepted -- great red Indian paintbrush, great red Indian-paintbrush, scarlet Indian paintbrush, scarlet paintbrush, giant red Indian paintbrush
  Castilleja miniata ssp. dixonii (Fernald) Kartesz -- accepted -- giant red Indian paintbrush
  Castilleja miniata ssp. elata (Piper) Munz -- accepted -- Siskiyou Indian paintbrush
  Castilleja miniata ssp. miniata Douglas ex Hook. -- accepted -- giant red Indian paintbrush
  Castilleja miniata var. dixonii (Fernald) A. Nelson & J.F. Macbr. -- not accepted
  Castilleja miniata var. miniata Douglas ex Hook. -- not accepted -- green Indian paintbrush
  Castilleja minor (A. Gray) A. Gray -- accepted -- lesser Indian paintbrush, alkali Indian paintbrush
  Castilleja minor ssp. minor (A. Gray) A. Gray -- accepted -- lesser Indian paintbrush, small annual Indian paintbrush, small Indian paintbrush, smallflower paintbrush
  Castilleja minor ssp. spiralis (Jeps.) T.I. Chuang & Heckard -- accepted -- annual Indian paintbrush, lesser Indian paintbrush
  Castilleja mogollonica Pennell -- not accepted -- White Mountains paintbrush
  Castilleja mollis Pennell -- accepted -- softleaf Indian paintbrush, soft-leaved paintbrush, soft-leaved Indian paintbrush
  Castilleja montigena Heckard -- accepted -- Heckard's Indian paintbrush
  Castilleja muelleri Pennell -- not accepted -- Kluane Lake Indian paintbrush
  Castilleja nana Eastw. -- accepted -- dwarf alpine paintbrush, dwarf alpine Indian paintbrush
  Castilleja neglecta Zeile -- not accepted
  Castilleja nervata Eastw. -- accepted -- Trans-Pecos Indian paintbrush
  Castilleja nivea Pennell & Ownbey -- accepted -- snow Indian paintbrush
  Castilleja oblongifolia A. Gray -- not accepted
  Castilleja occidentalis Torr. -- accepted -- western Indian paintbrush
  Castilleja oregonensis Gand. -- not accepted
  Castilleja oreopola Greenm. -- not accepted
  Castilleja oreopola ssp. albida Pennell -- not accepted
  Castilleja oresbia Greenm. -- accepted -- pale Wallowa Indian paintbrush
  Castilleja organorum Standl. -- accepted -- Organ Mountain Indian paintbrush
  Castilleja ornata Eastw. -- accepted -- glowing Indian paintbrush
  Castilleja ownbeyana Pennell -- not accepted -- common Wallowa paintbrush
  Castilleja pallescens (A. Gray) Greenm. -- accepted -- pale paintbrush, pale Indian paintbrush
  Castilleja pallescens var. inverta (A. Nelson & J.F. Macbr.) Edwin -- accepted -- pale Indian paintbrush
  Castilleja pallescens var. pallescens (A. Gray) Greenm. -- accepted -- pale Indian paintbrush
  Castilleja pallida (L.) Kunth -- accepted -- boreal Indian paintbrush
  Castilleja pallida ssp. caudata Pennell -- not accepted
  Castilleja pallida ssp. elegans (Malte) Pennell -- not accepted
  Castilleja pallida ssp. septentrionalis (Lindl.) Scoggan -- not accepted
  Castilleja pallida var. caudata (Pennell) B. Boivin -- not accepted
  Castilleja pallida var. elegans (Malte) B. Boivin -- not accepted
  Castilleja pallida var. septentrionalis (Lindl.) A. Gray -- not accepted
  Castilleja parviflora Bong. -- accepted -- mountain Indian paintbrush
  Castilleja parviflora var. albida (Pennell) Ownbey -- accepted -- smallflower Indian paintbrush
  Castilleja parviflora var. olympica (G.N. Jones) Ownbey -- accepted -- Olympic Indian paintbrush
  Castilleja parviflora var. oreopola (Greenm.) Ownbey -- accepted -- Henry Indian paintbrush
  Castilleja parviflora var. parviflora Bong. -- accepted -- smallflower Indian paintbrush
  Castilleja parvula Rydb. -- accepted -- Tushar Plateau Indian paintbrush, Tushar Indian paintbrush
  Castilleja parvula var. revealii (N.H. Holmgren) N.D. Atwood -- not accepted
  Castilleja patriotica Fernald -- accepted -- Huachuca Indian paintbrush, Huachuca Mountain Indian paintbrush
  Castilleja patriotica var. blumeri (Standl.) Kearney & Peebles -- not accepted
  Castilleja payneae Eastw. -- not accepted
  Castilleja peckiana Pennell -- accepted -- Peck's Indian paintbrush, peakpaintbrush
  Castilleja peirsonii Eastw. -- not accepted
  Castilleja pilosa (S. Watson) Rydb. -- accepted -- parrothead Indian paintbrush, hairy paintbrush
  Castilleja pilosa ssp. jusselii (Eastw.) Munz -- not accepted
  Castilleja pilosa var. inverta (A. Nelson & J.F. Macbr.) A. Nelson & J.F. Macbr. -- not accepted
  Castilleja pilosa var. longispica (A. Nelson) N.H. Holmgren -- accepted -- longspike Indian paintbrush
  Castilleja pilosa var. pilosa (S. Watson) Rydb. -- accepted -- parrothead Indian paintbrush
  Castilleja pilosa var. steenensis (Pennell) N.H. Holmgren -- accepted -- Steenes Indian paintbrush, Steen's mountain paintbrush
  Castilleja pinetorum Fernald -- not accepted
  Castilleja plagiotoma A. Gray -- accepted -- Mojave Indian paintbrush
  Castilleja praeterita Heckard & Bacig. -- accepted -- Salmon Creek Indian paintbrush
  Castilleja pruinosa Fernald -- accepted -- frosted Indian paintbrush
  Castilleja pruinosa ssp. gleasoni (Elmer) Munz -- not accepted
  Castilleja psittacina (Eastw.) Pennell -- not accepted
  Castilleja puberula Rydb. -- accepted -- shortflower Indian paintbrush
  Castilleja pulchella Rydb. -- accepted -- beautiful Indian paintbrush
  Castilleja purpurea (Nutt.) G. Don -- accepted -- Indian paintbrush, downy Indian paintbrush
  Castilleja purpurea var. citrina (Pennell) Shinners -- accepted -- prairie Indian paintbrush, citron paintbrush
  Castilleja purpurea var. lindheimeri (A. Gray) Shinners -- accepted -- Lindheimer's Indian paintbrush
  Castilleja purpurea var. purpurea (Nutt.) G. Don -- accepted -- downy Indian paintbrush
  Castilleja pyramidalis Edwin -- not accepted
  Castilleja raupii Pennell -- accepted -- Raup's Indian paintbrush, castilléjie de Raup
  Castilleja revealii N.H. Holmgren -- accepted -- Bryce Canyon Indian paintbrush
  Castilleja rhexiifolia Rydb. -- accepted -- splitleaf Indian paintbrush, rhexialeaf paintbrush
  Castilleja rhexiifolia var. sulphurea (Rydb.) N.D. Atwood -- not accepted
  Castilleja rigida Eastw. -- accepted -- rigid Indian paintbrush
  Castilleja roseana Eastw. -- not accepted
  Castilleja rubicundula (Jeps.) T.I. Chuang & Heckard -- accepted -- cream sacs
  Castilleja rubicundula ssp. lithospermoides (Benth.) T.I. Chuang & Heckard -- accepted -- cream sacs
  Castilleja rubicundula ssp. rubicundula (Jeps.) T.I. Chuang & Heckard -- accepted -- cream sacs
  Castilleja rubida Piper -- accepted -- little reddish Indian paintbrush
  Castilleja rubida var. monoensis (Jeps.) Edwin -- not accepted
  Castilleja rupicola Piper ex Fernald -- accepted -- cliff Indian paintbrush
  Castilleja rustica Piper -- not accepted
  Castilleja salsuginosa N.H. Holmgren -- accepted -- Monte Neva Indian paintbrush, Monte Neva paintbrush
  Castilleja scabrida Eastw. -- accepted -- rough paintbrush, rough Indian paintbrush
  Castilleja scabrida var. barnebyana (Eastw.) N.H. Holmgren -- accepted -- Barneby's Indian paintbrush
  Castilleja scabrida var. scabrida Eastw. -- accepted -- Zion Indian paintbrush
  Castilleja schizotricha Greenm. -- accepted -- splithair Indian paintbrush
  Castilleja septentrionalis Lindl. -- accepted -- Labrador Indian paintbrush
  Castilleja sessiliflora Pursh -- accepted -- downy paintedcup, Great Plains Indian paintbrush, Indian paintbrush
  Castilleja setosa Pennell -- accepted
  Castilleja spiralis Jeps. -- not accepted
  Castilleja steenensis Pennell -- not accepted
  Castilleja stenantha A. Gray -- not accepted
  Castilleja stenantha ssp. spiralis (Jeps.) Munz -- not accepted
  Castilleja subinclusa Greene -- accepted -- longleaf Indian paintbrush
  Castilleja subinclusa ssp. franciscana (Pennell) T.I. Chuang & Heckard -- accepted -- longleaf Indian paintbrush
  Castilleja subinclusa ssp. subinclusa Greene -- accepted -- longleaf Indian paintbrush
  Castilleja subinclusa var. franciscana (Pennell) G.L. Nesom -- not accepted
  Castilleja suksdorfii A. Gray -- accepted -- Suksdorf's Indian paintbrush
  Castilleja sulphurea Rydb. -- accepted -- sulphur Indian paintbrush
  Castilleja taedifera Pennell -- not accepted
  Castilleja tenuiflora Benth. -- accepted -- Santa Catalina Indian paintbrush, Catalina Indian paintbrush
  Castilleja tenuis (A. Heller) T.I. Chuang & Heckard -- accepted -- hairy Indian paintbrush, slender paintbrush
  Castilleja thompsonii Pennell -- accepted -- Thompson's Indian paintbrush
  Castilleja tortifolia Pennell -- not accepted
  Castilleja trainii Edwin -- not accepted
  Castilleja uliginosa Eastw. -- not accepted -- Pitkin Marsh paintbrush
  Castilleja unalaschcensis (Cham. & Schltdl.) Malte -- accepted -- Alaska Indian paintbrush
  Castilleja villicaulis Pennell & Ownbey -- not accepted
  Castilleja villosissima Pennell -- not accepted
  Castilleja viscida Rydb. -- not accepted
  Castilleja viscidula A. Gray -- accepted -- sticky Indian paintbrush, sticky paintbrush
  Castilleja wallowensis Pennell -- accepted -- Wallowa Indian paintbrush
  Castilleja wherryana Pennell -- not accepted
  Castilleja wightii Elmer -- not accepted
  Castilleja wightii ssp. anacapensis (Dunkle) Pennell -- not accepted
  Castilleja wightii ssp. inflata (Pennell) Munz -- not accepted
  Castilleja wightii ssp. litoralis (Pennell) Munz -- not accepted
  Castilleja wightii ssp. rubra Pennell -- not accepted
  Castilleja wightii ssp. wightii Elmer -- not accepted -- Wight's Indian paintbrush
  Castilleja williamsii Pennell -- not accepted
  Castilleja wootonii Standl. -- accepted -- Sacramento Mountain Indian paintbrush
  Castilleja X porterae Cockerell -- accepted -- Porter's Indian paintbrush
  Castilleja xanthotricha Pennell -- accepted -- yellowhair Indian paintbrush
  Castilleja yukonis Pennell -- accepted -- Yukon Indian paintbrush
  Castilleja zionis Eastw. -- not accepted
  Catalpa Scop. -- accepted
  Catalpa bignonioides Walter -- accepted -- southern catalpa
  Catalpa bungei C.A. Mey. -- accepted
  Catalpa catalpa (L.) H. Karst. -- not accepted
  Catalpa fargesii Bureau -- accepted
  Catalpa longissima (Jacq.) Dum. Cours. -- accepted -- Haitian catalpa
  Catalpa ovata G. Don -- accepted -- Chinese catalpa
  Catalpa speciosa (Warder) Warder ex Engelm. -- accepted -- northern catalpa
  Cedronella Moench -- accepted
  Cedronella canariensis (L.) Willd. ex Webb & Berthel. -- accepted -- herb of Gilead
  Cedronella micrantha A. Gray -- not accepted
  Ceranthera densiflora (Benth.) A. Gray -- not accepted
  Ceranthera linearifolia Elliott -- not accepted
  Ceratophytum Pittier -- accepted
  Ceratophytum brachycarpum Pittier -- not accepted
  Ceratophytum tobagense (Urb.) Sprague & Sandwith -- accepted
  Ceratotheca Endl. -- accepted
  Ceratotheca sesamoides Endl. -- accepted -- false sesame
  Ceratotheca triloba (Bernh.) E. Mey. ex Hook. f. -- accepted -- wild foxglove
  Chaenarrhinum (DC.) Rchb. -- not accepted
  Chaenarrhinum minus (L.) Lange -- not accepted
  Chaenorhinum (DC.) Rchb. -- accepted -- dwarf snapdragon
  Chaenorhinum calycinum (Banks & Sol.) P.H. Davis -- accepted
  Chaenorhinum minus (L.) Lange -- accepted -- dwarf-snapdragon, dwarf snapdragon
  Chaenorhinum minus ssp. minus (L.) Lange -- accepted -- dwarf snapdragon
  Chaenorrhinum (DC.) Rchb. -- not accepted
  Chaiturus Willd. -- accepted -- lion's tail
  Chaiturus marrubiastrum (L.) Rchb. -- accepted -- lion's tail
  Chelone L. -- accepted -- turtlehead
  Chelone chlorantha Pennell & Wherry -- not accepted
  Chelone cuthbertii Small -- accepted -- Cuthbert's turtlehead
  Chelone glabra L. -- accepted -- white turtlehead
  Chelone glabra var. chlorantha (Pennell & Wherry) Cooperr. -- not accepted
  Chelone glabra var. dilatata Fernald & Wiegand -- not accepted
  Chelone glabra var. elatior Raf. -- not accepted
  Chelone glabra var. elongata Pennell & Wherry -- not accepted
  Chelone glabra var. glabra L. -- not accepted -- white turtlehead
  Chelone glabra var. linifolia N. Coleman -- not accepted
  Chelone glabra var. ochroleuca Pennell & Wherry -- not accepted
  Chelone glabra var. typica Pennell -- not accepted
  Chelone grimesii Weath. -- not accepted
  Chelone lyonii Pursh -- accepted -- pink turtlehead
  Chelone montana (Raf.) Pennell & Wherry -- not accepted
  Chelone obliqua L. -- accepted -- red turtlehead
  Chelone obliqua var. erwiniae Pennell & Wherry -- accepted -- Erwin's red turtlehead
  Chelone obliqua var. obliqua L. -- accepted -- red turtlehead
  Chelone obliqua var. speciosa Pennell & Wherry -- accepted -- red turtlehead
  Chilianthus oleaceus Burch. -- not accepted
  Chilopsis D. Don -- accepted -- desert willow
  Chilopsis linearis (Cav.) Sweet -- accepted -- desert willow
  Chilopsis linearis ssp. arcuata (Fosberg) Henrickson -- accepted -- hairy clematis, desert willow
  Chilopsis linearis ssp. linearis (Cav.) Sweet -- accepted -- desert willow
  Chilopsis linearis var. arcuata Fosberg -- not accepted
  Chilopsis linearis var. glutinosa (Engelm.) Fosberg -- not accepted
  Chilopsis linearis var. originaria Fosberg -- not accepted
  Chionanthus L. -- accepted -- fringetree
  Chionanthus axilliflorus (Griseb.) Stearn -- accepted -- hueso
  Chionanthus caribaeus Jacq. -- not accepted
  Chionanthus compactus Sw. -- accepted -- bridgotree
  Chionanthus domingensis Lam. -- accepted -- white rosewood
  Chionanthus holdridgei (Camp & Monach.) Stearn -- accepted -- hueso prieto
  Chionanthus ligustrinus (Sw.) Pers. -- accepted -- cabra blanca
  Chionanthus pygmaeus Small -- accepted -- pygmy fringe-tree, pygmy fringetree
  Chionanthus virginicus L. -- accepted -- fringetree, white fringetree
  Chionanthus virginicus var. maritimus Pursh -- not accepted -- white fringetree
  Chionanthus virginicus var. virginicus L. -- not accepted -- white fringetree
  Chionophila Benth. -- accepted -- snowlover
  Chionophila jamesii Benth. -- accepted -- Rocky Mountain snowlover
  Chionophila tweedyi (Canby & Rose) L.F. Hend. -- accepted -- Tweedy's snowlover
  Chloropyron Behr -- accepted
  Chloropyron maritimum (Nutt. ex Benth.) A. Heller -- accepted -- saltmarsh bird's-beak
  Chloropyron maritimum ssp. canescens (A. Gray) Tank & J.M. Egger -- accepted -- Pt. Reyes bird's-beak
  Chloropyron maritimum ssp. maritimus Nutt. ex Benth. -- accepted -- saltmarsh bird's-beak
  Chloropyron maritimum ssp. palustre (Behr) Tank & J.M. Egger -- accepted -- Pt. Reyes bird's-beak
  Chloropyron molle (A. Gray) A. Heller -- accepted -- soft bird's-beak
  Chloropyron molle ssp. hispidum (Pennell) Tank & J.M. Egger -- accepted -- hispid bird's-beak
  Chloropyron molle ssp. molle (A. Gray) A. Heller -- accepted -- soft bird's-beak
  Chloropyron palmatum (Ferris) Tank & J.M. Egger -- accepted -- palmbract bird's-beak
  Chloropyron tecopense (Munz & J.C. Roos) Tank & J.M. Egger -- accepted -- Tecopa bird's beak
  Chrysothemis Decne. -- accepted
  Chrysothemis pulchella (Donn ex Sims) Decne. -- accepted -- squarestem
  Citharexylum L. -- accepted -- fiddlewood
  Citharexylum berlandieri B.L. Rob. -- accepted -- Berlandier's fiddlewood
  Citharexylum brachyanthum (A. Gray) A. Gray -- accepted -- Mexican fiddlewood, boxthorn fiddlewood
  Citharexylum caudatum L. -- accepted -- juniper berry
  Citharexylum fruticosum L. -- not accepted -- Florida fiddlewood
  Citharexylum fruticosum var. fruticosum L. -- not accepted -- Florida fiddlewood
  Citharexylum fruticosum var. smallii Moldenke -- not accepted -- Small's fiddlewood
  Citharexylum fruticosum var. subvillosum Moldenke -- not accepted
  Citharexylum fruticosum var. villosum (Jacq.) O.E. Schulz -- not accepted -- Florida fiddlewood
  Citharexylum pentandrum Vent. -- not accepted -- West Indian fiddlewood
  Citharexylum spathulatum Moldenke & Lundell -- not accepted
  Citharexylum spinosum L. -- accepted -- fiddlewood, spiny fiddlewood
  Citharexylum tristachyum Turcz. -- accepted -- threespike fiddlewood
  Citharexylum X perkinsii Moldenke -- accepted -- Perkins' fiddlewood
  Clerodendrum L. -- accepted -- glorybower
  Clerodendrum aculeatum (L.) Schltdl. -- not accepted -- haggarbush
  Clerodendrum buchananii (Roxb.) Walp. -- accepted
  Clerodendrum buchananii var. fallax (Lindl.) Bakh. -- accepted
  Clerodendrum bungei Steud. -- accepted -- strong-scented glorybower, rose glorybower
  Clerodendrum chinense (Osbeck) Mabb. -- accepted -- stickbush
  Clerodendrum foetidum Bunge -- not accepted
  Clerodendrum fragrans (Vent.) Willd. -- not accepted
  Clerodendrum fragrans var. multiplex (Sweet) Moldenke -- not accepted
  Clerodendrum glabrum E. Mey. -- accepted -- Natal glorybower
  Clerodendrum indicum (L.) Kuntze -- accepted -- Turk's turban
  Clerodendrum inerme (L.) Gaertn. -- not accepted -- embrert
  Clerodendrum japonicum (Thunb.) Sweet -- accepted -- Japanese glorybower
  Clerodendrum japonicum var. pleniflorum (Schauer) Maheshw. -- not accepted
  Clerodendrum kaempferi (Jacq.) Siebold -- not accepted -- Kaempfer's glorybower
  Clerodendrum lindleyi Decne. -- accepted -- Lindley's clerodendrum
  Clerodendrum lindleyi var. paniculatum Moldenke -- accepted -- Lindley's clerodendrum
  Clerodendrum macrostegium Schauer -- accepted -- velvetleaf glorybower
  Clerodendrum philippinum Schauer -- not accepted -- stickbush
  Clerodendrum quadriloculare (Blanco) Merr. -- accepted
  Clerodendrum speciosissimum Van Geert ex C. Morren -- accepted -- Javanese glorybower
  Clerodendrum squamatum Vahl -- not accepted
  Clerodendrum thompsoniae Balf. f. -- not accepted -- bagflower
  Clerodendrum thomsoniae Balf. -- accepted -- bagflower
  Clerodendrum trichotomum Thunb. -- accepted -- harlequin glorybower
  Clerodendrum trichotomum var. ferrugineum Nakai -- accepted -- ferruginous clerodendrum
  Clerodendrum trichotomum var. trichotomum Thunb. -- accepted
  Clerodendrum umbellatum Poir. -- accepted -- umbel clerodendrum
  Clerodendrum wallichii Merr. -- accepted -- Wallich's glorybower
  Clerodendrum X speciosum Dombrain -- accepted
  Clinopodium L. -- accepted
  Clinopodium acinos (L.) Kuntze -- accepted
  Clinopodium arkansanum (Nutt.) House -- not accepted -- limestone calamint
  Clinopodium ascendens (Jord.) Samp. -- not accepted -- ascending wild basil
  Clinopodium ashei (Weath.) Small -- accepted -- Ashe's calamint
  Clinopodium brownei (Sw.) Kuntze -- accepted -- Browne's savory
  Clinopodium chandleri (Brandegee) P.D. Cantino & Wagstaff -- accepted -- San Miguel calamint
  Clinopodium coccineum (Nutt. ex Hook.) Kuntze -- accepted -- scarlet calamint
  Clinopodium dentatum (Chapm.) Kuntze -- accepted -- Florida calamint
  Clinopodium douglasii (Benth.) Kuntze -- not accepted -- yerba buena
  Clinopodium georgianum R.M. Harper -- not accepted -- Georgia calamint
  Clinopodium glabellum (Michx.) Kuntze -- accepted -- Ozark calamint
  Clinopodium glabrum (Nutt.) Kuntze -- accepted -- limestone calamint
  Clinopodium gracile (Benth.) Kuntze -- accepted -- slender wild basil
  Clinopodium incanum L. -- not accepted
  Clinopodium macrocalyx Small -- not accepted
  Clinopodium mimuloides (Benth.) Kuntze -- accepted -- monkeyflower savory
  Clinopodium nepeta (L.) Kuntze -- accepted -- lesser calamint
  Clinopodium vimineum (L.) Kuntze -- accepted -- serpentine savory
  Clinopodium vulgare L. -- accepted -- wild basil
  Clinopodium vulgare var. neogaea (Fernald) C.F. Reed -- not accepted
  Coleus Lour. -- accepted
  Coleus amboinicus Lour. -- not accepted
  Coleus barbatus (Andrews) Benth. -- not accepted -- coleus
  Coleus blumei Benth. -- not accepted
  Coleus esculentus (N.E. Br.) G. Taylor -- not accepted
  Coleus parviflorus Benth. -- not accepted
  Coleus pumilus Blanco -- not accepted -- dwarf coleus
  Coleus rotundifolius (Poir.) A. Chev. & Perrot -- not accepted
  Coleus scutellarioides (L.) Benth. -- not accepted -- common coleus
  Coleus tuberosus (Blume) Benth. -- not accepted
  Collinsia Nutt. -- accepted -- blue-eyed Mary, blue eyed Mary
  Collinsia antonina Hardham -- not accepted
  Collinsia antonina ssp. purpurea Hardham -- not accepted
  Collinsia austromontana (Newsom) Pennell -- not accepted
  Collinsia bartsiifolia Benth. -- accepted -- white blue eyed Mary
  Collinsia bartsiifolia var. bartsiifolia Benth. -- accepted -- white blue eyed Mary
  Collinsia bartsiifolia var. davidsonii (Parish) Newsom -- accepted -- Davidson's blue eyed Mary
  Collinsia bartsiifolia var. hirsuta (Kellogg) Pennell -- accepted -- white blue eyed Mary
  Collinsia bartsiifolia var. stricta Newsom -- accepted -- white blue eyed Mary
  Collinsia bruceae M.E. Jones -- not accepted
  Collinsia callosa Parish -- accepted -- largefruit blue-eyed Mary, desertmountain blue eyed Mary
  Collinsia childii Parry ex A. Gray -- accepted -- Child's blue eyed Mary
  Collinsia concolor Greene -- accepted -- Chinese houses
  Collinsia corymbosa Herder -- accepted -- roundhead Chinese houses
  Collinsia franciscana Bioletti -- not accepted
  Collinsia grandiflora Douglas ex Lindl. -- accepted -- giant blue eyed Mary
  Collinsia grandiflora var. pusilla A. Gray -- not accepted
  Collinsia greenei A. Gray -- accepted -- Greene's blue eyed Mary
  Collinsia heterophylla Buist ex R. Grah. -- accepted -- purple Chinese houses
  Collinsia heterophylla var. austromontana (Newsom) Munz -- accepted -- purple Chinese houses
  Collinsia heterophylla var. heterophylla Buist ex R. Grah. -- accepted -- purple Chinese houses
  Collinsia linearis A. Gray -- accepted -- narrowleaf blue eyed Mary
  Collinsia multicolor Lindl. & Paxton -- accepted -- San Francisco blue eyed Mary
  Collinsia parryi A. Gray -- accepted -- Parry's blue eyed Mary
  Collinsia parviflora Lindl. -- accepted -- littleflower collinsia, small-flower blue-eyed Mary, blue-eyed Mary, smallflower blue eyed Mary, maiden blue eyed Mary
  Collinsia parviflora var. grandiflora (Lindl.) Ganders & G.R. Krause -- not accepted
  Collinsia parviflora var. parviflora Lindl. -- not accepted -- smallflower blue eyed Mary
  Collinsia parvula Rydb. -- not accepted
  Collinsia rattanii A. Gray -- accepted -- sticky blue eyed Mary
  Collinsia rattanii ssp. glandulosa (Howell) Pennell -- accepted -- sticky blue eyed Mary
  Collinsia rattanii ssp. rattanii A. Gray -- accepted -- sticky blue eyed Mary
  Collinsia rattanii var. linearis (A. Gray) Newsom -- not accepted
  Collinsia solitaria Kellogg -- not accepted
  Collinsia sparsiflora Fisch. & C.A. Mey. -- accepted -- spinster's blue eyed Mary
  Collinsia sparsiflora var. arvensis (Greene) Jeps. -- accepted -- spinster's blue eyed Mary
  Collinsia sparsiflora var. bruceae (M.E. Jones) Newsom -- accepted -- spinster's blue eyed Mary
  Collinsia sparsiflora var. collina (Jeps.) Newsom -- accepted -- spinster's blue eyed Mary
  Collinsia sparsiflora var. sparsiflora Fisch. & C.A. Mey. -- accepted -- spinster's blue eyed Mary
  Collinsia tenella (Pursh) Piper -- not accepted
  Collinsia tinctoria Hartw. ex Benth. -- accepted -- sticky Chinese houses
  Collinsia torreyi A. Gray -- accepted -- Torrey's blue-eyed Mary, Torrey's blue eyed Mary
  Collinsia torreyi var. brevicarinata Newsom -- accepted -- Torrey's blue eyed Mary
  Collinsia torreyi var. latifolia Newsom -- accepted -- Torrey's blue eyed Mary
  Collinsia torreyi var. torreyi A. Gray -- accepted -- Torrey's blue eyed Mary, Torrey's blue-eyed Mary
  Collinsia torreyi var. wrightii (S. Watson) I.M. Johnst. -- accepted -- Wright's blue eyed Mary
  Collinsia verna Nutt. -- accepted -- blue-eyed Mary, spring blue eyed Mary
  Collinsia violacea Nutt. -- accepted -- violet collensia, violet blue eyed Mary
  Collinsia wrightii S. Watson -- not accepted
  Collinsonia L. -- accepted -- horsebalm
  Collinsonia anisata Sims -- accepted -- Blue Ridge horsebalm
  Collinsonia canadensis L. -- accepted -- richweed
  Collinsonia canadensis var. punctata (Elliott) A. Gray -- not accepted
  Collinsonia punctata Elliott -- accepted -- Blue Ridge horsebalm
  Collinsonia serotina Walter -- not accepted -- Blue Ridge horsebalm
  Collinsonia tuberosa Michx. -- not accepted -- deepwoods horsebalm
  Collinsonia verticillata Baldw. -- accepted -- stoneroot
  Columnea L. -- accepted
  Columnea ambigua (Urb.) B.D. Morley -- accepted -- tibey de cresta
  Columnea scandens L. -- accepted -- tibey parasito
  Columnea scandens var. tulae (Urb.) Wiehler -- accepted -- tibey parasito
  Columnea tulae Urb. -- not accepted -- tibey parasito
  Congea Roxb. -- accepted
  Congea tomentosa Roxb. -- accepted -- lluvia de orquideas
  Conobea multifida (Michx.) Benth. -- not accepted
  Conopholis Wallr. -- accepted -- cancer-root, squawroot
  Conopholis alpina Liebm. -- accepted -- alpine squawroot, alpine cancer-root
  Conopholis alpina var. mexicana (A. Gray ex S. Watson) R.R. Haynes -- accepted -- Mexican squawroot, alpine squawroot, Mexican cancer-root
  Conopholis americana (L.) Wallr. -- accepted -- American squawroot, squaw-root, conopholis d'Amérique, American cancer-root
  Conopholis ludoviciana (Nutt.) Alph. Wood -- not accepted
  Conopholis mexicana A. Gray ex S. Watson -- not accepted
  Conradina A. Gray -- accepted -- false rosemary
  Conradina brevifolia Shinners -- not accepted -- short-leaved rosemary
  Conradina canescens (Torr. & A. Gray ex Benth.) A. Gray -- accepted -- false rosemary
  Conradina cygniflora C.E. Edwards, Judd, Ionta & Herring -- accepted
  Conradina etonia Kral & McCartney -- accepted -- Etonia rosemary, Eton rosemary
  Conradina glabra Shinners -- accepted -- Cumberland rosemary, Apalachicola rosemary, Apalachicola false rosemary
  Conradina grandiflora Small -- accepted -- largeflower false rosemary
  Conradina montana Small -- not accepted
  Conradina puberula Small -- not accepted
  Conradina verticillata Jennison -- accepted -- Cumberland rosemary, Cumberland false rosemary
  Cordylanthus Nutt. ex Benth. -- accepted -- bird's beak, bird's-beak
  Cordylanthus bernardinus Munz -- not accepted
  Cordylanthus bolanderi (A. Gray) Pennell -- not accepted
  Cordylanthus brunneus (Jeps.) Pennell -- not accepted
  Cordylanthus canescens A. Gray -- not accepted
  Cordylanthus capillaris Pennell -- not accepted
  Cordylanthus capitatus Nutt. ex Benth. -- accepted -- Yakima bird's-beak, cluster bird'sbeak
  Cordylanthus carnulosus Pennell -- not accepted
  Cordylanthus compactus Pennell -- not accepted
  Cordylanthus diffusus Pennell -- not accepted
  Cordylanthus eremicus (Coville & C.V. Morton) Munz -- accepted -- desert bird's-beak
  Cordylanthus eremicus ssp. eremicus (Coville & C.V. Morton) Munz -- accepted -- desert bird's-beak
  Cordylanthus eremicus ssp. kernensis T.I. Chuang & Heckard -- accepted -- Kern Plateau bird's-beak
  Cordylanthus ferrisianus Pennell -- not accepted
  Cordylanthus filifolius Nutt. ex Benth. -- not accepted
  Cordylanthus glandulosus Pennell & Clokey -- not accepted
  Cordylanthus hansenii (Ferris) J.F. Macbr. -- not accepted
  Cordylanthus helleri (Ferris) J.F. Macbr. -- not accepted
  Cordylanthus hispidus Pennell -- not accepted
  Cordylanthus kingii S. Watson -- accepted -- King's bird'sbeak, King's bird's-beak
  Cordylanthus kingii ssp. densiflorus T.I. Chuang & Heckard -- accepted -- King's bird's-beak
  Cordylanthus kingii ssp. helleri (Ferris) T.I. Chuang & Heckard -- accepted -- Heller's bird's beak, Heller's bird's-beak
  Cordylanthus kingii ssp. kingii S. Watson -- accepted -- King's bird'sbeak, King's bird's-beak
  Cordylanthus kingii var. densiflorus (T.I. Chuang & Heckard) N.D. Atwood -- not accepted
  Cordylanthus kingii var. helleri (Ferris) N.H. Holmgren -- not accepted
  Cordylanthus laxiflorus A. Gray -- accepted -- nodding bird's-beak, nodding bird's beak
  Cordylanthus littoralis (Ferris) J.F. Macbr. -- not accepted
  Cordylanthus littoralis ssp. platycephalus (Pennell) Munz -- not accepted
  Cordylanthus maritimus Nutt. ex Benth. -- not accepted -- saltmarsh bird'sbeak, saltmarsh bird's-beak
  Cordylanthus maritimus ssp. canescens (A. Gray) T.I. Chuang & Heckard -- not accepted -- saltmarsh bird'sbeak, saltmarsh bird's-beak
  Cordylanthus maritimus ssp. maritimus Nutt. ex Benth. -- not accepted -- salt marsh bird's beak, salt marsh bird's-beak
  Cordylanthus maritimus ssp. palustris (Behr) T.I. Chuang & Heckard -- not accepted -- Pt. Reyes bird's-beak, northcoast bird's-beak
  Cordylanthus maritimus var. canescens (A. Gray) Jeps. -- not accepted
  Cordylanthus mollis A. Gray -- not accepted -- soft bird's-beak
  Cordylanthus mollis ssp. hispidus (Pennell) T.I. Chuang & Heckard -- not accepted -- hispid bird's-beak
  Cordylanthus mollis ssp. mollis A. Gray -- not accepted -- soft bird's-beak
  Cordylanthus nevadensis Edwin -- not accepted
  Cordylanthus nevinii A. Gray -- accepted -- Nevin's bird's-beak
  Cordylanthus nidularius J.T. Howell -- accepted -- Mount Diablo bird's-beak
  Cordylanthus orcuttianus A. Gray -- not accepted -- Orcutt's bird's-beak
  Cordylanthus pallescens Pennell -- not accepted
  Cordylanthus palmatus (Ferris) J.F. Macbr. -- not accepted -- palmate-bracted bird's beak, palmbract bird's-beak
  Cordylanthus palmatus ssp. carnulosus (Pennell) Munz -- not accepted
  Cordylanthus parviflorus (Ferris) Wiggins -- accepted -- purple bird'sbeak, purple bird's-beak
  Cordylanthus pilosus A. Gray -- accepted -- hairy bird's-beak
  Cordylanthus pilosus ssp. bolanderi (A. Gray) Munz -- not accepted
  Cordylanthus pilosus ssp. diffusus (Pennell) Munz -- not accepted
  Cordylanthus pilosus ssp. hansenii (Ferris) T.I. Chuang & Heckard -- accepted -- Hansen's bird's beak
  Cordylanthus pilosus ssp. pilosus A. Gray -- accepted -- hairy bird's beak
  Cordylanthus pilosus ssp. trifidus (B.L. Rob. & Greenm.) T.I. Chuang & Heckard -- accepted -- hairy bird's beak
  Cordylanthus pilosus var. trifidus B.L. Rob. & Greenm. -- not accepted
  Cordylanthus platycephalus Pennell -- not accepted
  Cordylanthus pringlei A. Gray -- accepted -- Pringle's bird's beak
  Cordylanthus ramosus Nutt. ex Benth. -- accepted -- bushy bird's beak, bushy birdbeak, muchbranched bird'sbeak
  Cordylanthus ramosus ssp. eremicus (Coville & C.V. Morton) Munz -- not accepted
  Cordylanthus ramosus ssp. setosus Pennell -- not accepted
  Cordylanthus ramosus var. puberulus J.F. Macbr. -- not accepted
  Cordylanthus rigidus (Benth.) Jeps. -- accepted -- stiffbranch bird's beak
  Cordylanthus rigidus ssp. brevibracteatus (A. Gray) Munz -- accepted -- stiffbranch bird's beak
  Cordylanthus rigidus ssp. littoralis (Ferris) T.I. Chuang & Heckard -- accepted -- seaside bird's-beak
  Cordylanthus rigidus ssp. rigidus (Benth.) Jeps. -- accepted -- stiffbranch bird's beak
  Cordylanthus rigidus ssp. setigerus T.I. Chuang & Heckard -- accepted -- stiffbranch bird's beak
  Cordylanthus rigidus var. littoralis (Ferris) Jeps. -- not accepted
  Cordylanthus tecopensis Munz & J.C. Roos -- not accepted -- Tecopa bird's-beak, Tecopa bird's beak
  Cordylanthus tenuifolius Pennell -- not accepted
  Cordylanthus tenuis A. Gray -- accepted -- slender bird'sbeak, slender bird's beak
  Cordylanthus tenuis ssp. barbatus T.I. Chuang & Heckard -- accepted -- Fresno County bird's-beak
  Cordylanthus tenuis ssp. brunneus (Jeps.) Munz -- accepted -- serpentine bird's beak
  Cordylanthus tenuis ssp. capillaris (Pennell) T.I. Chuang & Heckard -- accepted -- Pennell's bird's-beak, Pennell's bird's beak
  Cordylanthus tenuis ssp. pallescens (Pennell) T.I. Chuang & Heckard -- accepted -- pallid bird's-beak
  Cordylanthus tenuis ssp. tenuis A. Gray -- accepted -- slender bird'sbeak, slender bird's beak
  Cordylanthus tenuis ssp. viscidus (Howell) T.I. Chuang & Heckard -- accepted -- slender bird's beak
  Cordylanthus viscidus (Howell) Pennell ex M. Peck -- not accepted
  Cordylanthus wrightii A. Gray -- accepted -- Wright's bird's-beak, Wright's bird's beak
  Cordylanthus wrightii ssp. kaibabensis T.I. Chuang & Heckard -- accepted -- Kaibab bird's beak
  Cordylanthus wrightii ssp. tenuifolius (Pennell) T.I. Chuang & Heckard -- accepted -- Wright's bird's-beak, Wright's bird's beak
  Cordylanthus wrightii ssp. wrightii A. Gray -- accepted -- Wright's bird's-beak, Wright's bird's beak
  Cordylanthus wrightii var. pauciflorus Kearney & Peebles -- not accepted
  Cornutia L. -- accepted
  Cornutia grandiflora Steud. -- not accepted -- Mexican-blue
  Cornutia grandifolia (Schltdl. & Cham.) Schauer -- not accepted
  Cornutia obovata Urb. -- accepted -- palo de nigua, capá jigüerilla, nigua
  Cornutia pyramidata L. -- accepted -- azulejo
  Craniolaria L. -- accepted
  Craniolaria annua L. -- accepted -- escorzonera
  Crantzia ambigua (Urb.) Britton -- not accepted
  Craterostigma Hochst. -- accepted
  Craterostigma plantagineum Hochst. -- accepted -- blue gem
  Craterostigma pumilum Hochst. -- accepted
  Crescentia L. -- accepted
  Crescentia alata Kunth -- accepted -- morrito
  Crescentia cujete L. -- accepted -- common calabash tree
  Crescentia latifolia Mill. -- not accepted
  Crescentia linearifolia Miers -- accepted -- higuerito
  Crescentia portoricensis Britton -- accepted -- calabash tree, higuero de sierra
  Croftia parvifolia (Torr.) Small -- not accepted
  Crossandra Salisb. -- accepted
  Crossandra fascicularis auct. non Benth. -- not accepted
  Crossandra infundibuliformis (L.) Nees -- accepted
  Crossandra nilotica Oliv. -- accepted
  Cunila D. Royen ex L. -- accepted
  Cunila coccinea Nutt. ex Hook. -- not accepted
  Cunila glabella Michx. -- not accepted
  Cunila mariana L. -- not accepted
  Cunila origanoides (L.) Britton -- accepted -- common dittany
  Cunila pulegioides L. -- not accepted
  Cybistax donnell-smithii (Rose) Seibert -- not accepted
  Cycnium E. Mey. ex Benth. -- accepted
  Cycnium tubulosum (L. f.) Engl. -- accepted
  Cycnium tubulosum ssp. montanum (N.E. Br.) O.J. Hansen -- not accepted
  Cydista Miers -- accepted -- withe
  Cydista aequinoctialis (L.) Miers -- accepted -- guard withe
  Cydista diversifolia (Kunth) Miers -- accepted
  Cymbalaria Hill -- accepted
  Cymbalaria muralis G. Gaertn., B. Mey. & Scherb. -- accepted -- Kenilworth ivy
  Cymburus urticifolius sensu Salisb. -- not accepted
  Cyrtandra J.R. Forst. & G. Forst. -- accepted
  Cyrtandra adpressipilosa H. St. John -- not accepted
  Cyrtandra arcuata H. St. John -- not accepted
  Cyrtandra arguta (A. Gray) C.B. Clarke -- not accepted
  Cyrtandra baccifera C.B. Clarke -- not accepted
  Cyrtandra begoniifolia Hillebr. -- not accepted
  Cyrtandra biserrata Hillebr. -- accepted -- Molokai cyrtandra
  Cyrtandra brevicalyx (Hillebr.) H. St. John -- not accepted
  Cyrtandra brevicornuta H. St. John -- not accepted
  Cyrtandra bryanii H. St. John & Storey -- not accepted
  Cyrtandra calpidicarpa (Rock) H. St. John & Storey -- accepted -- valley cyrtandra
  Cyrtandra calycoschiza (H. St. John & Storey) H. St. John -- not accepted
  Cyrtandra campaniformis H. St. John -- not accepted
  Cyrtandra charadraia H. St. John -- not accepted
  Cyrtandra chartacea H. St. John & Storey -- not accepted
  Cyrtandra collarifera H. St. John & Storey -- not accepted
  Cyrtandra confertiflora (Wawra) C.B. Clarke -- accepted -- lava cyrtandra
  Cyrtandra confertiflora var. confertiflora (Wawra) C.B. Clarke -- accepted -- lava cyrtandra
  Cyrtandra confertiflora var. obovata (Wawra) C.B. Clarke -- not accepted -- lava cyrtandra
  Cyrtandra cordifolia Gaudich. -- accepted -- heartleaf cyrtandra
  Cyrtandra cordifolia var. brevipilita H. St. John -- not accepted
  Cyrtandra cordifolia var. gynoglabra Rock -- not accepted
  Cyrtandra cornuta H. St. John -- not accepted
  Cyrtandra crenata H. St. John & Storey -- accepted -- ha`iwale, Kahana Valley cyrtandra
  Cyrtandra cyaneoides Rock -- accepted -- mapele
  Cyrtandra degenerans (Wawra) A. Heller -- not accepted
  Cyrtandra dentata H. St. John & Storey -- accepted -- ha`iwale, mountain cyrtandra
  Cyrtandra ellipticifolia H. St. John -- not accepted
  Cyrtandra elliptisepala H. St. John -- not accepted
  Cyrtandra elstonii Hochr. -- not accepted
  Cyrtandra ferripilosa H. St. John -- accepted -- red-hair cyrtandra
  Cyrtandra filipes Hillebr. -- accepted -- gulch cyrtandra, ha'iwale
  Cyrtandra fosbergii H. St. John & Storey -- not accepted
  Cyrtandra frederickii H. St. John & Storey -- not accepted
  Cyrtandra fusiformis H. St. John & Storey -- not accepted
  Cyrtandra garberi H. St. John -- not accepted
  Cyrtandra garnotiana Gaudich. -- accepted -- hahala
  Cyrtandra gayana A. Heller -- not accepted
  Cyrtandra gayana var. macrocarpa Skottsb. -- not accepted
  Cyrtandra giffardii Rock -- accepted -- ha`iwale, forest cyrtandra
  Cyrtandra glauca Drake -- not accepted
  Cyrtandra gracilis Hillebr. ex C.B. Clarke -- accepted -- Palolo Valley cyrtandra
  Cyrtandra grandiflora Gaudich. -- accepted -- largeflower cyrtandra
  Cyrtandra grayana Hillebr. -- accepted -- Pacific cyrtandra
  Cyrtandra grayana var. lanaiensis Hillebr. -- not accepted
  Cyrtandra grayana var. latifolia Hillebr. -- not accepted
  Cyrtandra grayana var. linearifolia Rock -- not accepted
  Cyrtandra grayana var. nervosa Rock -- not accepted
  Cyrtandra grayi C.B. Clarke -- accepted -- Gray's cyrtandra
  Cyrtandra grossecrenata H. St. John & Storey -- not accepted
  Cyrtandra halawensis Rock -- accepted -- toothleaf cyrtandra
  Cyrtandra hashimotoi Rock -- accepted -- Maui cyrtandra
  Cyrtandra hawaiensis C.B. Clarke -- accepted -- Hawai'i cyrtandra
  Cyrtandra heinrichii H. St. John -- accepted -- lava cyrtandra
  Cyrtandra hematos H. St. John -- accepted -- singleflower cyrtandra
  Cyrtandra hii C.N. Forbes -- not accepted
  Cyrtandra hirsutula H. St. John & Storey -- not accepted
  Cyrtandra hobdyi H. St. John -- not accepted
  Cyrtandra hyperdasa H. St. John -- not accepted
  Cyrtandra infrapallida H. St. John -- not accepted
  Cyrtandra infundibuliformis H. St. John -- not accepted
  Cyrtandra intonsa H. St. John & Storey -- not accepted
  Cyrtandra intrapilosa H. St. John -- not accepted
  Cyrtandra intravillosa H. St. John & Storey -- not accepted
  Cyrtandra kahukuensis H. St. John & Storey -- not accepted
  Cyrtandra kailuaensis H. St. John -- not accepted
  Cyrtandra kalichii Wawra -- accepted
  Cyrtandra kalihii Wawra -- not accepted -- Koolau Range cyrtandra
  Cyrtandra kaluanuiensis H. St. John -- not accepted
  Cyrtandra kamoolaensis H. St. John -- accepted -- Kamo'oloa cyrtandra
  Cyrtandra kaneoheensis H. St. John -- not accepted
  Cyrtandra kauaiensis Wawra -- accepted -- ulunahele
  Cyrtandra kaulantha H. St. John & Storey -- accepted -- Waikane Valley cyrtandra, haiwale
  Cyrtandra kealiae Wawra -- accepted -- Wahiawa Mountain cyrtandra
  Cyrtandra knudsenii Rock -- not accepted
  Cyrtandra kohalae Rock -- accepted -- Kohala Mountain cyrtandra
  Cyrtandra koolauensis H. St. John & Storey -- not accepted
  Cyrtandra latebrosa Hillebr. -- not accepted
  Cyrtandra latebrosa var. subglabra Hillebr. -- not accepted
  Cyrtandra laxiflora H. Mann -- accepted -- Oahu cyrtandra
  Cyrtandra lessoniana Gaudich. -- accepted -- Lesson's cyrtandra
  Cyrtandra lessoniana var. angustifolia Hillebr. -- not accepted
  Cyrtandra lessoniana var. intrapubens H. St. John -- not accepted
  Cyrtandra lessoniana var. koolauloaensis H. St. John -- not accepted
  Cyrtandra leucocalyx H. St. John -- not accepted
  Cyrtandra limahuliensis H. St. John -- not accepted -- ha`iwale, Limahuli cyrtandra
  Cyrtandra limosiflora Rock -- not accepted
  Cyrtandra linearis H. St. John -- not accepted
  Cyrtandra longicalyx H. St. John -- not accepted
  Cyrtandra longifolia (Wawra) Hillebr. ex C.B. Clarke -- accepted -- longleaf cyrtandra
  Cyrtandra longifolia var. arborescens (Wawra) C.B. Clarke -- not accepted
  Cyrtandra longifolia var. degenerans (Wawra) C.B. Clarke -- not accepted
  Cyrtandra longifolia var. parallela C.B. Clarke -- not accepted
  Cyrtandra longifolia var. wahiawae Rock -- not accepted
  Cyrtandra longiloba H. St. John -- not accepted
  Cyrtandra lydgatei Hillebr. -- accepted -- Lydgate's cyrtandra
  Cyrtandra lysiosepala (A. Gray) C.B. Clarke -- accepted -- oppositeleaf cyrtandra
  Cyrtandra lysiosepala var. fauriei (H. Lév.) Rock -- not accepted
  Cyrtandra lysiosepala var. grayi (C.B. Clarke) Rock -- not accepted
  Cyrtandra lysiosepala var. haleakalensis Rock -- not accepted
  Cyrtandra lysiosepala var. hawaiiensis Skottsb. -- not accepted
  Cyrtandra lysiosepala var. latifolia Rock -- not accepted
  Cyrtandra lysiosepala var. pilosa Hillebr. -- not accepted
  Cyrtandra macraei A. Gray -- accepted -- upland cyrtandra
  Cyrtandra macrantha C.B. Clarke -- accepted
  Cyrtandra macrocalyx Hillebr. -- accepted -- largecalyx cyrtandra
  Cyrtandra malacophylla var. erosa Rock -- not accepted
  Cyrtandra mauiensis Rock -- not accepted
  Cyrtandra mauiensis var. truncata Rock -- not accepted
  Cyrtandra megastigmata H. St. John -- not accepted
  Cyrtandra menziesii Hook. & Arn. -- accepted -- ha`iwale
  Cyrtandra montis-loa Rock -- not accepted
  Cyrtandra munroi C.N. Forbes -- accepted -- ha`iwale, Lanaihale cyrtandra
  Cyrtandra nanawaleensis H. St. John -- accepted
  Cyrtandra niuensis H. St. John -- not accepted
  Cyrtandra nubincolens H. St. John -- not accepted
  Cyrtandra oahuensis H. Lév. -- not accepted
  Cyrtandra oblanceolata H. St. John & Storey -- not accepted
  Cyrtandra oenobarba H. Mann -- accepted -- haiwale, shaggystem cyrtandra
  Cyrtandra oenobarba var. herbacea (Wawra) A. Heller -- not accepted
  Cyrtandra oenobarba var. petiolaris Wawra -- not accepted
  Cyrtandra olivacea H. St. John -- not accepted
  Cyrtandra oliveri Rock -- not accepted
  Cyrtandra olona C.N. Forbes -- accepted -- Kauai cyrtandra
  Cyrtandra oulophylla H. St. John & Storey -- not accepted
  Cyrtandra oxybapha W.L. Wagner & Herbst -- accepted -- Pohakea Gulch cyrtandra, ha'iwale
  Cyrtandra paliku W.L. Wagner, K.R. Wood & Lorence -- accepted -- cliffside cyrtandra, haiwale
  Cyrtandra paloloensis H. St. John & Storey -- not accepted
  Cyrtandra paludosa Gaudich. -- accepted -- kanawao ke`oke`o
  Cyrtandra paludosa var. haupuensis Rock -- not accepted
  Cyrtandra paludosa var. integrifolia Hillebr. -- not accepted
  Cyrtandra paludosa var. irrostrata H. St. John -- not accepted
  Cyrtandra paludosa var. microcarpa Wawra -- accepted -- kanawao ke`oke`o
  Cyrtandra paludosa var. paludosa Gaudich. -- accepted -- kanawao ke`oke`o
  Cyrtandra paludosa var. subherbacea Wawra -- not accepted
  Cyrtandra partita H. St. John -- not accepted
  Cyrtandra pearsallii H. St. John -- not accepted
  Cyrtandra perstaminodica H. St. John -- not accepted
  Cyrtandra pickeringii A. Gray -- accepted -- Pickering's cyrtandra
  Cyrtandra pickeringii var. waiheae Rock -- not accepted
  Cyrtandra piligyna H. St. John & Storey -- not accepted
  Cyrtandra platyphylla A. Gray -- accepted -- `ilihia
  Cyrtandra platyphylla var. brevipes Skottsb. -- not accepted
  Cyrtandra platyphylla var. hiloensis Rock -- not accepted
  Cyrtandra platyphylla var. membranacea Rock -- not accepted
  Cyrtandra platyphylla var. parviflora Rock -- not accepted
  Cyrtandra platyphylla var. robusta Rock -- not accepted
  Cyrtandra platyphylla var. stylopubens Rock -- not accepted
  Cyrtandra plurifolia H. St. John & Storey -- not accepted
  Cyrtandra poamohoensis H. St. John & Storey -- not accepted
  Cyrtandra polyantha C.B. Clarke -- accepted -- ha`iwale, Niu Valley cyrtandra
  Cyrtandra procera Hillebr. -- accepted -- bog cyrtandra
  Cyrtandra propinqua C.N. Forbes -- accepted -- arrowleaf cyrtandra
  Cyrtandra pruinosa H. St. John & Storey -- accepted -- frosted cyrtandra
  Cyrtandra pupukeaensis H. St. John & Storey -- not accepted
  Cyrtandra reflexa H. St. John & Storey -- not accepted
  Cyrtandra rivularis H. St. John & Storey -- accepted -- river cyrtandra
  Cyrtandra rotata H. St. John -- not accepted
  Cyrtandra sandwicensis (H. Lév.) H. St. John & Storey -- accepted -- hairy cyrtandra
  Cyrtandra sessilis H. St. John & Storey -- accepted -- haiwale, windyridge cyrtandra
  Cyrtandra skottsbergii H. St. John & Storey -- not accepted
  Cyrtandra spathulata H. St. John -- accepted -- spoonleaf cyrtandra
  Cyrtandra stupantha H. St. John & Storey -- not accepted
  Cyrtandra subcordata H. St. John -- not accepted
  Cyrtandra suberecta H. St. John -- not accepted
  Cyrtandra subumbellata (Hillebr.) H. St. John & Storey -- accepted -- ha`iwale, parasol cyrtandra
  Cyrtandra subumbellata var. intonsa H. St. John -- not accepted
  Cyrtandra ternata H. St. John -- not accepted
  Cyrtandra tintinnabula Rock -- accepted -- ha`iwale, Laupahoehoe cyrtandra
  Cyrtandra triflora Gaudich. -- not accepted
  Cyrtandra tristis Hillebr. ex C.B. Clarke -- not accepted
  Cyrtandra umbracculiflora Rock -- not accepted
  Cyrtandra vanioti H. Lév. -- not accepted
  Cyrtandra vaniotii H. Lév. -- not accepted
  Cyrtandra villicalyx var. pubentigyna H. St. John & Storey -- not accepted
  Cyrtandra villosa H. St. John & Storey -- not accepted
  Cyrtandra villosiflora H. St. John -- not accepted
  Cyrtandra viridiflora H. St. John & Storey -- accepted -- ha`iwale, greenleaf cyrtandra
  Cyrtandra wagneri Lorence & Perlman -- accepted
  Cyrtandra waianaeensis H. St. John & Storey -- accepted -- Waianaeuka cyrtandra
  Cyrtandra waianuensis Rock -- not accepted
  Cyrtandra wainihaensis H. Lév. -- accepted -- island cyrtandra
  Cyrtandra waiolani Wawra -- accepted -- fuzzyflower cyrtandra, haiwale
  Cyrtandra waiolani var. capitata Hillebr. -- not accepted
  Cyrtandra waiomaoensis H. St. John -- not accepted
  Cyrtandra wawrae C.B. Clarke -- accepted -- rockface cyrtandra
  Cyrtandra wilderi H. St. John & Storey -- not accepted
  Cyrtandra X alata H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X alnea H. St. John (pro. sp.) -- accepted
  Cyrtandra X ambigua (Hillebr.) H. St. John & Storey (pro. sp.) -- accepted -- ambiguous cyrtandra
  Cyrtandra X atomigyna H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X axilliflora H. St. John & Storey (pro. sp.) -- accepted -- axilflower cyrtandra
  Cyrtandra X basipartita H. St. John (pro. sp.) -- accepted
  Cyrtandra X carinata H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X caudatisepala H. St. John (pro. sp.) -- accepted
  Cyrtandra X caulescens Rock (pro. sp.) -- accepted
  Cyrtandra X christophersenii H. St. John & Storey (pro. sp.) -- accepted -- Christophersen's cyrtandra
  Cyrtandra X cladantha Skottsb. (pro. sp.) -- accepted
  Cyrtandra X conradtii Rock (pro. sp.) -- accepted -- Conradt's cyrtandra
  Cyrtandra X crassifolia (Hillebr.) Rock (pro. sp.) -- accepted
  Cyrtandra X crassior H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X cupuliformis H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X ferrocolorata H. St. John (pro. sp.) -- accepted
  Cyrtandra X ferruginosa H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X forbesii H. St. John & Storey -- accepted -- Forbes's cyrtandra
  Cyrtandra X georgiana Forbes (pro. sp.) -- accepted -- Georgia cyrtandra
  Cyrtandra X hillebrandii Oliv. -- accepted -- Hillebrand's cyrtandra
  Cyrtandra X honolulensis Wawra (pro. sp.) -- accepted -- Honolulu cyrtandra
  Cyrtandra X hosakae H. St. John & Storey (pro. sp.) -- accepted -- Hosaka's cyrtandra
  Cyrtandra X kaalae H. St. John & Storey (pro. sp.) -- accepted -- Kaala cyrtandra
  Cyrtandra X kahanaensis H. St. John & Storey (pro. sp.) -- accepted -- Kahana cyrtandra
  Cyrtandra X kipahuluensis H. St. John (pro. sp.) -- accepted -- Kipahulu cyrtandra
  Cyrtandra X kipapaensis H. St. John & Storey (pro. sp.) -- accepted -- Kipapa cyrtandra
  Cyrtandra X laevis H. St. John (pro. sp.) -- accepted
  Cyrtandra X malacophylla C.B. Clarke (pro. sp.) -- accepted
  Cyrtandra X mannii H. St. John & Storey (pro. sp.) -- accepted -- Mann's cyrtandra
  Cyrtandra X nutans H. St. John (pro. sp.) -- accepted
  Cyrtandra X opaeulae H. St. John & Storey (pro. sp.) -- accepted -- opaeula cyrtandra
  Cyrtandra X pubens H. St. John (pro. sp.) -- accepted
  Cyrtandra X ramosissima Rock (pro. sp.) -- accepted
  Cyrtandra X rockii H. St. John & Storey (pro. sp.) -- accepted -- Rock's cyrtandra
  Cyrtandra X scabrella C.B. Clarke (pro. sp.) -- accepted
  Cyrtandra X subintegra H. St. John (pro. sp.) -- accepted
  Cyrtandra X turbiniformis H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X umbraculiflora Rock (pro. sp.) -- accepted
  Cyrtandra X villicalyx H. St. John & Storey (pro. sp.) -- accepted
  Cyrtandra X waihoiensis H. St. John -- accepted -- sharp-tooth cyrtandra
  Dasistoma Raf. -- accepted
  Dasistoma calycosa Mack. & Bush -- not accepted
  Dasistoma dispersa Small -- not accepted
  Dasistoma flava (L.) Alph. Wood -- not accepted
  Dasistoma grandiflora (Benth.) Alph. Wood -- not accepted
  Dasistoma laevigata (Raf.) Chapm. -- not accepted
  Dasistoma levigata (Raf.) Chapm. -- not accepted
  Dasistoma macrophylla (Nutt.) Raf. -- accepted -- mullein foxglove, mullein seymeria
  Dasistoma patula Chapm. -- not accepted
  Dasistoma pectinata (Nutt.) Benth. -- not accepted
  Dasistoma pedicularia (L.) Benth. -- not accepted
  Dasistoma serrata (Torr. ex Benth.) Small -- not accepted
  Dasistoma virginica (L.) Britton -- not accepted
  Dendrosicus Raf. -- not accepted
  Dianthera americana L. -- not accepted
  Dianthera americana var. subcoriacea (Fernald) Shinners -- not accepted
  Dianthera androsaemifolia (Nees) Griseb. -- not accepted
  Dianthera angusta (Chapm.) Small -- not accepted
  Dianthera comata L. -- not accepted
  Dianthera crassifolia Chapm. -- not accepted
  Dianthera humilis (Michx.) Engelm. & A. Gray -- not accepted
  Dianthera lanceolata (Chapm.) Small -- not accepted
  Dianthera ovata Walter -- not accepted
  Dianthera ovata var. angusta Chapm. -- not accepted
  Dianthera ovata var. lanceolata Chapm. -- not accepted
  Dianthera parviflora (Buckley) A. Gray -- not accepted
  Dianthera parvifolia (Torr.) A. Gray -- not accepted
  Dianthera pectoralis (Jacq.) Murray -- not accepted
  Dianthera secunda (Vahl) Griesb. -- not accepted
  Diapedium assurgens (L.) Kuntze -- not accepted
  Diapedium brachiatum (Pursh) Kuntze -- not accepted
  Diapedium krugii (Urb.) Britton -- not accepted
  Diapedium resupinatum (Vahl) Kuntze -- not accepted
  Diapedium torreyi (A. Gray) A. Heller -- not accepted
  Dicerandra Benth. -- accepted -- balm
  Dicerandra christmanii Huck & Judd -- not accepted -- Garrett's mint, Lake Wales balm
  Dicerandra cornutissima Huck -- not accepted -- longspurred mint, longspur balm
  Dicerandra densiflora Benth. -- accepted -- Florida balm
  Dicerandra frutescens Shinners -- accepted -- scrub mint, scrub balm
  Dicerandra frutescens ssp. frutescens Shinners -- accepted -- scrub balm
  Dicerandra frutescens ssp. modesta Huck -- accepted
  Dicerandra immaculata Lakela -- not accepted -- Lakela's mint, spotless balm
  Dicerandra immaculata var. immaculata Lakela -- not accepted
  Dicerandra immaculata var. savannarum Huck -- not accepted
  Dicerandra linearifolia (Elliott) Benth. -- accepted -- coastalplain balm, coastal plain balm
  Dicerandra linearifolia var. linearifolia (Elliott) Benth. -- accepted -- coastalplain balm, coastal plain balm
  Dicerandra linearifolia var. robustior Huck -- accepted -- coastalplain balm, coastal plain balm
  Dicerandra modesta (Huck) Huck -- not accepted
  Dicerandra odoratissima R.M. Harper -- accepted -- rose balm
  Dicerandra radfordiana Huck -- accepted -- Radford's balm
  Dicerandra thinicola H.A. Mill. -- not accepted
  Dicerandra X thinicola H.A. Mill. (pro. sp.) -- not accepted
  Dicliptera Juss. -- accepted -- foldwing
  Dicliptera assurgens (L.) Juss. -- not accepted
  Dicliptera assurgens var. vahliana (Nees) M. Gómez -- not accepted
  Dicliptera brachiata (Pursh) Spreng. -- accepted -- branched foldwing
  Dicliptera brachiata var. attenuata A. Gray -- not accepted
  Dicliptera brachiata var. glandulosa (Scheele) Fernald -- not accepted
  Dicliptera brachiata var. ruthii Fernald -- not accepted
  Dicliptera chinensis (L.) Juss. -- accepted -- Chinese foldwing
  Dicliptera glandulosa Scheele -- not accepted
  Dicliptera halei Riddell -- not accepted
  Dicliptera krugii Urb. -- accepted -- Krug's foldwing
  Dicliptera martinicensis (Jacq.) Juss. -- accepted -- Martinique foldwing
  Dicliptera pseudoverticillaris A. Gray -- not accepted
  Dicliptera resupinata (Vahl) Juss. -- accepted -- Arizona foldwing
  Dicliptera sexangularis (L.) Juss. -- accepted -- sixangle foldwing
  Dicliptera torreyi A. Gray -- not accepted
  Dicliptera vahliana Nees -- not accepted
  Dicliptera viridiflora (Nees) R.W. Long -- not accepted
  Dicranostegia (A. Gray) Pennell -- accepted
  Dicranostegia orcuttiana (A. Gray) Pennell -- accepted -- Orcutt's bird's-beak
  Digitalis L. -- accepted -- foxglove
  Digitalis ambigua Murray -- not accepted
  Digitalis ferruginea L. -- accepted -- rusty foxglove
  Digitalis grandiflora Mill. -- accepted -- yellow foxglove
  Digitalis lanata Ehrh. -- accepted -- Grecian foxglove
  Digitalis lutea L. -- accepted -- straw foxglove
  Digitalis mariana Boiss. -- accepted
  Digitalis mariana ssp. heywoodii (P. Silva & M. Silva) Hinz -- accepted
  Digitalis orientalis Mill. -- not accepted
  Digitalis purpurea L. -- accepted -- purple foxglove
  Digitalis purpurea ssp. amandiana (Samp.) Hinz -- accepted
  Digitalis purpurea ssp. heywoodii P. Silva & M. Silva -- not accepted
  Digitalis purpurea ssp. purpurea L. -- accepted -- purple foxglove
  Digitalis purpurea var. alba hort. -- not accepted -- purple foxglove
  Digitalis purpurea var. amandiana (Samp.) Cout. -- not accepted
  Digitalis purpurea var. purpurea L. -- not accepted -- purple foxglove
  Digitalis purpurea var. tomentosa (Hoffmanns. & Link) Webb -- not accepted
  Diplacus Nutt. -- accepted -- bush monkeyflower
  Diplacus arachnoideus Greene -- not accepted
  Diplacus aridus Abrams -- accepted -- San Diego bush monkeyflower, low bush monkeyflower
  Diplacus aurantiacus (Curtis) Jeps. -- accepted -- orange bush monkeyflower
  Diplacus aurantiacus ssp. aurantiacus (Curtis) Jeps. -- accepted -- orange bush monkeyflower
  Diplacus aurantiacus ssp. australis (McMinn) R.M. Beeks -- accepted -- orange bush monkeyflower
  Diplacus australis McMinn -- not accepted
  Diplacus calycinus Eastw. -- accepted -- Kaweah River bush monkeyflower
  Diplacus cardinalis (Douglas ex Benth.) Groenland -- not accepted
  Diplacus clevelandii (Brandegee) Greene -- accepted -- Cleveland's bush monkeyflower
  Diplacus fasciculatus (Pennell) McMinn -- accepted -- Santa Lucia Mountain bush monkeyflower
  Diplacus glutinosus (J.C. Wendl.) Nutt. -- not accepted
  Diplacus glutinosus var. aurantiacus (Curtis) Lindl. -- not accepted
  Diplacus glutinosus var. grandiflorus Lindl. & J. Paxton -- not accepted
  Diplacus glutinosus var. puniceus (Nutt.) Benth. -- not accepted
  Diplacus grandiflorus (Lindl. & J. Paxton) Groenland -- accepted -- largeflower bush monkeyflower
  Diplacus grandiflorus Greene -- not accepted -- largeflower bush monkeyflower
  Diplacus latifolius Nutt. -- not accepted
  Diplacus leptanthus Nutt. -- not accepted
  Diplacus linearis (Benth.) Greene -- accepted -- chaparral bush monkeyflower
  Diplacus lompocensis McMinn -- accepted -- Lompoc Mesa bush monkeyflower
  Diplacus longiflorus Nutt. -- accepted -- southern bush monkeyflower
  Diplacus longiflorus var. calycinus (Eastw.) Jeps. -- not accepted
  Diplacus longiflorus var. linearis (Benth.) McMinn -- not accepted
  Diplacus longiflorus var. rutilus (A.L. Grant) McMinn -- not accepted
  Diplacus parviflorus Greene -- accepted -- island bush monkeyflower
  Diplacus puniceus Nutt. -- accepted -- red bush monkeyflower
  Diplacus rutilus (A.L. Grant) McMinn -- accepted -- Santa Susana bush monkeyflower
  Dipteracanthus drummondianus Nees -- not accepted
  Dipteracanthus linearis Torr. & A. Gray -- not accepted
  Dipteracanthus micranthus Engelm. & A. Gray -- not accepted
  Dipteracanthus nudiflorus Engelm. & A. Gray -- not accepted
  Dipteracanthus strepens (L.) Nees -- not accepted
  Distictella Kuntze -- accepted
  Distictella broadwayana Urb. -- not accepted
  Distictella magnoliifolia (Kunth) Sandwith -- accepted
  Distictella racemosa (Bureau & K. Schum.) Urb. -- not accepted
  Distictis Mart. ex Meisn. -- accepted
  Distictis buccinatoria (DC.) A.H. Gentry -- accepted -- blood-trumpet
  Distictis lactiflora (Vahl) DC. -- accepted -- liana fragante
  Distictis racemosa Bureau & K. Schum. -- not accepted
  Distictis robinsoni J.R. Johnst. -- not accepted
  Dolichandrone (Fenzl) Seem. -- accepted
  Dolichandrone spathacea (L. f.) K. Schum. -- accepted
  Dopatrium Buch.-Ham. ex Benth. -- accepted
  Dopatrium junceum (Roxb.) Buch.-Ham. ex Benth. -- accepted -- horsefly's eye
  Doxantha Miers -- not accepted
  Doxantha unguis-cati (L.) Miers -- not accepted
  Doxantha unguiscati (L.) Miers -- not accepted
  Dracocephalum L. -- accepted -- dragonhead
  Dracocephalum correllii Lundell -- not accepted
  Dracocephalum denticulatum Aiton -- not accepted
  Dracocephalum formosius (Lunell) Rydb. -- not accepted
  Dracocephalum intermedium Nutt. -- not accepted
  Dracocephalum leptophyllum (Small) Small -- not accepted
  Dracocephalum moldavica L. -- accepted -- Moldavian dragonhead
  Dracocephalum nuttallii Britton -- not accepted
  Dracocephalum parviflorum Nutt. -- accepted -- American dragonhead
  Dracocephalum peltatum L. -- not accepted
  Dracocephalum purpureum (Walter) E.M. McClint. ex Gleason -- not accepted
  Dracocephalum thymiflorum L. -- accepted -- thyme-leaf dragonhead, thymeleaf dragonhead
  Dracocephalum veroniciforme (Small) Small -- not accepted
  Dracocephalum virginianum L. -- not accepted
  Drejera juncea Torr. -- not accepted
  Drejera parviflora Buckley -- not accepted
  Drejera puberula Torr. -- not accepted
  Drejera thurberi Torr. -- not accepted
  Drejera wrightii Torr. -- not accepted
  Drejerella Lindau -- not accepted
  Drejerella mirabiloides (Lam.) Lindau -- not accepted
  Drejerella tobagensis Urb. -- not accepted
  Duchartrea sintenisii (Urb.) Britton -- not accepted
  Duranta L. -- accepted
  Duranta erecta L. -- accepted -- golden dewdrops
  Duranta erecta var. alba (Mast.) Caro -- not accepted
  Duranta fletcherana Moldenke -- not accepted
  Duranta fletcheriana Moldenke -- not accepted
  Duranta repens L. -- not accepted
  Duranta repens var. alba (Mast.) L.H. Bailey -- not accepted
  Duranta repens var. microphylla (Desf.) Moldenke -- not accepted
  Dyschoriste Nees -- accepted -- snakeherb
  Dyschoriste angusta (A. Gray) Small -- accepted -- pineland snakeherb
  Dyschoriste crenulata Kobuski -- accepted -- wavyleaf snakeherb
  Dyschoriste decumbens (A. Gray) Kuntze -- not accepted -- spreading snakeherb
  Dyschoriste humistrata (Michx.) Kuntze -- accepted -- swamp snakeherb
  Dyschoriste linearis (Torr. & A. Gray) Kuntze -- accepted -- narrowleaf dyschoriste, polkadots
  Dyschoriste linearis var. linearis (Torr. & A. Gray) Kuntze -- accepted -- polkadots
  Dyschoriste linearis var. sanpatriciensis Henrickson -- accepted
  Dyschoriste oblongifolia (Michx.) Kuntze -- accepted -- oblongleaf snakeherb
  Dyschoriste oblongifolia var. angusta (A. Gray) R.W. Long -- not accepted
  Dyschoriste schiedeana (Nees) Kuntze -- accepted -- Schied's snakeherb
  Dyschoriste schiedeana var. cinerascens Henrickson & Hilsenb. -- accepted
  Dyschoriste schiedeana var. decumbens (A. Gray) Henrickson -- accepted -- spreading snakeherb
  Elephantella attollens (A. Gray) A. Heller -- not accepted
  Elephantella groenlandica (Retz.) Rydb. -- not accepted
  Elsholtzia Willd. -- accepted
  Elsholtzia ciliata (Thunb.) Hyl. -- accepted -- crested latesummer mint
  Elsholtzia cristata Willd. -- not accepted
  Elytraria Michx. -- accepted -- scalystem
  Elytraria bromoides Oerst. -- accepted -- wheatspike scalystem
  Elytraria caroliniensis (J.F. Gmel.) Pers. -- accepted -- Carolina scalystem
  Elytraria caroliniensis var. angustifolia (Fernald) S.F. Blake -- accepted -- Carolina scalystem
  Elytraria caroliniensis var. caroliniensis (J.F. Gmel.) Pers. -- accepted -- Carolina scalystem
  Elytraria imbricata (Vahl) Pers. -- accepted -- purple scalystem
  Elytraria tridentata Vahl -- not accepted
  Elytraria virgata Michx. -- not accepted
  Elytraria virgata var. angustifolia Fernald -- not accepted
  Emorya Torr. -- accepted
  Emorya suaveolens Torr. -- accepted -- emorybush
  Enallagma latifolia (Mill.) Small -- not accepted
  Epifagus Nutt. -- accepted -- beechdrops
  Epifagus virginiana (L.) W.P.C. Barton -- accepted -- beechdrops
  Episcia Mart. -- accepted
  Episcia cupreata (Hook.) Hanst. -- accepted -- flame violet
  Episcia reptans Mart. -- accepted
  Epixiphium (Engelm. ex A. Gray) Munz -- accepted
  Epixiphium wislizeni (Engelm. ex A. Gray) Munz -- accepted -- balloonbush
  Eranthemum L. -- accepted
  Eranthemum nervosum (Vahl) R. Br. ex Roem. & Schult. -- not accepted
  Eranthemum pulchellum Andrews -- accepted -- blue-sage
  Eremophila R. Br. -- accepted
  Eremophila subfloccosa Benth. -- accepted -- fuchsia bush
  Erinus L. -- accepted
  Erinus alpinus L. -- accepted -- liver balsam, alpine balsam
  Erinus verticillatus Mill. -- not accepted
  Erythranthe cardinalis (Douglas ex Benth.) Spach -- not accepted
  Erythrochlamys Gürke -- not accepted
  Erythrochlamys spectabilis Gürke -- not accepted
  Eunanus angustatus (A. Gray) Greene -- not accepted
  Eunanus angustifolius Greene -- not accepted
  Eunanus austiniae Greene -- not accepted
  Eunanus bicolor A. Gray -- not accepted
  Eunanus bigelovii A. Gray -- not accepted
  Eunanus bolanderi (A. Gray) Greene -- not accepted
  Eunanus brevipes (Benth.) Greene -- not accepted
  Eunanus breweri Greene -- not accepted
  Eunanus clivicola (Greenm.) A. Heller -- not accepted
  Eunanus congdonii (B.L. Rob.) Greene -- not accepted
  Eunanus coulteri Harv. & A. Gray ex Benth. -- not accepted
  Eunanus coulteri var. angustatus A. Gray -- not accepted
  Eunanus cusickii Greene -- not accepted
  Eunanus douglasii Benth. -- not accepted
  Eunanus douglasii var. parviflorus Greene -- not accepted
  Eunanus fremontii Benth. -- not accepted
  Eunanus kelloggii Curran ex Greene -- not accepted
  Eunanus kelloggii var. parviflorus (Greene) Jeps. -- not accepted
  Eunanus layneae Greene -- not accepted
  Eunanus leptaleus (A. Gray) Greene -- not accepted
  Eunanus mephiticus (Greene) Greene -- not accepted
  Eunanus mohavensis (Lemmon) Greene -- not accepted
  Eunanus nanus (Hook. & Arn.) Holz. -- not accepted
  Eunanus pictus Curran ex Greene -- not accepted
  Eunanus pulchellus Drew ex Greene -- not accepted
  Eunanus rattanii (A. Gray) Greene -- not accepted
  Eunanus subsecundus (A. Gray) Greene -- not accepted
  Eunanus subuniflorus (Hook. & Arn.) Greene -- not accepted
  Eunanus tolmiei Benth. -- not accepted
  Eunanus torreyi (A. Gray) Greene -- not accepted
  Eunanus tricolor (Hartw. ex Lindl.) Greene -- not accepted
  Euphrasia L. -- accepted -- eyebright
  Euphrasia americana auct. Wetts. -- not accepted
  Euphrasia arctica ssp. borealis (F. Towns.) Yeo -- not accepted
  Euphrasia arctica var. disjuncta (Fernald & Wiegand) Cronquist -- not accepted
  Euphrasia arctica var. dolosa (B. Boivin) B. Boivin -- not accepted
  Euphrasia arctica var. mollis (Ledeb.) S.L. Welsh -- not accepted
  Euphrasia borealis (F. Towns.) Wettst. -- accepted
  Euphrasia bottnica Kihlm. -- accepted
  Euphrasia brevipila Burnat & Gremli ex Gremli -- not accepted
  Euphrasia canadensis F. Towns. -- not accepted
  Euphrasia canadensis auct. non F. Towns. -- not accepted
  Euphrasia condensata Jord. -- not accepted
  Euphrasia curta (Fr.) Wettst. -- accepted
  Euphrasia disjuncta Fernald & Wiegand -- accepted -- polar eyebright
  Euphrasia disjuncta var. dolosa B. Boivin -- not accepted
  Euphrasia frigida Pugsley -- accepted -- coldweather eyebright
  Euphrasia frigida var. obtusata (Jørg.) Callen -- not accepted
  Euphrasia frigida var. submollis (Jørg.) Callen -- not accepted
  Euphrasia hudsoniana Fernald & Wiegand -- accepted -- Hudson Bay eyebright
  Euphrasia hudsoniana var. contracta P.D. Sell & Yeo -- accepted -- Hudson Bay eyebright
  Euphrasia hudsoniana var. hudsoniana Fernald & Wiegand -- accepted -- Hudson Bay eyebright
  Euphrasia hudsoniana var. ramosior P.D. Sell & Yeo -- accepted -- Hudson Bay eyebright
  Euphrasia micrantha Rchb. -- accepted -- northern eyebright
  Euphrasia mollis (Ledeb.) Wettst. -- accepted -- subalpine eyebright
  Euphrasia mollis var. laurentiana B. Boivin -- not accepted
  Euphrasia nemorosa (Pers.) Wallr. -- accepted -- common eyebright
  Euphrasia oakesii Wettst. -- accepted -- Oakes' eyebright
  Euphrasia officinalis auct. non L. -- not accepted
  Euphrasia ostenfeldii (Pugsley) Yeo -- accepted -- Ostenfeld's eyebright
  Euphrasia pectinata auct. non Ten. -- not accepted
  Euphrasia pennellii Callen -- not accepted
  Euphrasia purpurea Reeks -- not accepted
  Euphrasia randii B.L. Rob. -- accepted -- small eyebright
  Euphrasia randii var. farlowii B.L. Rob. -- not accepted
  Euphrasia randii var. reeksii Fernald -- not accepted
  Euphrasia rigidula Jord. -- not accepted
  Euphrasia rostkoviana Hayne -- not accepted -- eyebright
  Euphrasia salisburgensis Funck -- accepted -- Salisburg eyebright
  Euphrasia salisburgensis var. hibernica Pugsley -- accepted -- Salisburg eyebright
  Euphrasia stricta D. Wolff ex J.F. Lehm. -- accepted -- drug eyebright
  Euphrasia subarctica auct. non Raup -- not accepted
  Euphrasia subarctica Raup -- accepted -- arctic eyebright
  Euphrasia suborbicularis P.D. Sell & Yeo -- accepted -- roundleaf eyebright
  Euphrasia tatarica auct. non Fisch. ex Spreng. -- not accepted -- European eyebright
  Euphrasia tetraquetra (Brébiss.) Arrond. -- accepted -- maritime eyebright
  Euphrasia vinacea P.D. Sell & Yeo -- accepted -- glacier eyebright
  Euphrasia williamsii B.L. Rob. -- not accepted
  Euphrasia williamsii var. vestita Fernald & Wiegand -- not accepted
  Euphrasia X aequalis Callen -- accepted -- eyebright
  Euphrasia X aspera Callen -- not accepted
  Euphrasia X vestita Callen -- not accepted -- eyebright
  Euphrasia X villosa Callen -- not accepted -- villous eyebright
  Faradaya F. Muell. -- accepted
  Faradaya amicorum (Seem.) Seem. -- accepted
  Faradaya powellii Seem. ex Powell -- not accepted
  Flemingia grandiflora Roxb. ex Rottler -- not accepted
  Fontanesia Labill. -- accepted
  Fontanesia fortunei Carrière -- not accepted
  Fontanesia phillyreoides Labill. -- accepted -- Syrian-privet
  Fontanesia phillyreoides ssp. fortunei (Carrière) Yalt. -- accepted
  Forestiera Poir. -- accepted -- swamp privet, swampprivet
  Forestiera acuminata (Michx.) Poir. -- accepted -- swamp privet, Texas forestiera, eastern swampprivet
  Forestiera acuminata var. parviflora A. Gray -- not accepted
  Forestiera acuminata var. vestita Palmer -- not accepted
  Forestiera angustifolia Torr. -- accepted -- Texas forestiera, narrowleaf forestiera, Texas swampprivet
  Forestiera autumnalis (Michx.) Poir. -- not accepted
  Forestiera eggersiana Krug & Urb. -- accepted -- inkbush
  Forestiera globularis Small -- not accepted
  Forestiera godfreyi L.C. Anderson -- accepted -- Godfrey's swampprivet
  Forestiera ligustrina (Michx.) Poir. -- accepted -- privet, upland swampprivet
  Forestiera neomexicana A. Gray -- not accepted
  Forestiera neomexicana var. arizonica A. Gray -- not accepted
  Forestiera phillyreoides (Benth.) Torr. -- not accepted -- desert-olive forestiera
  Forestiera pinetorum Small -- not accepted
  Forestiera porulosa (Michx.) Poir. -- not accepted
  Forestiera puberula Eastw. -- not accepted
  Forestiera pubescens Nutt. -- accepted -- downy forestiera, desert olive, elbowbush, stretchberry
  Forestiera pubescens ssp. neomexicana (A. Gray) E.A. Murray -- not accepted
  Forestiera pubescens var. glabrifolia Shinners -- accepted -- stretchberry
  Forestiera pubescens var. neomexicana (A. Gray) E.A. Murray -- not accepted
  Forestiera pubescens var. pubescens Nutt. -- accepted -- stretchberry, New Mexico olive, New Mexico forestiera
  Forestiera reticulata Torr. -- accepted -- netleaf forestiera, netleaf swampprivet
  Forestiera rhamnifolia Griseb. -- accepted -- caca ravet
  Forestiera segregata (Jacq.) Krug & Urb. -- accepted -- Florida privet, Florida swampprivet
  Forestiera segregata var. pinetorum (Small) M.C. Johnst. -- accepted -- Florida swampprivet
  Forestiera segregata var. segregata (Jacq.) Krug & Urb. -- accepted -- Florida swampprivet
  Forestiera shrevei Standl. -- accepted -- desert-olive, desert olive
  Forestiera sphaerocarpa Torr. -- not accepted
  Forestiera texana Cory -- not accepted
  Forsythia Vahl -- accepted
  Forsythia europaea Degen & Bald. -- accepted
  Forsythia ovata Nakai -- accepted -- early forsythia
  Forsythia suspensa (Thunb.) Vahl -- accepted -- weeping forsythia
  Forsythia viridissima Lindl. -- accepted -- greenstem forsythia
  Forsythia X intermedia Zabel -- accepted -- showy forsythia
  Fraxinus L. -- accepted -- ash
  Fraxinus americana L. -- accepted -- white ash
  Fraxinus americana ssp. texensis (A. Gray) G.N. Mill. -- not accepted
  Fraxinus americana var. biltmoreana (Beadle) J. Wright ex Fernald -- not accepted
  Fraxinus americana var. crassifolia Sarg. -- not accepted
  Fraxinus americana var. curtissii (Vasey) Small -- not accepted
  Fraxinus americana var. juglandifolia (Lam.) Rehder -- not accepted
  Fraxinus americana var. microcarpa A. Gray -- not accepted
  Fraxinus americana var. texensis A. Gray -- not accepted
  Fraxinus anomala Torr. ex S. Watson -- accepted -- singleleaf ash
  Fraxinus anomala var. anomala Torr. ex S. Watson -- accepted -- singleleaf ash
  Fraxinus anomala var. lowellii (Sarg.) Little -- accepted -- Lowell ash, singleleaf ash
  Fraxinus berlandierana DC. -- not accepted
  Fraxinus berlandieriana DC. -- accepted -- Mexican ash
  Fraxinus biltmoreana Beadle -- not accepted
  Fraxinus campestris Britton -- not accepted
  Fraxinus caroliniana Mill. -- accepted -- Carolina ash
  Fraxinus caroliniana var. cubensis (Griseb.) Lingelsh. -- not accepted
  Fraxinus caroliniana var. oblanceolata (M.A. Curtis) Fernald & B.G. Schub. -- not accepted
  Fraxinus chinensis Roxb. -- accepted -- Chinese ash
  Fraxinus cuspidata Torr. -- accepted -- fragrant ash
  Fraxinus cuspidata var. macropetala (Eastw.) Rehder -- not accepted -- large-petaled ash
  Fraxinus darlingtonii Britton -- not accepted
  Fraxinus dipetala Hook. & Arn. -- accepted -- two-petal ash, California ash
  Fraxinus dipetala var. trifoliolata Torr. -- not accepted
  Fraxinus excelsior L. -- accepted -- European ash
  Fraxinus gooddingii Little -- accepted -- Goodding's ash
  Fraxinus greggii A. Gray -- accepted -- Gregg's ash
  Fraxinus jonesii Lingelsh. -- not accepted
  Fraxinus lanceolata Borkh. -- not accepted
  Fraxinus latifolia Benth. -- accepted -- Oregon ash
  Fraxinus lowellii Sarg. -- not accepted
  Fraxinus mandshurica Rupr. -- accepted -- Manchurian ash
  Fraxinus mariesii Hook. f. -- not accepted -- Maries' ash
  Fraxinus michauxii Britton -- not accepted
  Fraxinus nigra Marsh. -- accepted -- black ash
  Fraxinus oregona Nutt. -- not accepted
  Fraxinus ornus L. -- accepted -- flowering ash
  Fraxinus papillosa Lingelsh. -- accepted -- Chihuahuan ash
  Fraxinus pauciflora Nutt. -- not accepted
  Fraxinus pennsylvanica Marsh. -- accepted -- green ash
  Fraxinus pennsylvanica ssp. oregona (Nutt.) G.N. Mill. -- not accepted
  Fraxinus pennsylvanica ssp. velutina (Torr.) G.N. Mill. -- not accepted
  Fraxinus pennsylvanica var. austinii Fernald -- not accepted
  Fraxinus pennsylvanica var. integerrima (Vahl) Fernald -- not accepted
  Fraxinus pennsylvanica var. lanceolata (Borkh.) Sarg. -- not accepted
  Fraxinus pennsylvanica var. pennsylvanica Marsh. -- not accepted -- green ash
  Fraxinus pennsylvanica var. subintegerrima (Vahl) Fernald -- not accepted
  Fraxinus profunda (Bush) Bush -- accepted -- pumpkin ash
  Fraxinus quadrangulata Michx. -- accepted -- blue ash
  Fraxinus smallii Britton -- not accepted
  Fraxinus texensis (A. Gray) Sarg. -- accepted -- Texas ash
  Fraxinus tomentosa Michx. f. -- not accepted
  Fraxinus trifoliata (Torr.) F.H. Lewis & Epling -- not accepted
  Fraxinus trifoliolata (Torr.) F.H. Lewis & Epling -- not accepted
  Fraxinus uhdei (Wenz.) Lingelsh. -- accepted -- Mexican ash, tropical ash, shamel ash
  Fraxinus velutina Torr. -- accepted -- velvet ash
  Fraxinus velutina var. coriacea (S. Watson) Rehder -- not accepted
  Fraxinus velutina var. glabra Rehder -- not accepted
  Fraxinus velutina var. toumeyi (Britton) Rehder -- not accepted
  Galeopsis L. -- accepted -- hempnettle
  Galeopsis angustifolia Ehrh. ex Hoffm. -- accepted -- narrowleaf hempnettle
  Galeopsis bifida Boenn. -- accepted -- split-lip hemp-nettle, splitlip hempnettle
  Galeopsis ladanum L. -- accepted -- red hempnettle
  Galeopsis ladanum var. angustifolia (Ehrh. ex Hoffm.) Wallr. -- not accepted
  Galeopsis ladanum var. ladanum L. -- accepted -- red hempnettle
  Galeopsis ladanum var. latifolia (Hoffm.) Wallr. -- accepted -- red hempnettle
  Galeopsis pubescens Besser -- accepted -- hairy hempnettle
  Galeopsis segetum Neck. -- accepted -- hempnettle
  Galeopsis speciosa Mill. -- accepted -- Edmonton hempnettle
  Galeopsis tetrahit L. -- accepted -- bristlestem hempnettle, brittle-stem hemp-nettle, brittlestem hempnettle
  Galeopsis tetrahit var. arvensis Schltdl. -- accepted -- brittlestem hempnettle
  Galeopsis tetrahit var. bifida (Boenn.) Lej. & Courtois -- not accepted
  Galeopsis tetrahit var. tetrahit L. -- accepted -- brittlestem hempnettle
  Galeopsis versicolor W.M. Curtis -- not accepted
  Galeopsis villosa Huds. -- not accepted
  Galvezia Dombey ex Juss. -- accepted
  Galvezia speciosa (Nutt.) A. Gray -- not accepted -- island snapdragon
  Gambelia Nutt. -- accepted -- greenbright
  Gambelia speciosa Nutt. -- accepted -- showy greenbright
  Gatesia laetevirens (Buckley) A. Gray -- not accepted
  Gerardia Benth. -- not accepted
  Gerardia acuta (Pennell) Pennell -- not accepted
  Gerardia aphylla Nutt. -- not accepted
  Gerardia aphylla var. grandiflora Benth. -- not accepted
  Gerardia aspera Douglas ex Benth. -- not accepted
  Gerardia auriculata Michx. -- not accepted
  Gerardia barbata (Torr. & A. Gray) S.F. Blake -- not accepted
  Gerardia besseyana Britton -- not accepted
  Gerardia caddoensis (Pennell) Pennell -- not accepted
  Gerardia calycina (Pennell) Pennell -- not accepted
  Gerardia calycosa (Mack. & Bush) Fernald -- not accepted
  Gerardia decemloba Greene -- not accepted
  Gerardia densiflora Benth. -- not accepted
  Gerardia dispersa (Small) K. Schum. -- not accepted
  Gerardia divaricata Chapm. -- not accepted
  Gerardia dulcis (Cav.) Nees -- not accepted
  Gerardia dulcis var. floridana (A. Gray) S.F. Blake -- not accepted
  Gerardia edwardsiana (Pennell) Pennell -- not accepted
  Gerardia edwardsiana ssp. glabra (Pennell) Pennell -- not accepted
  Gerardia edwardsiana ssp. typica Pennell -- not accepted
  Gerardia fasciculata Elliott -- not accepted
  Gerardia fasciculata ssp. peninsularis (Pennell) Pennell -- not accepted
  Gerardia filicaulis (Benth.) Chapm. -- not accepted
  Gerardia filifolia Nutt. -- not accepted
  Gerardia filifolia var. gatesii Benth. -- not accepted
  Gerardia flava L. -- not accepted
  Gerardia flava var. calycosa (Mack. & Bush) Steyerm. -- not accepted
  Gerardia flava var. macrantha (Pennell) Fernald -- not accepted
  Gerardia flava var. reticulata (Raf.) Cory -- not accepted
  Gerardia floridana (A. Gray) Small -- not accepted
  Gerardia gatesii (Benth.) Pennell -- not accepted
  Gerardia gattingeri Small -- not accepted
  Gerardia georgiana C.L. Boynt. -- not accepted
  Gerardia grandiflora Benth. -- not accepted
  Gerardia grandiflora var. cinerea (Pennell) Cory -- not accepted
  Gerardia grandiflora var. pulchra (Pennell) Fernald -- not accepted
  Gerardia grandiflora var. serrata (Torr. ex Benth.) B.L. Rob. -- not accepted
  Gerardia heterophylla Nutt. -- not accepted
  Gerardia homalantha (Pennell) Pennell -- not accepted
  Gerardia keyensis (Pennell) Pennell -- not accepted
  Gerardia laevigata Raf. -- not accepted
  Gerardia laxa (Pennell) Pennell -- not accepted
  Gerardia leucanthera Raf. -- not accepted
  Gerardia levigata Raf. -- not accepted
  Gerardia linifolia Nutt. -- not accepted
  Gerardia longifolia Nutt. -- not accepted
  Gerardia maritima Raf. -- not accepted
  Gerardia maritima ssp. grandiflora (Benth.) Pennell -- not accepted
  Gerardia maritima var. grandiflora Benth. -- not accepted
  Gerardia microphylla (A. Gray) Small -- not accepted
  Gerardia neoscotica Greene -- not accepted
  Gerardia obtusifolia (Raf.) Pennell -- not accepted
  Gerardia parvifolia Chapm. -- not accepted
  Gerardia patula (Chapm.) A. Gray -- not accepted
  Gerardia paupercula (A. Gray) Britton -- not accepted
  Gerardia paupercula ssp. borealis (Pennell) Pennell -- not accepted
  Gerardia paupercula var. borealis (Pennell) Deam -- not accepted
  Gerardia paupercula var. typica Pennell -- not accepted
  Gerardia pectinata (Nutt.) Benth. -- not accepted
  Gerardia pedicularia L. -- not accepted
  Gerardia pedicularia var. ambigens Fernald -- not accepted
  Gerardia pedicularia var. austromontana (Pennell) Fernald -- not accepted
  Gerardia pedicularia var. intercedens (Pennell) Fernald -- not accepted
  Gerardia pedicularia var. pectinata Nutt. -- not accepted
  Gerardia plukenetii Elliott -- not accepted
  Gerardia plukenetii var. microphylla A. Gray -- not accepted
  Gerardia polyphylla Small -- not accepted
  Gerardia portoricensis Britton & P. Wilson -- not accepted
  Gerardia pseudaphylla (Pennell) Pennell -- not accepted
  Gerardia pulchella Pennell -- not accepted
  Gerardia pulchella var. delicatula (Pennell) Pennell -- not accepted
  Gerardia pulcherrima Pennell -- not accepted
  Gerardia purpurea L. -- not accepted
  Gerardia purpurea ssp. parvula Pennell -- not accepted
  Gerardia purpurea var. carteri (Pennell) Pennell -- not accepted
  Gerardia purpurea var. grandiflora Benth. -- not accepted
  Gerardia purpurea var. neoscotica (Greene) Gleason -- not accepted
  Gerardia purpurea var. parviflora Benth. -- not accepted
  Gerardia purpurea var. paupercula A. Gray -- not accepted
  Gerardia purpurea var. racemulosa (Pennell) Gleason -- not accepted
  Gerardia racemulosa Pennell -- not accepted
  Gerardia setacea J.F. Gmel. -- not accepted
  Gerardia setacea var. parvifolia Benth. -- not accepted
  Gerardia skinneriana Alph. Wood -- not accepted
  Gerardia spiciflora Engelm. -- not accepted
  Gerardia stenophylla (Pennell) Pennell -- not accepted
  Gerardia strictifolia Benth. -- not accepted
  Gerardia tenella (Pennell) Pennell -- not accepted
  Gerardia tenuifolia Vahl -- not accepted
  Gerardia tenuifolia ssp. leucanthera (Raf.) Pennell -- not accepted
  Gerardia tenuifolia ssp. macrophylla (Benth.) Pennell -- not accepted
  Gerardia tenuifolia ssp. parviflora (Nutt.) Pennell -- not accepted
  Gerardia tenuifolia ssp. polyphylla (Small) Pennell -- not accepted
  Gerardia tenuifolia var. humilis Benth. -- not accepted
  Gerardia tenuifolia var. leucanthera (Raf.) Shinners -- not accepted
  Gerardia tenuifolia var. macrophylla Benth. -- not accepted
  Gerardia tenuifolia var. parviflora Nutt. -- not accepted
  Gerardia tenuifolia var. polyphylla (Small) Shinners -- not accepted
  Gerardia tenuifolia var. typica Pennell -- not accepted
  Gerardia tuberosa L. -- not accepted
  Gerardia virginica (L.) Britton, Sterns & Poggenb. -- not accepted
  Gerardia viridis Small -- not accepted
  Gesneria Plum. ex L. -- accepted
  Gesneria citrina Urb. -- accepted -- yerba Puerto Rico de cueva
  Gesneria cuneifolia (DC.) Fritsch -- accepted -- yerba parrera
  Gesneria pauciflora Urb. -- accepted -- yerba maricao de cueva
  Gesneria pedunculosa (DC.) Fritsch -- accepted -- arbol de Navidad
  Gesneria reticulata (Griseb.) Urb. -- accepted -- yerba neto hoja de cueva
  Gesneria sintenisii Urb. -- not accepted
  Gesneria viridiflora (Decne.) Kuntze -- accepted -- grassflower
  Gesneria viridiflora ssp. sintenisii (Urb.) L.E. Skog -- accepted -- grassflower
  Gesneria viridiflora ssp. viridiflora (Decne.) Kuntze -- accepted
  Gesneria viridiflora var. viridiflora (Decne.) Kuntze -- not accepted
  Gesneriaceae -- accepted -- gesnerias
  Ghinia Schreb. -- not accepted
  Ghinia boxiana Moldenke -- not accepted
  Ghinia spinosa (Sw.) Britton & P. Wilson -- not accepted
  Glandularia J.F. Gmel. -- accepted -- mock vervain
  Glandularia bipinnatifida (Nutt.) Nutt. -- accepted -- Dakota mock vervain
  Glandularia bipinnatifida var. bipinnatifida (Nutt.) Nutt. -- accepted -- Dakota verbena, Dakota mock vervain
  Glandularia bipinnatifida var. brevispicata Umber -- not accepted -- Dakota mock vervain
  Glandularia bipinnatifida var. ciliata (Benth.) B.L. Turner -- accepted -- Davis Mountain mock vervain
  Glandularia canadensis (L.) Nutt. -- accepted -- rose verbena, rose mock vervain
  Glandularia chamaedryfolia Juss. -- not accepted
  Glandularia chiricahensis Umber -- accepted -- Chiricahua mock vervain, Chiricahua Mountain mock vervain
  Glandularia delticola (Small) Umber -- accepted -- moradia
  Glandularia drummondii (Lindl.) Small -- not accepted
  Glandularia elegans (Kunth) Umber -- accepted -- mountain mock vervain
  Glandularia elegans var. asperata (L.M. Perry) Umber -- accepted -- mountain mock vervain
  Glandularia elegans var. elegans (Kunth) Umber -- accepted -- mountain mock vervain, fringed verbena
  Glandularia gooddingii (Briq.) Solbrig -- accepted -- Goodding's verbena, desert vervain, southwestern mock vervain
  Glandularia hispida Ruiz & Pav. -- accepted -- hispid mock vervain
  Glandularia incisa (Hook.) Tronc. -- accepted -- crisped mock vervain
  Glandularia lambertii (Sims) Small -- not accepted
  Glandularia maritima (Small) Small -- accepted -- coastal mock vervain
  Glandularia peruviana (L.) Small -- accepted -- Peruvian mock vervain
  Glandularia polyantha Umber -- accepted -- Rio Grande mock vervain
  Glandularia pulchella (Sweet) Tronc. -- accepted -- South American mock vervain
  Glandularia pumila (Rydb.) Umber -- accepted -- pink verbena, pink mock vervain
  Glandularia quadrangulata (A. Heller) Umber -- accepted -- beaked mock vervain
  Glandularia quadrangulata f. albida (Moldenke) B.L. Turner -- accepted -- Chihuahuan mock vervain
  Glandularia quandrangulata (A. Heller) Umber -- not accepted
  Glandularia racemosa (Eggert) Umber -- accepted -- pale mock vervain
  Glandularia tampensis (Nash) Small -- accepted -- Tampa mock vervain
  Glandularia tenera (Spreng.) Cabrera -- accepted -- Latin American mock vervain
  Glandularia tenuisecta (Briq.) Small -- not accepted
  Glandularia tumidula (L.M. Perry) Umber -- accepted -- plains mock vervain
  Glandularia verecunda Umber -- not accepted -- Chihuahuan mock vervain
  Glandularia wrightii (A. Gray) Umber -- not accepted -- Wright's verbena, Davis Mountain mock vervain
  Glandularia X hybrida (Groenland & Rümpler) G.L. Nesom & Pruski -- accepted
  Glechoma L. -- accepted
  Glechoma hederacea L. -- accepted -- creeping charlie, gill-over-the-ground, haymaids, groundivy, ground ivy
  Glechoma hederacea var. hederacea L. -- not accepted -- groundivy
  Glechoma hederacea var. micrantha Moric. -- not accepted -- groundivy
  Glechoma hederacea var. parviflora (Benth.) House -- not accepted
  Glecoma L. -- not accepted
  Glecoma hederacea L. -- not accepted
  Globifera umbrosa J.F. Gmel. -- not accepted
  Glossostigma Wight & Arn. -- accepted
  Glossostigma cleistanthum W.R. Barker -- accepted -- mudmats
  Glossostigma diandrum (L.) Kunze -- accepted -- mudmats
  Glossostylis aspera Cham. & Schltdl. -- not accepted
  Gloxinia L'Hér. -- accepted
  Gloxinia perennis (L.) Fritsch -- accepted -- Canterbury bells
  Gmelina L. -- accepted
  Gmelina arborea Roxb. -- accepted -- gumhar
  Gmelina asiatica L. -- accepted -- Asian bushbeech
  Gmelina philippensis Cham. -- accepted -- wild sage
  Goniostachyum citrosum Small -- not accepted
  Graptophyllum Nees -- accepted
  Graptophyllum pictum (L.) Griff. -- accepted -- caricature-plant
  Gratiola L. -- accepted -- hedge hyssop, hedgehyssop
  Gratiola aurea Pursh -- accepted -- golden hedge-hyssop, golden hedgehyssop
  Gratiola aurea var. obtusa Pennell -- not accepted
  Gratiola brevifolia Raf. -- accepted -- sticky hedgehyssop
  Gratiola dubia L. -- not accepted
  Gratiola ebracteata Benth. ex A. DC. -- accepted -- bractless hedgehyssop
  Gratiola flava Leavenworth -- accepted -- yellow hedgehyssop
  Gratiola floridana Nutt. -- accepted -- Florida hedgehyssop
  Gratiola heterosepala H. Mason & Bacig. -- accepted -- Boggs Lake hedge-hyssop
  Gratiola hispida (Benth. ex Lindl.) Pollard -- accepted -- rough hedgehyssop
  Gratiola lutea Raf. -- not accepted
  Gratiola neglecta Torr. -- accepted -- clammy hedgehyssop, clammy hedge-hyssop, drug hedgehyssop, neglected hedgehyssop, hedge hyssop
  Gratiola neglecta var. glaberrima (Fernald) Fernald -- not accepted -- gratiole négligée variété du Saint-Laurent
  Gratiola officinalis L. -- accepted -- hedgehyssop
  Gratiola pilosa Michx. -- accepted -- shaggy hedgehyssop
  Gratiola pilosa var. epilis Pennell -- not accepted
  Gratiola ramosa Walter -- accepted -- branched hedgehyssop
  Gratiola repens Sw. -- not accepted
  Gratiola sphaerocarpa Elliott -- not accepted
  Gratiola subulata Baldwin ex Benth. -- not accepted
  Gratiola virginiana L. -- accepted -- roundfruit hedgehyssop, Virginia hedgehyssop
  Gratiola virginiana var. aestuariorum Pennell -- accepted -- roundfruit hedgehyssop
  Gratiola virginiana var. virginiana L. -- accepted -- roundfruit hedgehyssop
  Gratiola viscidula Pennell -- accepted -- Short's hedgehyssop
  Gratiola viscidula ssp. shortii Durand ex Pennell -- not accepted
  Gratiola viscidula var. shortii (Durand ex Pennell) Gleason -- not accepted
  Gratiola viscosa Schwein. -- not accepted
  Haenianthus Griseb. -- accepted
  Haenianthus obovatus Krug & Urb. -- not accepted
  Haenianthus salicifolius Griseb. -- accepted -- palo de hueso
  Haenianthus salicifolius var. obovatus (Krug & Urb.) Knobl. -- accepted -- palo de hueso
  Haenianthus salicifolius var. salicifolius Griseb. -- accepted -- palo de hueso
  Handroanthus Mattos -- accepted
  Handroanthus capitatus (Bureau ex. K. Schum.) Mattos -- accepted -- arawnig
  Handroanthus chrysanthus (Jacq.) S.O. Grose -- accepted -- roble amarillo
  Handroanthus serratifolius (Vahl) S.O. Grose -- accepted -- yellow poui
  Haplostachys (A. Gray) Hillebr. -- accepted
  Haplostachys bryanii Sherff -- accepted -- Molokai islandmint
  Haplostachys bryanii var. microdonta Sherff -- not accepted
  Haplostachys bryanii var. robusta Sherff -- not accepted
  Haplostachys haplostachya (A. Gray) H. St. John -- accepted -- honohono
  Haplostachys haplostachya var. angustifolia (Sherff) H. St. John -- not accepted
  Haplostachys haplostachya var. leptostachya (Hillebr.) H. St. John -- not accepted
  Haplostachys linearifolia (Drake) Sherff -- accepted -- woodland islandmint
  Haplostachys linearifolia var. rosmarinifolia (Hillebr.) Sherff -- not accepted
  Haplostachys munroi C.N. Forbes -- accepted -- Lanai islandmint
  Haplostachys truncata (A. Gray) Hillebr. -- accepted -- Maui islandmint
  Harpagophytum DC. ex Meisn. -- accepted
  Harpagophytum procumbens (Burch.) DC. ex Meisn. -- accepted -- devil's-claw
  Hebe Comm. ex Juss. -- accepted
  Hebe speciosa (R. Cunn. ex A. Cunn.) Andersen -- accepted -- New Zealand hebe
  Hebe venustula (Colenso) Cockayne -- accepted
  Hebe X franciscana (Eastw.) Souster -- accepted -- Francisco hebe
  Hedeoma Pers. -- accepted -- falsepennyroyal, pennyroyal, false pennyroyal
  Hedeoma acinoides Scheele -- accepted -- slender hedeome, slender false pennyroyal
  Hedeoma angulata Tharp -- not accepted
  Hedeoma apiculata W.S. Stewart -- accepted -- falsepennyroyal, McKittrick's false pennyroyal
  Hedeoma apiculatum W.S. Stewart -- not accepted -- McKittrick pennyroyal
  Hedeoma arkansana Nutt. -- not accepted
  Hedeoma blepharodonta Greene -- not accepted
  Hedeoma campora Rydb. -- not accepted
  Hedeoma ciliata (Benth.) Benth. ex A. DC. -- not accepted
  Hedeoma ciliata Nutt. -- not accepted
  Hedeoma convisae A. Nelson -- not accepted
  Hedeoma costata Hemsl. -- accepted -- false pennyroyal, falsepennyroyal, ribbed false pennyroyal
  Hedeoma costata var. costata Hemsl. -- accepted -- falsepennyroyal, ribbed false pennyroyal
  Hedeoma costata var. pulchella (Greene) Irving -- accepted -- ribbed false pennyroyal, false pennyroyal, falsepennyroyal
  Hedeoma costatum Hemsl. -- not accepted
  Hedeoma costatum var. costatum Hemsl. -- not accepted
  Hedeoma costatum var. puchellum (Greene) Irving -- not accepted
  Hedeoma dentata Torr. -- accepted -- dentate falsepennyroyal, dentate false pennyroyal
  Hedeoma dentatum Torr. -- not accepted
  Hedeoma diffusa Greene -- accepted -- spreading false pennyroyal
  Hedeoma diffusum Greene -- not accepted -- Flagstaff pennyroyal
  Hedeoma drummondii Benth. -- accepted -- Drummond's pennyroyal, Drummond's false pennyroyal
  Hedeoma drummondii var. crenulata Irving -- not accepted
  Hedeoma drummondii var. reverchonii A. Gray -- not accepted
  Hedeoma glabra Nutt. -- not accepted
  Hedeoma glabrescens (A. Gray) Briq. -- not accepted
  Hedeoma graveolens Chapm. ex A. Gray -- not accepted -- mock pennyroyal
  Hedeoma hispida Pursh -- accepted -- rough pennyroyal, false pennyroyal, falsepennyroyal, rough falsepennyroyal, rough false pennyroyal
  Hedeoma hispidum Pursh -- not accepted
  Hedeoma hyssopifolia A. Gray -- accepted -- mock pennyroyal, falsepennyroyal, aromatic false pennyroyal
  Hedeoma hyssopifolium A. Gray -- not accepted
  Hedeoma incana Torr. -- not accepted
  Hedeoma lata Small -- not accepted
  Hedeoma longiflora Rydb. -- not accepted
  Hedeoma molle Torr. -- not accepted
  Hedeoma mollis Torr. -- accepted -- falsepennyroyal, softhair false pennyroyal
  Hedeoma nana (Torr.) Briq. -- accepted -- false pennyroyal, dwarf pennyroyal, dwarf false pennyroyal
  Hedeoma nana ssp. californica W.S. Stewart -- accepted -- California falsepennyroyal, California false pennyroyal
  Hedeoma nana ssp. macrocalyx W.S. Stewart -- accepted -- false pennyroyal, dwarf false pennyroyal
  Hedeoma nana ssp. nana (Torr.) Briq. -- accepted -- false pennyroyal, falsepennyroyal, dwarf false pennyroyal
  Hedeoma nana ssp. typica W.S. Stewart -- not accepted
  Hedeoma nanum (Torr.) Briq. -- not accepted
  Hedeoma oblongifolia (A. Gray) A. Heller -- accepted -- falsepennyroyal, false pennyroyal, oblongleaf false pennyroyal
  Hedeoma oblongifolium (A. Gray) A. Heller -- not accepted
  Hedeoma ovata A. Nelson -- not accepted
  Hedeoma pilosa R.S. Irving -- accepted -- falsepennyroyal, old blue false pennyroyal
  Hedeoma pilosum Irving -- not accepted -- old blue mock pennyroyal
  Hedeoma piperita var. oblongifolia A. Gray -- not accepted
  Hedeoma plicata Torr. -- accepted -- falsepennyroyal, veiny false pennyroyal
  Hedeoma plicatum Torr. -- not accepted
  Hedeoma pulchella Greene -- not accepted
  Hedeoma pulcherrima Wooton & Standl. -- accepted -- White Mountain false pennyroyal
  Hedeoma pulcherrimum Wooton & Standl. -- not accepted
  Hedeoma pulegioides (L.) Pers. -- accepted -- American false pennyroyal
  Hedeoma reverchonii (A. Gray) A. Gray -- accepted -- Reverchon's falsepennyroyal, Reverchon's false pennyroyal
  Hedeoma reverchonii var. reverchonii (A. Gray) A. Gray -- accepted -- Reverchon's falsepennyroyal, Reverchon's false pennyroyal
  Hedeoma reverchonii var. serpyllifolia (Small) Irving -- accepted -- Reverchon's falsepennyroyal, Reverchon's false pennyroyal
  Hedeoma reverchonii var. serpyllifolium (Small) Irving -- not accepted
  Hedeoma sancta Small -- not accepted
  Hedeoma serpyllifolia Small -- not accepted
  Hedeoma serpylloides Torr. -- not accepted
  Hedeoma tenella Hemsl. -- not accepted
  Hedeoma texana Cory -- not accepted
  Hedeoma thymoides A. Gray -- not accepted
  Hedeoma thymoides var. oblongifolia (A. Gray) A. Gray -- not accepted
  Hedeoma todsenii R.S. Irving -- accepted -- Todsen's pennyroyal, Todsen's false pennyroyal
  Hemianthus Nutt. -- not accepted
  Hemianthus callitrichoides Griseb. -- not accepted
  Hemianthus glomeratus (Chapm.) Pennell -- not accepted
  Hemianthus micranthemoides Nutt. -- not accepted
  Hemichaena Benth. -- accepted
  Hemichaena fruticosa Benth. -- accepted
  Hemigraphis Nees -- accepted
  Hemigraphis alternata (Burm. f.) T. Anderson -- accepted -- redivy
  Hemigraphis reptans (G. Forst.) T. Anderson ex Hemsl. -- accepted -- redflame
  Henrya Nees ex Benth. -- accepted
  Henrya brevifolia Happ -- not accepted
  Henrya insularis Nees ex Benth. -- accepted -- island-renegade, island renegade
  Herpestis rotundifolia C.F. Gaertn. -- not accepted
  Hippuris L. -- accepted -- mare's-tail
  Hippuris lanceolata Retz. -- accepted
  Hippuris montana Ledeb. ex Rchb. -- accepted -- mountain mare's-tail
  Hippuris tetraphylla L. f. -- accepted -- fourleaf mare's-tail
  Hippuris vulgaris L. -- accepted -- common mare's-tail, common mare's tail
  Holmgrenanthe Elisens -- accepted -- rocklady
  Holmgrenanthe petrophila (Coville & C.V. Morton) Elisens -- accepted -- rock lady
  Holmskioldia Retz. -- accepted
  Holmskioldia sanguinea Retz. -- accepted -- Chinese hatplant
  Holographis Nees -- accepted
  Holographis virgata (Harv. ex Benth. & Hook. f.) T.F. Daniel -- accepted -- white devilbush
  Hottonia indica L. -- not accepted
  Howelliella Rothm. -- accepted
  Howelliella ovata (Eastw.) Rothm. -- accepted -- ovateleaf snapdragon
  Hydranthelium rotundifolium (Michx.) Pennell -- not accepted
  Hydrotrida caroliniana (Walter) Small -- not accepted
  Hygrophila R. Br. -- accepted -- swampweed
  Hygrophila angustifolia R. Br. -- not accepted
  Hygrophila auriculata (Schumach.) Heine -- accepted
  Hygrophila brasiliensis (Spreng.) Lindau -- not accepted -- yerba de hicotea
  Hygrophila corymbosa (Blume) Lindau -- accepted -- starhorn
  Hygrophila costata Nees & T. Nees -- accepted -- yerba de hicotea
  Hygrophila lacustris (Schltdl. & Cham.) Nees -- accepted -- gulf swampweed
  Hygrophila polysperma (Roxb.) T. Anderson -- accepted -- East Indian hygrophila, Miramar weed, Indian swampweed
  Hygrophila portoricensis Nees -- not accepted
  Hygrophila salicifolia (Vahl) Nees -- not accepted
  Hygrophila triflora (Roxb.) Fosberg & Sachet -- accepted
  Hypoestes Sol. ex R. Br. -- accepted
  Hypoestes phyllostachya Baker -- accepted -- polkadot-plant
  Hypogon verticillata (Baldw.) House -- not accepted
  Hypogon verticillata Raf. -- not accepted
  Hyptis Jacq. -- accepted -- bushmint
  Hyptis alata (Raf.) Shinners -- accepted -- clustered bushmint
  Hyptis alata var. stenophylla Shinners -- not accepted
  Hyptis americana (Poit.) Briq. -- accepted -- American bushmint
  Hyptis americana (Aubl.) Urb. -- not accepted -- American bushmint
  Hyptis atrorubens Poit. -- accepted -- marubio oscuro
  Hyptis capitata Jacq. -- accepted -- false ironwort
  Hyptis emoryi Torr. -- accepted -- desert lavender
  Hyptis escobilla Urb. -- accepted -- bayamon
  Hyptis lantanifolia Poit. -- accepted -- island bushmint
  Hyptis mutabilis (Rich.) Briq. -- accepted -- tropical bushmint
  Hyptis mutabilis var. spicata (Poit.) Briq. -- not accepted
  Hyptis pectinata (L.) Poit. -- accepted -- comb hyptis, fausse menthe, mint weed, mumutun lahe, purple top, timothi ni vavalangi, comb bushmint
  Hyptis radiata Willd. -- not accepted
  Hyptis scoparia Poit. -- not accepted
  Hyptis spicigera Lam. -- accepted -- marubio
  Hyptis suaveolens (L.) Poit. -- accepted -- mumutun, wild spikenard, pignut
  Hyptis verticillata Jacq. -- accepted -- John Charles
  Hyssopus L. -- accepted
  Hyssopus officinalis L. -- accepted -- hyssop
  Ibicella Van Eselt. -- accepted -- yellow unicorn-plant
  Ibicella lutea (Lindl.) Van Eselt. -- accepted -- yellow unicorn-plant
  Ilysanthes Raf. -- not accepted
  Ilysanthes anagallidea (Michx.) B.L. Rob. -- not accepted
  Ilysanthes attenuata (Spreng.) Small -- not accepted
  Ilysanthes dubia (L.) Barnhart -- not accepted
  Ilysanthes grandiflora (Nutt.) Benth. -- not accepted
  Ilysanthes inequalis (Walter) Pennell -- not accepted
  Ilysanthes monticola (Nutt.) Raf. -- not accepted
  Ilysanthes saxicola (M.A. Curtis) Chapm. -- not accepted
  Incarvillea Juss. -- accepted
  Incarvillea delavayi Bureau & Franch. -- accepted
  Incarvillea olgae Regel -- accepted
  Isanthus Michx. -- not accepted -- fluxweed
  Isanthus brachiatus (L.) Britton, Sterns & Poggenb. -- not accepted -- false pennyroyal, fluxweed
  Isanthus brachiatus var. linearis Fassett -- not accepted
  Jacaranda Juss. -- accepted -- jacaranda
  Jacaranda acutifolia auct. non Humb. & Bonpl. -- not accepted
  Jacaranda mimosifolia D. Don -- accepted -- black poui
  Jacobinia candicans (Nees) Benth. & Hook. f. -- not accepted
  Jacobinia carnea (Lindl.) G. Nicholson -- not accepted
  Jacobinia ovata A. Gray -- not accepted
  Jasminum L. -- accepted -- jasmine
  Jasminum amplexicaule Buch.-Ham. ex G. Don -- not accepted
  Jasminum azoricum auct. non L. -- not accepted
  Jasminum dichotomum Vahl -- accepted -- Gold Coast jasmine
  Jasminum elongatum (P.J. Bergius) Willd. -- accepted -- earleaf jasmine
  Jasminum fluminense Vell. -- accepted -- Brazilian jasmine, jazmin de trapo
  Jasminum grandiflorum L. -- accepted
  Jasminum laurifolium Roxb. -- accepted
  Jasminum marianum DC. -- accepted
  Jasminum mesnyi Hance -- accepted -- Japanese jasmine
  Jasminum multiflorum (Burm. f.) Andrews -- accepted -- star jasmine
  Jasminum nitidum Skan -- accepted -- angelwing jasmine
  Jasminum nudiflorum Lindl. -- accepted -- winter jasmine
  Jasminum officinale L. -- accepted -- poet's jasmine
  Jasminum officinale var. grandiflorum (L.) L.H. Bailey -- not accepted
  Jasminum primulinum Hemsl. -- not accepted
  Jasminum pubescens (Retz.) Willd. -- not accepted
  Jasminum sambac (L.) Aiton -- accepted -- pikake, Arabian jasmine
  Jasminum undulatum Ker Gawl. -- not accepted
  Justica paniculata Burm. f. -- not accepted
  Justicia L. -- accepted -- water-willow
  Justicia adhatoda L. -- accepted -- Malabar nut
  Justicia americana (L.) Vahl -- accepted -- spike justica, common water-willow, carmantine d'Amérique, American water-willow
  Justicia americana var. subcoriacea Fernald -- not accepted
  Justicia androsaemifolia (Nees) Lindau -- accepted
  Justicia angusta (Chapm.) Small -- accepted -- pineland water-willow
  Justicia assurgens L. -- not accepted
  Justicia betonica L. -- accepted -- squirrel's tail
  Justicia borinquensis Britton -- not accepted -- Monte Cerrote water-willow
  Justicia brachiata Pursh -- not accepted
  Justicia brandegeeana Wassh. & L.B. Sm. -- accepted -- shrimpplant
  Justicia brunelloides Lam. -- not accepted
  Justicia californica (Benth.) D.N. Gibson -- accepted -- beloperone
  Justicia candicans (Nees) L.D. Benson -- accepted -- jacobina, Arizona water-willow
  Justicia candicans var. subglabra (S. Watson) L.D. Benson -- not accepted
  Justicia carnea Lindl. -- accepted -- Brazilian-plume
  Justicia carthagenensis Jacq. -- accepted -- woodland water-willow
  Justicia carthaginensis Jacq. -- not accepted
  Justicia comata (L.) Lam. -- accepted -- marsh water-willow
  Justicia cooleyi Monach. & Leonard -- accepted -- Cooley's water-willow
  Justicia crassifolia (Chapm.) Chapm. ex Small -- accepted -- thick-leaved water-willow, thickleaf water-willow
  Justicia culebritae Urb. -- accepted -- Culebrita Island water-willow
  Justicia echioides L. -- not accepted
  Justicia gangetica L. -- not accepted
  Justicia humilis Michx. -- not accepted
  Justicia imbricata Vahl -- not accepted
  Justicia laetevirens Buckley -- not accepted
  Justicia lanceolata (Chapm.) Small -- not accepted
  Justicia longii Hilsenb. -- accepted -- longflower tube tongue
  Justicia martinicensis Jacq. -- not accepted
  Justicia martinsoniana R.A. Howard -- accepted -- Puerto Rico water-willow
  Justicia mirabiloides Lam. -- accepted -- West Indian water-willow
  Justicia mortuifluminis Fernald -- not accepted
  Justicia nitida Jacq. -- not accepted
  Justicia ovata (Walter) Lindau -- accepted -- looseflower waterwillow, looseflower water-willow
  Justicia ovata var. angusta (Chapm.) R.W. Long -- not accepted
  Justicia ovata var. lanceolata (Chapm.) R.W. Long -- accepted -- loose justica, looseflower water-willow
  Justicia ovata var. ovata (Walter) Lindau -- accepted -- looseflower water-willow
  Justicia pectoralis Jacq. -- accepted -- freshcut
  Justicia periplocifolia auct. non Jacq. -- not accepted -- tropical waterwillow
  Justicia pilosella (Nees) Hilsenb. -- accepted -- Gregg's tube tongue
  Justicia quadrifida Vahl -- not accepted
  Justicia resupinata Vahl -- not accepted
  Justicia runyonii Small -- accepted -- Runyon's waterwillow, Runyon's water-willow
  Justicia secunda Vahl -- accepted
  Justicia sessilis Jacq. -- not accepted
  Justicia sonorae Wassh. -- accepted -- Sonoran water-willow
  Justicia sphaerosperma Vahl. -- accepted -- tropical waterwillow
  Justicia spicata Ruiz & Pav. -- not accepted
  Justicia spicigera Schltdl. -- accepted -- mohintli
  Justicia spinosa Jacq. -- not accepted
  Justicia tobagensis (Urb.) Wassh. -- accepted
  Justicia turneri Hilsenb. -- accepted -- Turner's water-willow
  Justicia umbratilis Fernald -- not accepted
  Justicia veracruzana T.F. Daniel -- accepted
  Justicia verticillaris (Nees) Urb. -- not accepted
  Justicia warnockii B.L. Turner -- accepted -- Warnock's waterwillow, Warnock's water-willow
  Justicia wrightii A. Gray -- accepted -- Wright's water-willow
  Keckiella Straw -- accepted
  Keckiella antirrhinoides (Benth.) Straw -- accepted -- snapdragon penstemon, chaparral bush-beardtongue
  Keckiella antirrhinoides ssp. antirrhinoides (Benth.) Straw -- accepted -- snapdragon penstemon
  Keckiella antirrhinoides ssp. microphylla (A. Gray) Straw -- accepted -- snapdragon penstemon, bush penstemon
  Keckiella antirrhinoides var. antirrhinoides (Benth.) Straw -- not accepted
  Keckiella antirrhinoides var. microphylla (A. Gray) N.H. Holmgren -- not accepted
  Keckiella breviflora (Lindl.) Straw -- accepted -- gaping beardtongue, bush beardtongue
  Keckiella breviflora ssp. breviflora (Lindl.) Straw -- accepted -- bush beardtongue
  Keckiella breviflora ssp. glabrisepala (D.D. Keck) Straw -- accepted -- bush beardtongue
  Keckiella breviflora var. breviflora (Lindl.) Straw -- not accepted
  Keckiella breviflora var. glabrisepala (D.D. Keck) N.H. Holmgren -- not accepted
  Keckiella cordifolia (Benth.) Straw -- accepted -- heartleaf keckiella
  Keckiella corymbosa (Benth.) Straw -- accepted -- redwood keckiella
  Keckiella lemmonii (A. Gray) Straw -- accepted -- Lemmon's keckiella, bush beardtongue
  Keckiella rothrockii (A. Gray) Straw -- accepted -- Rothrock's penstemon, Rothrock's keckiella
  Keckiella rothrockii ssp. jacintensis (Abrams) Straw -- accepted -- Rothrock's keckiella
  Keckiella rothrockii ssp. rothrockii (A. Gray) Straw -- accepted -- Rothrock's keckiella, Rothrock's penstemon
  Keckiella rothrockii var. jacintensis (Abrams) N.H. Holmgren -- not accepted
  Keckiella rothrockii var. rothrockii (A. Gray) Straw -- not accepted
  Keckiella ternata (Torr. ex A. Gray) Straw -- accepted -- scarlet keckiella
  Keckiella ternata ssp. septentrionalis (Munz & I.M. Johnst.) Straw -- accepted -- scarlet keckiella
  Keckiella ternata ssp. ternata (Torr. ex A. Gray) Straw -- accepted -- scarlet keckiella
  Keckiella ternata var. septentrionalis (Munz & I.M. Johnst.) N.H. Holmgren -- not accepted
  Keckiella ternata var. ternata (Torr. ex A. Gray) Straw -- not accepted
  Kickxia Dumort. -- accepted -- cancerwort
  Kickxia elatine (L.) Dumort. -- accepted -- sharpleaf cancerwort, cancerwort, fluvellin, roundleaf fluvellin, sharppoint fluvellin
  Kickxia spuria (L.) Dumort. -- accepted -- roundleaf cancerwort
  Kigelia DC. -- accepted -- sausage tree
  Kigelia africana (Lam.) Benth. -- accepted -- sausage tree
  Kigelia pinnata (Jacq.) DC. -- not accepted
  Koellia albescens (Torr. & A. Gray) Kuntze -- not accepted
  Koellia aristata (Michx.) Kuntze -- not accepted
  Koellia beadlei Small -- not accepted
  Koellia clinopodioides (Torr. & A. Gray) Kuntze -- not accepted
  Koellia curvipes Greene -- not accepted
  Koellia dubia (A. Gray) Small -- not accepted
  Koellia flexuosa auct. non (Walter) MacMill. -- not accepted
  Koellia hugeri Small -- not accepted
  Koellia hyssopifolia (Benth.) Britton -- not accepted
  Koellia incana (L.) Kuntze -- not accepted
  Koellia leptodon (A. Gray) Small -- not accepted
  Koellia montana (Michx.) Kuntze -- not accepted
  Koellia multiflora Small -- not accepted
  Koellia mutica (Michx.) Kuntze -- not accepted
  Koellia nuda (Nutt.) Kuntze -- not accepted
  Koellia pauciflora Small -- not accepted
  Koellia pilosa (Nutt.) Britton -- not accepted
  Koellia pycnanthemoides (Leavenw.) Kuntze -- not accepted
  Koellia verticillata (Michx.) Kuntze -- not accepted
  Koellia virginiana (L.) MacMill. -- not accepted
  Kohleria Regel -- accepted
  Kohleria eriantha (Benth.) Hanst. -- not accepted
  Kopsiopsis Beck -- accepted
  Kopsiopsis hookeri (Walp.) Govaerts -- accepted -- Vancouver groundcone
  Kopsiopsis strobilacea (A. Gray) Beck -- accepted -- California groundcone
  Lagotis Gaertn. -- accepted
  Lagotis glauca Gaertn. -- accepted -- weaselsnout
  Lagotis glauca ssp. glauca Gaertn. -- accepted -- weaselsnout
  Lagotis glauca ssp. lanceolata (Hultén) D.F. Murray & Elven -- accepted -- little weaselsnout
  Lagotis glauca ssp. minor (Willd.) Hultén -- not accepted
  Lagotis glauca var. glauca Gaertn. -- not accepted
  Lagotis glauca var. stelleri (Cham. & Schltdl.) Trautv. -- not accepted
  Lagotis minor (Willd.) Standl. -- not accepted -- little weaselsnout
  Lagotis stelleri (Cham. & Schltdl.) Raup -- not accepted
  Lallemantia Fisch. & C.A. Mey. -- accepted
  Lallemantia peltata (L.) Fisch. & C.A. Mey. -- accepted -- lion's heart
  Lamiaceae -- accepted -- mints, menthes
  Lamiales -- accepted
  Lamiastrum Heist. ex Fabr. -- not accepted
  Lamiastrum galeobdolon (L.) Ehrend. & Polatschek -- not accepted -- yellow archangel
  Lamium L. -- accepted -- deadnettle
  Lamium album L. -- accepted -- white deadnettle
  Lamium album var. maculatum L. -- not accepted
  Lamium amplexicaule L. -- accepted -- common henbit, henbit, giraffehead, henbit deadnettle
  Lamium amplexicaule var. album Pickens & M.C. Pickens -- not accepted
  Lamium confertum Fr. -- accepted -- garden henbit
  Lamium dissectum With. -- not accepted
  Lamium galeobdolon (L.) L. -- accepted -- yellow archangel
  Lamium hybridum auct. non Vill. -- not accepted -- hybrid deadnettle
  Lamium maculatum L. -- accepted -- spotted henbit
  Lamium moluccellaefolium Fr. -- not accepted
  Lamium moluccellifolium Fr. -- not accepted
  Lamium purpureum L. -- accepted -- red deadnettle, purple deadnettle
  Lamium purpureum var. incisum (Willd.) Pers. -- accepted -- hybrid deadnettle, red deadnettle, purple deadnettle
  Lamium purpureum var. purpureum L. -- accepted -- purple deadnettle
  Lantana L. -- accepted
  Lantana achyranthifolia Desf. -- accepted -- brushland shrub-verbena, brushland shrubverbena
  Lantana aculeata L. -- not accepted
  Lantana alba Mill. -- not accepted
  Lantana arida Britton -- not accepted
  Lantana bahamensis auct. non Britton -- not accepted
  Lantana bahamensis var. floridana Moldenke -- not accepted
  Lantana camara L. -- accepted -- largeleaf lantana
  Lantana camara var. aculeata (L.) Moldenke -- not accepted
  Lantana camara var. flava (Medik.) Moldenke -- not accepted
  Lantana camara var. hybrida (Neubert) Moldenke -- not accepted
  Lantana camara var. mista (L.) L.H. Bailey -- not accepted
  Lantana camara var. mutabilis (Hook.) L.H. Bailey -- not accepted
  Lantana camara var. nivea (Vent.) L.H. Bailey -- not accepted
  Lantana camara var. sanguinea (Medik.) L.H. Bailey -- not accepted
  Lantana canescens Kunth -- accepted -- hammock shrubverbena
  Lantana depressa Small -- accepted -- depressed shrubverbena
  Lantana depressa var. depressa Small -- accepted -- depressed shrubverbena
  Lantana depressa var. floridana (Moldenke) R.W. Sanders -- accepted -- Florida shrubverbena
  Lantana depressa var. sanibelensis R.W. Sanders -- accepted -- Sanibel shrubverbena
  Lantana exarata Urb. & Ekman -- accepted -- Caribbean shrubverbena
  Lantana frutilla Moldenke -- not accepted
  Lantana fucata Lindl. -- accepted
  Lantana fucata var. antillana Moldenke -- not accepted
  Lantana glandulosissima Hayek -- not accepted
  Lantana hirta auct. non Graham -- not accepted
  Lantana hispida auct. non Kunth -- not accepted
  Lantana horrida Kunth -- accepted
  Lantana horrida sensu Moldenke, non Kunth -- not accepted
  Lantana horrida var. latibracteata Moldenke -- not accepted
  Lantana insularis Moldenke -- accepted -- island lantana
  Lantana involucrata L. -- accepted -- buttonsage
  Lantana involucrata var. involucrata L. -- accepted -- buttonsage
  Lantana involucrata var. odorata (L.) Moldenke -- accepted -- fragrant buttonsage
  Lantana macropoda Torr. -- not accepted
  Lantana microcephala A. Rich. -- not accepted
  Lantana montevidensis (Spreng.) Briq. -- accepted -- trailing shrubverbena
  Lantana notha Moldenke -- not accepted
  Lantana ovatifolia auct. non Britton. -- not accepted
  Lantana ovatifolia var. reclinata R.W. Long -- not accepted
  Lantana reticulata Pers. -- accepted -- netted shrubverbena
  Lantana scorta Moldenke -- not accepted
  Lantana sellowiana Link & Otto -- not accepted
  Lantana strigocamara R.W. Sanders -- not accepted
  Lantana strigosa (Griseb.) Urb. -- accepted -- rough shrubverbena
  Lantana tiliifolia auct. non Cham. -- not accepted
  Lantana trifolia L. -- accepted -- threeleaf shrubverbena
  Lantana urticifolia Mill. -- not accepted -- nettleleaf shrubverbena
  Lantana urticifolia ssp. moldenkei R.W. Sanders -- not accepted -- nettleleaf shrubverbena
  Lantana urticifolia ssp. urticifolia Mill. -- not accepted -- nettleleaf shrubverbena
  Lantana urticoides Hayek -- not accepted -- western lantana, West Indian shrubverbena
  Lantana urticoides var. hispidula Moldenke -- not accepted
  Lantana velutina M. Martens & Galeotti -- accepted -- velvet shrubverbena
  Lavandula L. -- accepted -- lavender
  Lavandula angustifolia Mill. -- accepted -- English lavender
  Lavandula latifolia Medik. -- accepted -- broadleaved lavender
  Lavandula officinalis Chaix -- not accepted
  Lavandula spica L. -- not accepted
  Lavandula stoechas L. -- accepted -- French lavender
  Lavandula vera DC. -- not accepted
  Lavandula X intermedia Emeric ex Loisel. -- accepted -- lavandin
  Lecticula resupinata (B.D. Greene ex Bigelow) Barnhart -- not accepted
  Leiostemon ambiguus (Torr.) Greene -- not accepted
  Lendneria Minod -- not accepted
  Lendneria verticillata (Mill.) Britton -- not accepted
  Lentibulariaceae -- accepted -- bladderworts
  Leonotis (Pers.) R. Br. -- accepted -- lion's ear
  Leonotis leonurus (L.) R. Br. -- accepted -- lion's ear
  Leonotis nepetifolia (L.) R. Br. -- accepted -- Christmas candlestick
  Leonurus L. -- accepted -- motherwort
  Leonurus artemisia auct. non Lour. -- not accepted
  Leonurus cardiaca L. -- accepted -- motherwort, common motherwort
  Leonurus cardiaca ssp. cardiaca L. -- accepted -- common motherwort
  Leonurus cardiaca ssp. villosus (Desf. ex Spreng.) Hyl. -- not accepted -- common motherwort
  Leonurus cardiaca var. villosus (Desf. ex Spreng.) Benth. -- not accepted
  Leonurus japonicus Houtt. -- accepted -- honeyweed
  Leonurus marrubiastrum L. -- not accepted -- lion's tail
  Leonurus sibiricus L. -- accepted -- honeyweed
  Lepechinia Willd. -- accepted -- pitchersage
  Lepechinia calycina (Benth.) Epling -- accepted -- woodbalm
  Lepechinia cardiophylla Epling -- accepted -- heart-leaved pitcher-sage, Santa Ana pitchersage
  Lepechinia fragrans (Greene) Epling -- accepted -- island pitchersage
  Lepechinia ganderi Epling -- accepted -- San Diego pitchersage, Gander's pitcher-sage
  Lepechinia hastata (A. Gray) Epling -- accepted -- pakaha
  Lepechinia rossii S. Boyd & Mistrata -- accepted
  Lepidagathis alopecuroidea (Vahl) R. Br. ex Griseb. -- accepted -- pata de gallina
  Lepidagathis alopecuroides (Vahl) R. Br. ex Griseb. -- not accepted
  Leptamnium virginianum (L.) Raf. -- not accepted
  Leptandra virginica (L.) Nutt. -- not accepted
  Leucas R. Br. -- accepted
  Leucas martinicensis (Jacq.) W.T. Aiton -- accepted -- whitewort
  Leucophyllum Humb. & Bonpl. -- accepted -- barometerbush
  Leucophyllum candidum I.M. Johnst. -- accepted -- Brewster County barometerbush
  Leucophyllum frutescens (Berland.) I.M. Johnst. -- accepted -- Texas barometer bush, cenizo
  Leucophyllum minus A. Gray -- accepted -- big bend cenizo, Big Bend barometerbush
  Leucophyllum violaceum Pennell -- not accepted
  Leucophyllum zygophyllum I.M. Johnst. -- accepted -- cimmeron
  Leucospora Nutt. -- accepted
  Leucospora multifida (Michx.) Nutt. -- accepted -- narrowleaf paleseed
  Ligustrum L. -- accepted -- privet
  Ligustrum acuminatum Koehne -- not accepted
  Ligustrum amurense Carrière -- accepted -- Amur privet
  Ligustrum ibota Siebold -- accepted
  Ligustrum japonica Thunb. -- not accepted -- Japanese privet
  Ligustrum japonicum Thunb. -- accepted -- Japanese privet
  Ligustrum lucidum W.T. Aiton -- accepted -- tree privet, glossy privet
  Ligustrum microcarpum Kaneh. & Sasaki -- not accepted
  Ligustrum obtusifolium Siebold & Zucc. -- accepted -- border privet
  Ligustrum ovalifolium Hassk. -- accepted -- California privet
  Ligustrum quihoui Carrière -- accepted -- waxyleaf privet
  Ligustrum robustum (Roxb.) Blume -- accepted -- wild privet
  Ligustrum sempervirens (Franch.) Lingelsh. -- accepted -- privet
  Ligustrum sinense Lour. -- accepted -- common Chinese privet, Chinese privet
  Ligustrum tschonoskii Decne. -- accepted -- Tschonosky privet
  Ligustrum villosum May -- not accepted
  Ligustrum vulgare L. -- accepted -- wild privet, European privet
  Limnophila R. Br. -- accepted -- marshweed
  Limnophila aromatica (Lam.) Merr. -- accepted -- limnophila
  Limnophila fragrans Seem. -- accepted -- limnophila
  Limnophila indica (L.) Druce -- accepted -- Indian marshweed
  Limnophila sessiliflora (Vahl) Blume -- accepted -- ambulia, Asian marshweed
  Limnophila X ludoviciana Thieret -- accepted -- marshweed
  Limosella L. -- accepted -- mudwort
  Limosella acaulis Sessé & Moc. -- accepted -- Owyhee mudwort
  Limosella aquatica L. -- accepted -- water mudwort, awlleaf mudwort, awl-leaf mudwort, northern mudwort
  Limosella aquatica var. tenuifolia Hoffm. -- not accepted
  Limosella australis R. Br. -- accepted -- Welsh mudwort
  Limosella pubiflora Pennell -- accepted -- Chiricahua Mountain mudwort, Chiricahua mudwort
  Limosella subulata E. Ives -- not accepted
  Linaria Mill. -- accepted -- toadflax
  Linaria aeruginea (Gouan) Cav. -- accepted -- roadside toadflax
  Linaria angustissima Borbás -- accepted -- Italian toadflax
  Linaria bipartita (Vent.) Willd. -- accepted -- clovenlip toadflax
  Linaria canadensis (L.) Dum. Cours. -- not accepted -- Canada toadflax
  Linaria canadensis var. texana (Scheele) Pennell -- not accepted
  Linaria cymbalaria (L.) Mill. -- not accepted
  Linaria dalmatica (L.) Mill. -- accepted -- Dalmatian toadflax, Dalmation toadflax
  Linaria dalmatica ssp. dalmatica (L.) Mill. -- accepted -- Dalmatian toadflax, Dalmation toadflax
  Linaria dalmatica ssp. macedonica (Griseb.) D.A. Sutton -- accepted -- Dalmatian toadflax, Dalmation toadflax
  Linaria dalmatica var. macedonica (Griseb.) Vandas -- not accepted
  Linaria elatine (L.) Mill. -- not accepted
  Linaria floridana Chapm. -- not accepted
  Linaria genistifolia (L.) Mill. -- accepted -- broomleaf toadflax
  Linaria genistifolia ssp. dalmatica (L.) Maire & Petitm. -- not accepted -- Dalmatian toadflax
  Linaria genistifolia ssp. genistifolia (L.) Mill. -- accepted -- broomleaf toadflax
  Linaria genistifolia var. genistifolia (L.) Mill. -- not accepted
  Linaria granidflora Desf. -- accepted
  Linaria incarnata (Vent.) Spreng. -- accepted -- crimson toadflax
  Linaria italica Trevir. -- not accepted
  Linaria jattae Palanza -- not accepted
  Linaria linaria (L.) H. Karst. -- not accepted
  Linaria macedonica Griseb. -- not accepted
  Linaria maroccana Hook. f. -- accepted -- Moroccan toadflax
  Linaria pinifolia (Poir.) Thell. -- accepted -- pineneedle toadflax
  Linaria purpurea (L.) Mill. -- accepted -- purple toadflax
  Linaria repens (L.) Mill. -- accepted -- striped toadflax
  Linaria reticulata (Sm.) Desf. -- accepted -- purplenet toadflax
  Linaria spartea (L.) Chaz. -- accepted -- ballast toadflax
  Linaria supina (L.) Chaz. -- accepted -- lesser butter and eggs
  Linaria supina ssp. supina (L.) Chaz. -- accepted -- lesser butter and eggs
  Linaria texana Scheele -- not accepted
  Linaria vulgaris Mill. -- accepted -- butter and eggs, greater butter-and-eggs, yellow toadflax, flaxweed, Jacob's ladder, ramsted, wild snapdragon
  Linaria X hybrida Schur -- accepted
  Linaria X sepium J.G. Allm. -- accepted -- toadflax
  Lindernia All. -- accepted -- false pimpernel
  Lindernia anagallidea (Michx.) Pennell -- not accepted
  Lindernia antipoda (L.) Alston -- accepted -- sparrow false pimpernel
  Lindernia brucei Howard -- accepted
  Lindernia ciliata (Colsmann) Pennell -- accepted -- fringed false pimpernel
  Lindernia crustacea (L.) F. Muell. -- accepted -- Malaysian false pimpernel
  Lindernia crustacea var. smithii O. Deg., I. Deg. & G.C. Ruhle -- not accepted
  Lindernia diffusa (L.) Wettst. -- accepted -- spreading false pimpernel
  Lindernia dubia (L.) Pennell -- accepted -- moistbank pimpernel, yellow-seed false pimpernel, shortstalk lindernia, yellowseed false pimpernel
  Lindernia dubia var. anagallidea (Michx.) Cooperr. -- not accepted -- yellow-seed false pimpernel, false pimpernel, yellowseed false pimpernel
  Lindernia dubia var. dubia (L.) Pennell -- not accepted -- yellowseed false pimpernel, yellow-seed false pimpernel
  Lindernia dubia var. inundata (Pennell) Pennell -- not accepted -- false pimpernel, lindernie litigieuse variété estuarienne, yellowseed false pimpernel
  Lindernia dubia var. major (Pursh) Pennell -- not accepted
  Lindernia dubia var. riparia (Raf.) Fernald -- not accepted
  Lindernia dubia var. typica Pennell -- not accepted
  Lindernia grandiflora Nutt. -- accepted -- savannah false pimpernel
  Lindernia monticola Nutt. -- accepted -- piedmont false pimpernel
  Lindernia procumbens (Krock.) Philcox -- accepted -- prostrate false pimpernel
  Lindernia procumbens auct. non (Knock.) Borb. -- not accepted
  Lindernia pyxidaria auct. non L. -- not accepted
  Lindernia saxicola M.A. Curtis -- not accepted
  Lindernia verticillata (Mill.) Britton -- not accepted
  Linderniaceae -- accepted
  Linociera Sw. ex Schreb. -- not accepted
  Linociera axilliflora Griseb. -- not accepted
  Linociera caribaea (Jacq.) Knobl. -- not accepted
  Linociera domingensis (Lam.) Knobl. -- not accepted
  Linociera holdridgei Camp & Monach. -- not accepted
  Linociera holdridgii Camp & Monach. -- not accepted
  Linociera ligustrina Sw. -- not accepted
  Linociera lingustrina (Sw.) Sw. -- not accepted
  Lippia L. -- accepted
  Lippia alba (Mill.) N.E. Br. ex Britton & P. Wilson -- accepted -- white lippia, bushy lippia
  Lippia canescens Kunth -- not accepted
  Lippia citriodora Kunth -- not accepted
  Lippia citrodora Kunth -- not accepted
  Lippia cuneifolia (Torr.) Steud. -- not accepted
  Lippia dulcis Trevir. -- not accepted
  Lippia geminata Kunth -- not accepted
  Lippia graveolens Kunth -- accepted -- scented lippia, scented matgrass, Mexican oregano
  Lippia helleri Britton -- not accepted
  Lippia incisa (Small) Tidestr. -- not accepted
  Lippia lanceolata Michx. -- not accepted
  Lippia lanceolata var. recognita Fernald & Griscom -- not accepted
  Lippia ligustrina (Lag.) Britton -- not accepted
  Lippia lycioides (Cham.) Steud. -- not accepted
  Lippia micromera Schauer -- accepted -- Spanish thyme
  Lippia micromera var. helleri (Britton) Moldenke -- accepted -- Spanish thyme
  Lippia montevidensis Spreng. -- not accepted
  Lippia nodiflora (L.) Michx. -- not accepted
  Lippia nodiflora var. canescens (Kunth) Kuntze -- not accepted
  Lippia nodiflora var. reptans (Kunth) Kuntze -- not accepted
  Lippia nodiflora var. rosea (D. Don) Munz -- not accepted
  Lippia reptans Kunth -- not accepted
  Lippia stoechadifolia (L.) Kunth -- not accepted -- southern frogfruit, southern fogfruit
  Lippia strigulosa M. Martens & Galeotti -- not accepted
  Lippia triphylla (L'Hér.) Kuntze -- not accepted
  Lippia wrightii A. Gray -- not accepted
  Littorella P.J. Bergius -- accepted
  Littorella americana Fernald -- not accepted
  Littorella uniflora Asch. -- accepted -- American shoreweed
  Littorella uniflora var. americana (Fernald) Gleason -- not accepted
  Lophospermum D. Don -- accepted
  Lophospermum erubescens D. Don -- accepted -- Mexican twist
  Lycopus L. -- accepted -- water horehound, waterhorehound
  Lycopus americanus Muhl. ex W.P.C. Bartram -- accepted -- waterhorehound, cut-leaf water-horehound, American bugleweed, water horehound, American waterhorehound, American water horehound
  Lycopus americanus var. laurentianus (Roll.-Germ.) B. Boivin -- not accepted -- lycope d'Amérique variété du Saint-Laurent
  Lycopus americanus var. longii Benner -- not accepted
  Lycopus americanus var. scabrifolius Fernald -- not accepted
  Lycopus amplectens Raf. -- accepted -- clasping water horehound
  Lycopus amplectens var. pubens (Britton) Fernald -- not accepted
  Lycopus angustifolius Elliott -- accepted
  Lycopus asper Greene -- accepted -- rough water-horehound, rough bugleweed
  Lycopus cokeri H.E. Ahles ex Sorrie -- accepted -- Carolina water horehound
  Lycopus diantherus Buch.-Ham. ex Roxb. -- not accepted
  Lycopus europaeus L. -- accepted -- gypsywort
  Lycopus europaeus ssp. mollis (Kern.) Rothm. ex Skalický -- not accepted
  Lycopus europaeus var. mollis (Kern.) Briq. -- not accepted
  Lycopus laurentianus Roll.-Germ. -- accepted -- St. Lawrence waterhorehound
  Lycopus lucidus auct. non Turcz. ex Benth. -- not accepted
  Lycopus lucidus ssp. americanus (A. Gray) Hultén -- not accepted
  Lycopus lucidus var. americanus A. Gray -- not accepted
  Lycopus pubens Britton -- not accepted
  Lycopus rubellus Moench -- accepted -- taperleaf bugleweed, taperleaf water horehound
  Lycopus rubellus var. angustifolius (Elliott) H.E. Ahles -- not accepted
  Lycopus rubellus var. arkansanus (Fresen.) Benner -- not accepted
  Lycopus rubellus var. lanceolatus Benner -- not accepted
  Lycopus sessilifolius A. Gray -- not accepted
  Lycopus sinuatus Elliott -- not accepted
  Lycopus uniflorus Michx. -- accepted -- oneflower bugleweed, bugleweed, northern water-horehound, northern bugleweed
  Lycopus uniflorus var. ovatus Fernald & H. St. John -- accepted -- northern bugleweed
  Lycopus uniflorus var. uniflorus Michx. -- accepted -- northern bugleweed
  Lycopus velutinus Rydb. -- not accepted
  Lycopus virginicus L. -- accepted -- lycope de Virginie, Virginia bugleweed, Virginia water horehound
  Lycopus virginicus var. pauciflorus Benth. -- not accepted
  Lycopus X sherardii Steele (pro. sp.) -- accepted -- Sherard's waterhorehound
  Lysimachia monnieri L. -- not accepted
  Mabrya Elisens -- accepted
  Mabrya acerifolia (Pennell) Elisens -- accepted -- brittlestem
  Macbridea Elliott -- accepted
  Macbridea alba Chapm. -- accepted -- white birds-in-a-nest
  Macbridea caroliniana (Walter) S.F. Blake -- accepted -- Carolina birds-in-a-nest
  Macbridea pulchra Elliott -- not accepted
  Macfadyena A. DC. -- accepted
  Macfadyena uncata (Andrews) Sprague & Sandwith -- accepted
  Macfadyena unguis-cati (L.) A.H. Gentry -- not accepted -- claw vine, catclaw vine
  Macranthera Nutt. ex Benth. -- accepted
  Macranthera flammea (W. Bartram) Pennell -- accepted -- flameflower
  Macuillamia obovata Raf. -- not accepted
  Macuillamia repens (Sw.) Pennell -- not accepted
  Macuillamia rotundifolia (Michx.) Raf. -- not accepted
  Majorana hortensis Moench -- not accepted
  Majorana majorana (L.) H. Karst. -- not accepted
  Majorana onites (L.) Benth. -- not accepted
  Mansoa DC. -- accepted -- garlicvine
  Mansoa alliacea (Lam.) A.H. Gentry -- accepted -- garlicvine
  Mansoa hymenacea (DC.) A.H. Gentry -- not accepted -- membranous garlicvine
  Mappia origanoides (L.) House -- not accepted
  Markhamia Seem. ex Baill. -- accepted
  Markhamia hildebrantii (Baker) Sprague -- not accepted
  Markhamia lutea (Benth.) K. Schum. -- accepted -- siala
  Marrubium L. -- accepted -- horehound
  Marrubium candidissimum L. -- not accepted
  Marrubium incanum Desr. -- accepted -- horehound
  Marrubium peregrinum L. -- accepted -- horehound
  Marrubium vulgare L. -- accepted -- white horehound, horehound
  Marsypianthes Mart. ex Benth. -- accepted
  Marsypianthes chamaedrys (Vahl) Kuntze -- accepted -- ortela
  Martinella Baill. -- accepted
  Martinella obovata (Kunth) Bureau & K. Schum. -- accepted
  Martynia L. -- accepted
  Martynia althaeifolia Benth. -- not accepted
  Martynia annua L. -- accepted -- una de gato
  Martynia arenaria Engelm. -- not accepted
  Martynia fragrans Lindl. -- not accepted
  Martynia louisiana Mill. -- not accepted
  Martynia louisianica Mill. -- not accepted
  Martynia lutea Lindl. -- not accepted
  Martynia parviflora Wooton -- not accepted
  Martynia proboscidea Gloxin -- not accepted
  Martyniaceae -- accepted
  Maurandella (A. Gray) Rothm. -- accepted
  Maurandella antirrhiniflora (Humb. & Bonpl. ex Willd.) Rothm. -- accepted -- roving sailor, climbing snapdragon
  Maurandella petrophila (Coville & C.V. Morton) Rothm. -- not accepted
  Maurandya Ortega -- accepted
  Maurandya acerifolia Pennell -- not accepted
  Maurandya antirrhiniflora Humb. & Bonpl. ex Willd. -- not accepted
  Maurandya barclaiana Lindl. -- accepted -- Mexican viper
  Maurandya petrophila Coville & C.V. Morton -- not accepted
  Maurandya wislizeni Engelm. ex A. Gray -- not accepted
  Maurandya wislizenii Engelm. ex A. Gray -- not accepted
  Mayepea axilliflora (Griseb.) Krug & Urb. -- not accepted
  Mayepea caribaea (Jacq.) Kuntze -- not accepted
  Mayepea domingensis (Lam.) Krug & Urb. -- not accepted
  Mazus Lour. -- accepted
  Mazus japonicus (Thunb.) Kuntze -- not accepted
  Mazus miquelii Makino -- accepted -- Miquel's mazus
  Mazus pumilus (Burm. f.) Steenis -- accepted -- Japanese mazus
  Mazus reptans N.E. Br. -- not accepted
  Mecardonia Ruiz & Pav. -- accepted
  Mecardonia acuminata (Walter) Small -- accepted -- axilflower
  Mecardonia acuminata var. acuminata (Walter) Small -- accepted -- axilflower
  Mecardonia acuminata var. microphylla (Raf.) Pennell -- accepted -- axilflower
  Mecardonia acuminata var. peninsularis Pennell -- accepted -- axilflower
  Mecardonia dianthera (Sw.) Pennell -- not accepted
  Mecardonia peduncularis (Benth.) Small -- not accepted
  Mecardonia procumbens (Mill.) Small -- accepted -- baby jump-up, baby jumpup
  Mecardonia tenuis Small -- not accepted
  Mecardonia vandellioides auct. non (Kunth) Pennell -- not accepted
  Meehania Britton -- accepted
  Meehania cordata (Nutt.) Britton -- accepted -- Meehan's mint
  Megaskepasma Lindau -- accepted -- Brazilian red-cloak
  Megaskepasma erythrochlamys Lindau -- accepted -- Brazilian red-cloak
  Melampyrum L. -- accepted -- cowwheat
  Melampyrum latifolium (W.P.C. Barton) Muhl. ex Britton & A. Br. -- not accepted
  Melampyrum lineare Desr. -- accepted -- narrowleaf cowwheat
  Melampyrum lineare var. americanum (Michx.) Beauverd -- not accepted
  Melampyrum lineare var. latifolium W.P.C. Barton -- accepted -- narrowleaf cowwheat
  Melampyrum lineare var. lineare Desr. -- accepted -- narrowleaf cowwheat
  Melampyrum lineare var. pectinatum (Pennell) Fernald -- accepted -- narrowleaf cowwheat
  Melasma melampyroides (Rich.) Pennell -- not accepted
  Melissa L. -- accepted -- balm
  Melissa officinalis L. -- accepted -- common balm
  Melissa pulegioides (L.) L. -- not accepted
  Menodora Bonpl. -- accepted -- twinberry
  Menodora decemfida (Gillies ex Hook. & Arn.) A. Gray -- accepted -- tenfinger menodora
  Menodora decemfida var. longifolia Steyerm. -- not accepted -- tenfinger menodora
  Menodora heterophylla Moric. ex DC. -- accepted -- low menodora
  Menodora longiflora A. Gray -- accepted -- showy menodora
  Menodora scabra A. Gray -- accepted -- rough menodora
  Menodora scabra var. glabrescens A. Gray -- not accepted
  Menodora scabra var. laevis (Wooton & Standl.) Steyerm. -- not accepted
  Menodora scabra var. longituba Steyerm. -- not accepted
  Menodora scabra var. ramosissima Steyerm. -- not accepted
  Menodora scabra var. scabra A. Gray -- not accepted -- rough menodora
  Menodora scoparia Engelm. ex A. Gray -- not accepted
  Menodora spinescens A. Gray -- accepted -- spiny menodora
  Menodora spinescens var. mohavensis Steyerm. -- not accepted
  Mentha L. -- accepted -- mint
  Mentha alopecuroides Hull -- not accepted
  Mentha aquatica L. -- accepted -- water mint
  Mentha aquatica var. crispa (L.) Benth. -- not accepted
  Mentha arvensis L. -- accepted -- field mint, wild mint
  Mentha arvensis ssp. borealis (Michx.) Roy L. Taylor & MacBryde -- not accepted
  Mentha arvensis ssp. haplocalyx Briq. -- not accepted
  Mentha arvensis var. canadensis (L.) Kuntze -- not accepted
  Mentha arvensis var. glabrata (Benth.) Fernald -- not accepted
  Mentha arvensis var. lanata Piper -- not accepted
  Mentha arvensis var. sativa auct. non Benth. -- not accepted
  Mentha arvensis var. villosa (Benth.) S.R. Stewart -- not accepted
  Mentha canadensis L. -- not accepted -- Canadian mint
  Mentha cardiaca J. Gerard ex Baker -- not accepted
  Mentha citrata Ehrh. -- not accepted
  Mentha cordifolia Lej. & Courtois auct. -- not accepted
  Mentha crispa L. -- not accepted
  Mentha dumetorum Schult. -- not accepted
  Mentha gentilis auct. non L. -- not accepted
  Mentha gentilis L. -- not accepted
  Mentha glabrior (Hook.) Rydb. -- not accepted
  Mentha longifolia auct. non (L.) Huds. -- not accepted
  Mentha longifolia var. mollissima (Borkh.) Rouy -- not accepted
  Mentha longifolia var. undulata (Willd.) Fiori -- not accepted
  Mentha nemorosa Willd. -- not accepted
  Mentha penardii (Briq.) Rydb. -- not accepted
  Mentha piperita ssp. citrata (Ehrh.) Briq. -- not accepted
  Mentha pulegium L. -- accepted -- peppermint, pennyroyal
  Mentha requienii Benth. -- accepted -- mint
  Mentha rotundifolia auct. non (L.) Huds. -- not accepted
  Mentha sativa L. -- not accepted
  Mentha spicata L. -- accepted -- bush mint, spearmint
  Mentha spicata var. longifolia L. -- not accepted
  Mentha spicata var. spicata L. -- not accepted -- spearmint
  Mentha suaveolens Ehrh. -- accepted -- bigleaf mint, mint, apple mint
  Mentha sylvestris L. -- not accepted
  Mentha viridis L. -- not accepted
  Mentha X gentilis L. -- not accepted -- red mint
  Mentha X gentilis var. cardiaca (J. Gerard ex Baker) B. Boivin (pro nm.) -- not accepted
  Mentha X gracilis Sole (pro. sp.) -- accepted -- gingermint
  Mentha X muelleriana auct. non F.W. Schultz -- not accepted
  Mentha X piperi var. citrata (Ehrh.) B. Boivin (pro nm.) -- not accepted
  Mentha X piperita L. (pro. sp.) -- accepted -- peppermint
  Mentha X piperita var. citrata (Ehrh.) Briq. -- not accepted -- lemon mint
  Mentha X piperita var. piperita L. -- not accepted -- peppermint
  Mentha X rotundifolia (L.) Huds. (pro. sp.) -- accepted -- bigleaf mint, mint
  Mentha X smithiana Graham -- accepted -- Smith's mint
  Mentha X verticillata L. -- accepted -- mint
  Mentha X verticillata var. peduncularis (Boreau) Rouy (pro nm.) -- not accepted
  Mentha X villosa Huds. (pro. sp.) -- accepted -- hairy mint
  Mentha X villosa var. alopecuroides (Hull) Briq. (pro nm.) -- not accepted
  Meyenia erecta Benth. -- not accepted
  Micheliella Briq. -- not accepted
  Micheliella anisata (Sims) Briq. -- not accepted
  Micheliella verticillata (Baldw.) Briq. -- not accepted
  Micranthemum Michx. -- accepted -- mudflower
  Micranthemum glomeratum (Chapm.) Shinners -- accepted -- manatee mudflower
  Micranthemum micranthemoides (Nutt.) Wettst. -- accepted -- Nuttall's mudflower, Nuttall's micranthemum
  Micranthemum umbrosum (J.F. Gmel.) S.F. Blake -- accepted -- shade mudflower
  Micromeria Benth. -- accepted
  Micromeria brownei (Sw.) Benth. -- not accepted -- Browne's savory
  Micromeria brownei var. pilosiuscula A. Gray -- not accepted -- Browne's savory
  Micromeria chamissonis (Benth.) Greene -- not accepted
  Micromeria pilosiuscula (A. Gray) Small -- not accepted
  Mimetanthe Greene -- not accepted
  Mimetanthe pilosa (Benth.) Greene -- not accepted -- false monkeyflower, false monkey-flower
  Mimulus L. -- accepted -- monkey-flower, monkeyflower
  Mimulus acutidens Greene -- accepted -- Kings River monkeyflower
  Mimulus alatus Aiton -- accepted -- sharpwing monkeyflower
  Mimulus alpinus (A. Gray) Piper -- not accepted
  Mimulus alsinoides Douglas ex Benth. -- accepted -- wingstem monkeyflower
  Mimulus ampliatus A.L. Grant -- not accepted
  Mimulus androsaceus Curran ex Greene -- accepted -- rockjasmine monkeyflower
  Mimulus angustatus (A. Gray) A. Gray -- accepted -- purplelip pansy monkeyflower
  Mimulus angustifolius (Greene) A.L. Grant -- accepted -- Mount Rose monkeyflower, Mt. Rose monkeyflower
  Mimulus arenarius A.L. Grant -- accepted -- sandloving monkeyflower
  Mimulus aridus (Abrams) A.L. Grant -- not accepted
  Mimulus arvensis Greene -- not accepted
  Mimulus atropurpureus Kellogg -- not accepted
  Mimulus aurantiacus Curtis -- not accepted
  Mimulus aurantiacus ssp. australis (McMinn) Munz -- not accepted
  Mimulus aurantiacus ssp. lompocensis (McMinn) Munz -- not accepted
  Mimulus aurantiacus var. aurantiacus Curtis -- not accepted
  Mimulus austiniae (Greene) A.L. Grant -- not accepted
  Mimulus bakeri Gand. -- not accepted
  Mimulus barbatus Greene -- accepted -- bearded monkeyflower
  Mimulus bicolor Hartw. ex Benth. -- accepted -- yellow and white monkeyflower
  Mimulus bifidus Pennell -- not accepted
  Mimulus bifidus ssp. fasciculatus Pennell -- not accepted
  Mimulus bigelovii (A. Gray) A. Gray -- accepted -- yellow-throat monkey-flower, Bigelow's monkeyflower
  Mimulus bigelovii var. bigelovii (A. Gray) A. Gray -- accepted -- Bigelow's monkeyflower
  Mimulus bigelovii var. cuspidatus A.L. Grant -- not accepted
  Mimulus bigelovii var. ovatus A. Gray -- not accepted
  Mimulus bigelovii var. panamintensis Munz -- accepted -- Panamint monkeyflower
  Mimulus biolettii Eastw. -- accepted -- Hetch Hetchy monkeyflower
  Mimulus bolanderi A. Gray -- accepted -- Bolander's monkeyflower
  Mimulus bolanderi var. brachydontus A.L. Grant -- not accepted
  Mimulus brachiatus Pennell -- accepted -- serpentine monkeyflower
  Mimulus brachystylis Edwin -- not accepted
  Mimulus brandegeei Pennell -- accepted -- Santa Cruz Island monkeyflower
  Mimulus breviflorus Piper -- accepted -- shortflower monkeyflower
  Mimulus brevipes Benth. -- accepted -- widethroat yellow monkeyflower
  Mimulus brevipes A. Gray -- not accepted -- widethroat yellow monkeyflower
  Mimulus breweri (Greene) Coville -- accepted -- Brewer's monkeyflower
  Mimulus caespitosus (Greene) Greene -- not accepted
  Mimulus caespitosus var. implexus (Greene) M. Peck -- not accepted
  Mimulus cardinalis Douglas ex Benth. -- accepted -- scarlet monkeyflower, scarlet monkey-flower, crimson monkeyflower
  Mimulus cardinalis auct. non Eastw. -- not accepted -- crimson monkeyflower
  Mimulus cardinalis var. exsul Greene -- not accepted
  Mimulus cardinalis var. griseus Greene -- not accepted
  Mimulus cardinalis var. rigens Greene -- not accepted
  Mimulus cardinalis var. verbenaceus (Greene) Kearney & Peebles -- not accepted
  Mimulus clarkii Kellogg ex Curran -- not accepted
  Mimulus cleistogamus J.T. Howell -- accepted -- selfing monkeyflower
  Mimulus clementinus Greene -- not accepted
  Mimulus clevelandii Brandegee -- not accepted
  Mimulus clivicola Greenm. -- accepted -- North Idaho monkeyflower, Bank monkey-flower
  Mimulus coccineus Congdon -- accepted -- Sierra monkeyflower, red monkeyflower
  Mimulus congdonii B.L. Rob. -- accepted -- Congdon's monkeyflower
  Mimulus constrictus (A.L. Grant) Pennell -- not accepted
  Mimulus corallinus Greene -- not accepted
  Mimulus cordatus Greene -- not accepted
  Mimulus cupreus hort. ex Dombrain -- accepted
  Mimulus cupriphilus M. Macnair -- accepted -- McNulty Mine monkeyflower
  Mimulus cusickii (Greene) Rattan -- accepted -- Cusick's monkeyflower
  Mimulus cuspidata Greene -- not accepted
  Mimulus decorus (A.L. Grant) Suksd. -- not accepted
  Mimulus decurtatus A.L. Grant -- not accepted
  Mimulus deflexus S. Watson -- not accepted
  Mimulus deltoideus Gand. -- not accepted
  Mimulus densus A.L. Grant -- accepted -- yellowandpurple monkeyflower, yellow and purple monkeyflower
  Mimulus dentatus Nutt. ex Benth. -- accepted -- coastal monkeyflower
  Mimulus dentatus var. gracilis A. Gray -- not accepted
  Mimulus dentilobus B.L. Rob. & Fernald -- accepted -- sharpwing monkeyflower, tooth-petal monkey-flower, toothpetal monkeyflower
  Mimulus diffusus A.L. Grant -- accepted -- Palomar monkeyflower
  Mimulus discolor A.L. Grant -- not accepted
  Mimulus douglasii (Benth.) A. Gray -- accepted -- brownies
  Mimulus dudleyi A.L. Grant -- accepted -- Dudley's monkeyflower
  Mimulus eastwoodiae Rydb. -- accepted -- Eastwood's monkey-flower, crimson monkeyflower, Eastwood's monkeyflower
  Mimulus eisenii Kellogg -- not accepted
  Mimulus equinus Greene -- not accepted
  Mimulus evanescens Meinke -- accepted -- disappearing monkeyflower
  Mimulus exiguus A. Gray -- accepted -- San Bernardino Mountain monkey-flower
  Mimulus filicaulis S. Watson -- accepted -- slenderstem monkeyflower, Hetch Hetchy monkey-flower
  Mimulus flemingii Munz -- not accepted
  Mimulus floribundus Lindl. -- accepted -- floriferous monkeyflower, purplestem monkeyflower, manyflowered monkeyflower
  Mimulus floribundus ssp. moorei Iltis -- not accepted
  Mimulus floribundus var. floribundus Lindl. -- not accepted
  Mimulus floribundus var. geniculatus (Greene) A.L. Grant -- not accepted
  Mimulus floribundus var. membranaceus (A. Nelson) A.L. Grant -- not accepted
  Mimulus floribundus var. subulatus A.L. Grant -- not accepted
  Mimulus fremontii (Benth.) A. Gray -- accepted -- Fremont's monkeyflower
  Mimulus fremontii var. viscidus (Congdon) Jeps. -- not accepted
  Mimulus gemmiparus W.A. Weber -- accepted -- Rocky Mountain monkeyflower, Weber monkey-flower
  Mimulus geniculatus Greene -- not accepted
  Mimulus geyeri Torr. -- not accepted
  Mimulus glabratus Kunth -- accepted -- roundleaf monkey-flower, mimule glabre, round-leaf monkey-flower, smooth monkeyflower, roundleaf monkeyflower
  Mimulus glabratus ssp. fremontii (Benth.) Pennell -- not accepted
  Mimulus glabratus ssp. michiganensis Pennell -- not accepted -- Michigan monkey flower
  Mimulus glabratus ssp. typicus Pennell -- not accepted
  Mimulus glabratus ssp. utahensis Pennell -- not accepted
  Mimulus glabratus var. ascendens A. Gray -- not accepted
  Mimulus glabratus var. fremontii (Benth.) A.L. Grant -- not accepted
  Mimulus glabratus var. glabratus Kunth -- accepted -- round-leaf monkey-flower, roundleaf monkeyflower
  Mimulus glabratus var. jamesii (Torr. & A. Gray ex Benth.) A. Gray -- accepted -- James' monkeyflower
  Mimulus glabratus var. michiganensis (Pennell) Fassett -- not accepted -- Michigan monkey-flower, Michigan monkeyflower
  Mimulus glabratus var. oklahomensis Fassett -- accepted -- Oklahoma monkeyflower
  Mimulus glareosus Greene -- not accepted
  Mimulus glaucescens Greene -- accepted -- shieldbract monkeyflower
  Mimulus glutinosus J.C. Wendl. -- not accepted
  Mimulus glutinosus var. brachypus A. Gray -- not accepted
  Mimulus glutinosus var. linearis (Benth.) A. Gray -- not accepted
  Mimulus glutinosus var. puniceus (Nutt.) A. Gray -- not accepted
  Mimulus gracilipes B.L. Rob. -- accepted -- slenderstalk monkeyflower
  Mimulus grandiflorus Howell -- not accepted
  Mimulus grandis (Greene) A. Heller -- not accepted
  Mimulus grantianus Eastw. -- not accepted
  Mimulus gratioloides Rydb. -- not accepted
  Mimulus grayi A.L. Grant -- accepted -- Mariposa monkeyflower
  Mimulus guttatus DC. -- accepted -- common monkeyflower, seep monkeyflower
  Mimulus guttatus ssp. arenicola Pennell -- not accepted
  Mimulus guttatus ssp. arvensis (Greene) Munz -- not accepted
  Mimulus guttatus ssp. haidensis Calder & Roy L. Taylor -- not accepted
  Mimulus guttatus ssp. litoralis Pennell -- not accepted
  Mimulus guttatus ssp. micranthus (A. Heller) Munz -- not accepted
  Mimulus guttatus ssp. scouleri (Hook.) Pennell -- not accepted
  Mimulus guttatus var. arvensis (Greene) A.L. Grant -- not accepted
  Mimulus guttatus var. decorus A.L. Grant -- not accepted
  Mimulus guttatus var. depauperatus (A. Gray) A.L. Grant -- not accepted
  Mimulus guttatus var. glaucescens (Greene) Jeps. -- not accepted
  Mimulus guttatus var. gracilis (A. Gray) G.R. Campb. -- not accepted
  Mimulus guttatus var. grandis Greene -- not accepted
  Mimulus guttatus var. guttatus DC. -- not accepted
  Mimulus guttatus var. hallii (Greene) A.L. Grant -- not accepted
  Mimulus guttatus var. insignis Greene -- not accepted
  Mimulus guttatus var. laxus (Pennell) M. Peck -- not accepted
  Mimulus guttatus var. lyratus (Benth.) Pennell -- not accepted
  Mimulus guttatus var. microphyllus (Benth.) Pennell -- not accepted
  Mimulus guttatus var. nasutus (Greene) Jeps. -- not accepted
  Mimulus guttatus var. puberulus (Greene) A.L. Grant -- not accepted
  Mimulus hallii Greene -- not accepted
  Mimulus hirsutus Howell -- not accepted
  Mimulus hymenophyllus Meinke -- accepted -- thinsepal monkeyflower
  Mimulus implexus Greene -- not accepted
  Mimulus implicatus Greene -- not accepted
  Mimulus inamoenus Greene -- not accepted
  Mimulus inconspicuus A. Gray -- accepted -- smallflower monkeyflower
  Mimulus inconspicuus var. acutidens (Greene) A. Gray -- not accepted
  Mimulus inconspicuus var. latidens A. Gray -- not accepted
  Mimulus inflatulus Suksd. -- not accepted
  Mimulus inodorus Greene -- not accepted
  Mimulus jamesii Torr. & A. Gray ex Benth. -- not accepted
  Mimulus jamesii var. fremontii Benth. -- not accepted
  Mimulus jamesii var. texensis A. Gray -- not accepted
  Mimulus jepsonii A.L. Grant -- accepted -- Jepson's monkeyflower
  Mimulus johnstonii A.L. Grant -- accepted -- Johnston's monkeyflower
  Mimulus jungermannioides Suksd. -- accepted -- liverwort monkeyflower
  Mimulus kelloggii (Curran ex Greene) Curran ex A. Gray -- accepted -- Kellogg's monkeyflower
  Mimulus laciniatus A. Gray -- accepted -- cutleaf monkeyflower
  Mimulus langsdorffii Donn ex Greene -- not accepted
  Mimulus langsdorffii var. argutus Greene -- not accepted
  Mimulus langsdorffii var. arvensis (Greene) Jeps. -- not accepted
  Mimulus langsdorffii var. californicus Jeps. -- not accepted
  Mimulus langsdorffii var. grandis (Greene) Greene -- not accepted
  Mimulus langsdorffii var. guttatus (DC.) Jeps. -- not accepted
  Mimulus langsdorffii var. insignis (Greene) Greene -- not accepted
  Mimulus langsdorffii var. microphyllus (Benth.) A. Nelson & J.F. Macbr. -- not accepted
  Mimulus langsdorffii var. minimus J.K. Henry -- not accepted
  Mimulus langsdorffii var. minor (A. Nelson) Cockerell -- not accepted
  Mimulus langsdorffii var. nasutus (Greene) Jeps. -- not accepted
  Mimulus langsdorffii var. platyphyllus Greene -- not accepted
  Mimulus langsdorffii var. tilingii (Regel) Greene -- not accepted
  Mimulus langsdorfi Donn ex Greene -- not accepted
  Mimulus langsdorfii Donn ex Greene -- not accepted
  Mimulus langsdorfii var. argutus Greene -- not accepted
  Mimulus langsdorfii var. arvensis (Greene) Jeps. -- not accepted
  Mimulus langsdorfii var. californicus Jeps. -- not accepted
  Mimulus langsdorfii var. grandis (Greene) Greene -- not accepted
  Mimulus langsdorfii var. guttatus (DC.) Jeps. -- not accepted
  Mimulus langsdorfii var. insignis (Greene) Greene -- not accepted
  Mimulus langsdorfii var. microphyllus (Benth.) A. Nelson & J.F. Macbr. -- not accepted
  Mimulus langsdorfii var. minimus J.K. Henry -- not accepted
  Mimulus langsdorfii var. minor (A. Nelson) Cockerell -- not accepted
  Mimulus langsdorfii var. nasutus (Greene) Jeps. -- not accepted
  Mimulus langsdorfii var. platyphyllus Greene -- not accepted
  Mimulus langsdorfii var. tilingii (Regel) Greene -- not accepted
  Mimulus latidens (A. Gray) Greene -- accepted -- broadtooth monkeyflower
  Mimulus latifolius A. Gray -- accepted -- broadleaf monkeyflower
  Mimulus laxus Pennell -- not accepted
  Mimulus layneae (Greene) Jeps. -- accepted -- Layne's monkeyflower
  Mimulus leibergii A.L. Grant -- not accepted
  Mimulus leptaleus A. Gray -- accepted -- least monkeyflower, slender monkeyflower
  Mimulus leptanthus (Nutt.) A.L. Grant -- not accepted
  Mimulus lewisii Pursh -- accepted -- Lewis' monkeyflower, purple monkeyflower
  Mimulus linearifolius (A.L. Grant) Pennell -- not accepted
  Mimulus linearis auct. non Benth. -- not accepted
  Mimulus linearis Benth. -- not accepted
  Mimulus longiflorus (Nutt.) A.L. Grant -- not accepted
  Mimulus longiflorus ssp. calycinus (Eastw.) Munz -- not accepted
  Mimulus longiflorus var. calycinus (Eastw.) A.L. Grant -- not accepted
  Mimulus longiflorus var. linearis (Benth.) A.L. Grant -- not accepted
  Mimulus longiflorus var. longiflorus (Nutt.) A.L. Grant -- not accepted
  Mimulus longiflorus var. rutilus A.L. Grant -- not accepted
  Mimulus longulus Greene -- not accepted
  Mimulus lucens Greene -- not accepted
  Mimulus luteus L. -- accepted -- blood-drop emlets, yellow monkey-flower, monkey musk
  Mimulus luteus var. alpinus A. Gray -- not accepted
  Mimulus luteus var. cupreus (hort. ex Dombrain) Hook. -- not accepted
  Mimulus luteus var. depauperatus A. Gray -- not accepted
  Mimulus luteus var. gracilis A. Gray -- not accepted
  Mimulus lyratus Benth. -- not accepted
  Mimulus macranthus Pennell -- not accepted
  Mimulus maguirei Pennell -- not accepted
  Mimulus marmoratus Greene -- not accepted
  Mimulus membranaceus A. Nelson -- not accepted
  Mimulus mephiticus Greene -- accepted -- foul-odor monkeyflower, foul odor monkeyflower
  Mimulus micranthus A. Heller -- not accepted
  Mimulus microcarpus Pennell -- not accepted
  Mimulus microphyllus Benth. -- not accepted
  Mimulus microphyton Pennell -- not accepted
  Mimulus minor A. Nelson -- not accepted
  Mimulus minthodes Greene -- not accepted
  Mimulus minusculus Greene -- not accepted
  Mimulus minutissimus Eastw. -- not accepted
  Mimulus modestus Eastw. -- not accepted
  Mimulus mohavensis Lemmon -- accepted -- Mojave monkey-flower
  Mimulus moniliformis Greene -- not accepted
  Mimulus montioides A. Gray -- accepted -- mountain monkeyflower, mointain monkeyflower
  Mimulus moschatus Douglas ex Lindl. -- accepted -- musk monkeyflower, muskflower
  Mimulus moschatus var. longiflorus A. Gray -- accepted -- muskflower
  Mimulus moschatus var. moniliformis (Greene) Munz -- accepted -- muskflower
  Mimulus moschatus var. moschatus Douglas ex Lindl. -- accepted -- muskflower
  Mimulus moschatus var. pallidiflorus Suksd. -- not accepted
  Mimulus moschatus var. sessilifolius A. Gray -- accepted -- muskflower
  Mimulus multiflorus Pennell -- not accepted
  Mimulus nanus Hook. & Arn. -- accepted -- dwarf purple monkeyflower
  Mimulus nanus ssp. cascadensis Ezell ined. -- not accepted -- dwarf purple monkeyflower
  Mimulus nanus ssp. nanus Hook. & Arn. -- accepted -- dwarf purple monkeyflower
  Mimulus nanus var. bicolor (A. Gray) A. Gray -- not accepted
  Mimulus nanus var. subuniflorus Hook. & Arn. -- not accepted
  Mimulus nasutus Greene -- not accepted
  Mimulus nasutus var. micranthus (A. Heller) A.L. Grant -- not accepted
  Mimulus nevadensis Gand. -- not accepted
  Mimulus norrisii Heckard & Shevock -- accepted -- Kaweah monkeyflower
  Mimulus nudatus Curran ex Greene -- accepted -- bare monkeyflower
  Mimulus ovatus (A. Gray) N.H. Holmgren -- accepted -- Carson monkeyflower, eggleaf monkeyflower
  Mimulus pallidus Salisb. -- not accepted
  Mimulus palmeri A. Gray -- accepted -- Palmer's monkeyflower
  Mimulus palmeri var. androsaceus (Curran ex Greene) A. Gray -- not accepted
  Mimulus paniculatus Greene -- not accepted
  Mimulus pardalis Pennell -- not accepted
  Mimulus parishii Greene -- accepted -- Parish's monkeyflower
  Mimulus parishii Gand. -- not accepted -- Parish's monkeyflower
  Mimulus parryi A. Gray -- accepted -- annual redspot monkey-flower, redspot monkeyflower, annual redspot monkeyflower
  Mimulus parviflorus (Greene) A.L. Grant -- not accepted
  Mimulus parvulus Wooton & Standl. -- not accepted
  Mimulus patulus Pennell -- not accepted -- stalk-leaved monkey-flower
  Mimulus peduncularis Douglas ex Benth. -- not accepted
  Mimulus peduncularis sensu A. Gray -- not accepted
  Mimulus petiolaris Greene -- not accepted
  Mimulus pictus (Curran ex Greene) A. Gray -- accepted -- calico monkeyflower
  Mimulus pilosellus Greene -- not accepted
  Mimulus pilosus (Benth.) S. Watson -- accepted -- false monkeyflower
  Mimulus platycalyx Pennell -- accepted -- widecalyx monkeyflower
  Mimulus platylaemus Pennell -- accepted -- widethroat pink monkeyflower
  Mimulus prattenii Durand -- not accepted
  Mimulus primuloides Benth. -- accepted -- yellow creeping monkey-flower, primrose monkeyflower
  Mimulus primuloides ssp. linearifolius (A.L. Grant) Munz -- not accepted
  Mimulus primuloides ssp. primuloides Benth. -- not accepted -- monkeyflower
  Mimulus primuloides var. linearifolius A.L. Grant -- accepted -- primrose monkeyflower
  Mimulus primuloides var. minimus M. Peck -- not accepted
  Mimulus primuloides var. pilosellus (Greene) Smiley -- not accepted
  Mimulus primuloides var. primuloides Benth. -- accepted -- primrose monkey-flower, primrose monkeyflower
  Mimulus prionophyllus Greene -- not accepted
  Mimulus procerus Greene -- not accepted
  Mimulus puberulus Greene -- not accepted
  Mimulus pubescens Benth. -- not accepted
  Mimulus pulchellus (Drew ex Greene) A.L. Grant -- accepted -- yellowlip pansy monkeyflower
  Mimulus pulsiferae A. Gray -- accepted -- candelabrum monkeyflower
  Mimulus puncticalyx Gand. -- not accepted
  Mimulus puniceus (Nutt.) Steud. -- not accepted
  Mimulus purpureus A.L. Grant -- accepted -- little purple monkeyflower
  Mimulus purpureus var. pauxillus A.L. Grant -- accepted -- little purple monkeyflower
  Mimulus purpureus var. purpureus A.L. Grant -- accepted -- little purple monkeyflower, purple monkey-flower
  Mimulus pygmaeus A.L. Grant -- accepted -- Egg Lake monkey-flower
  Mimulus rattanii A. Gray -- accepted -- Rattan's monkeyflower
  Mimulus rattanii ssp. decurtatus (A.L. Grant) Pennell -- not accepted
  Mimulus rattanii var. decurtatus (A.L. Grant) Pennell -- accepted -- Rattan's monkeyflower
  Mimulus rattanii var. rattanii A. Gray -- accepted -- Rattan's monkeyflower
  Mimulus reifschneiderae Edwin -- not accepted
  Mimulus reniformis Engelm. ex Benth. -- not accepted
  Mimulus ringens L. -- accepted -- Allegheny monkey-flower, Allegheny monkeyflower
  Mimulus ringens var. colpophilus Fernald -- accepted -- Allegheny monkeyflower, square-stemmed monkey-flower
  Mimulus ringens var. congesta Farw. -- not accepted
  Mimulus ringens var. minthodes (Greene) A.L. Grant -- not accepted
  Mimulus ringens var. ringens L. -- accepted -- Allegheny monkeyflower, Allegheny monkey-flower
  Mimulus rivularis Nutt. -- not accepted
  Mimulus rubellus A. Gray -- accepted -- redstem monkey-flower, red monkeyflower, little redstem monkeyflower
  Mimulus rubellus var. breweri (Greene) Jeps. -- not accepted
  Mimulus rubellus var. latiflorus S. Watson -- not accepted
  Mimulus rupicola Coville & A.L. Grant -- accepted -- Death Valley monkeyflower
  Mimulus scouleri Hook. -- not accepted
  Mimulus scouleri var. caespitosus Greene -- not accepted
  Mimulus serotinus Suksd. -- not accepted
  Mimulus shevockii Heckard & Bacig. -- accepted -- Kelso Creek monkey-flower
  Mimulus spissus A.L. Grant -- accepted -- compact monkey-flower, compact monkeyflower
  Mimulus spissus var. lincolnensis Edwin -- not accepted
  Mimulus stamineus A.L. Grant -- not accepted
  Mimulus subreniformis Greene -- not accepted
  Mimulus subsecundus A. Gray -- accepted -- onesided monkeyflower
  Mimulus subsecundus var. constrictus A.L. Grant -- not accepted
  Mimulus subsecundus var. viscidus (Congdon) A.L. Grant -- not accepted
  Mimulus subulatus (A.L. Grant) Pennell -- not accepted
  Mimulus subuniflorus (Hook. & Arn.) Jeps. -- not accepted
  Mimulus suksdorfii A. Gray -- accepted -- miniature monkey-flower, Suksdorf's monkeyflower
  Mimulus tenellus Nutt. ex A. Gray -- not accepted
  Mimulus thermalis A. Nelson -- not accepted
  Mimulus tilingii Regel -- accepted -- subalpine monkey-flower, subalpine monkeyflower, Tiling's monkeyflower
  Mimulus tilingii var. caespitosus (Greene) A.L. Grant -- accepted -- subalpine monkeyflower
  Mimulus tilingii var. corallinus (Greene) A.L. Grant -- not accepted
  Mimulus tilingii var. tilingii Regel -- accepted -- Tiling's monkeyflower
  Mimulus tillingii Regel -- not accepted
  Mimulus tolmiei (Benth.) Rydb. -- not accepted
  Mimulus torreyi A. Gray -- accepted -- Torrey's monkeyflower
  Mimulus traskiae A.L. Grant -- accepted -- Santa Catalina monkey-flower
  Mimulus tricolor Hartw. ex Lindl. -- accepted -- tricolor monkeyflower
  Mimulus tricolor var. angustatus (A. Gray) A. Gray -- not accepted
  Mimulus trisulcatus Pennell -- not accepted
  Mimulus unimaculatus Pennell -- not accepted
  Mimulus verbenaceus Greene -- not accepted -- crimson monkey-flower, crimson monkeyflower
  Mimulus veronicifolius Greene -- not accepted
  Mimulus viscidus Congdon -- accepted -- sticky monkeyflower
  Mimulus viscidus ssp. constrictus (A.L. Grant) Munz -- accepted -- sticky monkeyflower
  Mimulus viscidus ssp. viscidus Congdon -- accepted -- sticky monkeyflower
  Mimulus viscosus Moench -- not accepted
  Mimulus washingtonensis Gand. -- accepted -- Washington monkeyflower
  Mimulus washoensis Edwin -- not accepted
  Mimulus whipplei A.L. Grant -- accepted -- Whipple's monkey-flower
  Mimulus whitneyi A. Gray -- accepted -- harlequin monkeyflower
  Mimulus wolfii Eastw. -- not accepted
  Mimulus X bartonianus Rivoire -- accepted -- monkeyflower
  Misopates Raf. -- accepted
  Misopates orontium (L.) Raf. -- accepted -- linearleaf snapdragon
  Mohavea A. Gray -- accepted
  Mohavea breviflora Coville -- accepted -- golden desert-snapdragon, golden desert snapdragon
  Mohavea confertiflora (Benth.) A. Heller -- accepted -- ghostflower, ghost flower
  Moldavica moldavica (L.) Britton -- not accepted
  Moldavica parviflora (Nutt.) Britton -- not accepted
  Moldavica thymiflora (L.) Rydb. -- not accepted
  Moluccella L. -- accepted
  Moluccella laevis L. -- accepted -- shellflower
  Monarda L. -- accepted -- beebalm
  Monarda allophylla Michx. -- not accepted
  Monarda aristata Nutt. -- not accepted
  Monarda austromontana Epling -- not accepted
  Monarda bradburiana L.C. Beck -- accepted -- wildbergamot beebalm, eastern beebalm
  Monarda citriodora Cerv. ex Lag. -- accepted -- lemon mint, lemon beebalm
  Monarda citriodora ssp. austromontana (Epling) Scora -- not accepted -- oregano, lemon beebalm
  Monarda citriodora ssp. citriodora Cerv. ex Lag. -- not accepted -- lemon beebalm
  Monarda citriodora ssp. citriodora var. attenuata Scora -- not accepted -- lemon beebalm
  Monarda citriodora ssp. citriodora var. citriodora Cerv. ex Lag. -- not accepted -- lemon beebalm
  Monarda citriodora ssp. citriodora var. parva Scora -- not accepted -- lemon beebalm
  Monarda citriodora var. attenuata Scora -- not accepted
  Monarda citriodora var. austromontana (Epling) B.L. Turner -- accepted -- lemon beebalm
  Monarda citriodora var. citriodora Cerv. ex Lag. -- accepted -- lemon beebalm
  Monarda citriodora var. parva Scora -- accepted -- lemon beebalm
  Monarda clinopodia L. -- accepted -- white bergamot
  Monarda clinopodioides A. Gray -- accepted -- basil beebalm
  Monarda didyma L. -- accepted -- Oswego tea, monarde écarlate, scarlet beebalm
  Monarda dispersa Small -- not accepted
  Monarda dressleri Scora -- accepted -- Dressler's beebalm
  Monarda fistulosa L. -- accepted -- wildbergamot horsemint, Oswego-tea, mintleaf beebalm, wildbergamot beebalm, wild bergamot
  Monarda fistulosa Sims -- not accepted -- wildbergamot beebalm
  Monarda fistulosa ssp. brevis (Fosberg & Artz) Scora -- not accepted -- wild bergamot
  Monarda fistulosa ssp. fistulosa L. -- not accepted -- Oswego-tea, wild bergamot beebalm, wild bergamot
  Monarda fistulosa ssp. fistulosa var. fistulosa L. -- not accepted -- wild bergamot, Oswego-tea, wildbergamot beebalm
  Monarda fistulosa ssp. fistulosa var. longepetiolata B. Boivin -- not accepted -- wildbergamot beebalm
  Monarda fistulosa ssp. fistulosa var. maheuxii B. Boivin -- not accepted -- mintleaf beebalm
  Monarda fistulosa ssp. fistulosa var. menthifolia (Graham) Fernald -- not accepted -- wild bergamot, Oswego-tea, mintleaf beebalm
  Monarda fistulosa ssp. fistulosa var. mollis (L.) Benth. -- not accepted -- wild bergamot, Oswego-tea
  Monarda fistulosa ssp. fistulosa var. rubra A. Gray -- not accepted -- wild bergamot
  Monarda fistulosa ssp. fistulosa var. stipitatoglandulosa (Waterf.) Scora -- not accepted -- wild bergamot
  Monarda fistulosa var. brevis Fosberg & Artz -- accepted
  Monarda fistulosa var. clinopodia (L.) Cooperr. -- not accepted
  Monarda fistulosa var. fistulosa L. -- accepted -- wild bergamot
  Monarda fistulosa var. longepetiolata B. Boivin -- accepted
  Monarda fistulosa var. mahuexii B. Boivin -- accepted
  Monarda fistulosa var. menthifolia (Graham) Fernald -- accepted -- mintleaf bergamot, wild bergamot
  Monarda fistulosa var. mollis (L.) Benth. -- accepted -- wild bergamot
  Monarda fistulosa var. rubra A. Gray -- accepted -- wild bergamot
  Monarda fistulosa var. stipitatoglandulosa (Waterf.) Scora -- not accepted -- wild bergamot
  Monarda fruticulosa Epling -- accepted -- spotted beebalm
  Monarda humilis (Torr.) Prather & J.A. Keith -- accepted
  Monarda lasiodonta (A. Gray) Small -- not accepted
  Monarda lindheimeri Engelm. & A. Gray ex A. Gray -- accepted -- Lindheimer's beebalm
  Monarda maritima (Cory) Correll -- accepted
  Monarda media Willd. -- accepted -- purple bergamot
  Monarda menthifolia Graham -- not accepted
  Monarda mollis L. -- not accepted
  Monarda pectinata Nutt. -- accepted -- horse mint, plains beebalm, spotted beebalm, miners lettuce, pony beebalm
  Monarda punctata L. -- accepted -- spotted beebalm
  Monarda punctata ssp. arkansana E.M. McClint. & Epling -- not accepted
  Monarda punctata ssp. coryi E.M. McClint. & Epling -- not accepted
  Monarda punctata ssp. fruticulosa (Epling) Scora -- not accepted -- spotted beebalm
  Monarda punctata ssp. immaculata Pennell -- not accepted -- spotted beebalm
  Monarda punctata ssp. intermedia E.M. McClint. & Epling -- not accepted
  Monarda punctata ssp. maritima (Cory) Scora -- not accepted -- seaside beebalm
  Monarda punctata ssp. occidentalis Epling -- not accepted
  Monarda punctata ssp. punctata L. -- not accepted -- spotted beebalm
  Monarda punctata ssp. punctata var. arkansana (E.M. McClint. & Epling) Shinners -- not accepted -- spotted beebalm
  Monarda punctata ssp. punctata var. correllii B.L. Turner -- not accepted
  Monarda punctata ssp. punctata var. coryi (E.M. McClint. & Epling) Shinners -- not accepted -- spotted beebalm, Cory's beebalm
  Monarda punctata ssp. punctata var. intermedia (E.M. McClint. & Epling) Waterf. -- not accepted -- spotted beebalm, intermediate beebalm
  Monarda punctata ssp. punctata var. lasiodonta A. Gray -- not accepted -- spotted beebalm
  Monarda punctata ssp. punctata var. occidentalis (Epling) E.J. Palmer & Steyerm. -- not accepted -- spotted beebalm, western beebalm
  Monarda punctata ssp. punctata var. punctata L. -- not accepted -- spotted beebalm
  Monarda punctata ssp. punctata var. stanfieldii (Small) Cory -- not accepted -- Stanfield's beebalm
  Monarda punctata ssp. punctata var. villicaulis (Pennell) E.J. Palmer & Steyerm. -- not accepted -- spotted beebalm
  Monarda punctata ssp. punctata var. viridissima (Correll) Scora -- not accepted -- spotted beebalm
  Monarda punctata ssp. villicaulis Pennell -- not accepted
  Monarda punctata var. arkansana (E.M. McClint. & Epling) Shinners -- accepted -- spotted beebalm
  Monarda punctata var. correllii B.L. Turner -- accepted -- spotted beebalm
  Monarda punctata var. coryi (E.M. McClint. & Epling) Shinners -- accepted -- spotted beebalm
  Monarda punctata var. fruticulosa (Epling) Scora -- not accepted
  Monarda punctata var. immaculata (Pennell) Scora -- accepted
  Monarda punctata var. intermedia (E.M. McClint. & Epling) Waterf. -- accepted -- spotted beebalm
  Monarda punctata var. lasiodonta A. Gray -- accepted -- spotted beebalm
  Monarda punctata var. leucantha Nash -- not accepted
  Monarda punctata var. maritima Cory -- not accepted
  Monarda punctata var. occidentalis (Epling) E.J. Palmer & Steyerm. -- accepted -- spotted beebalm
  Monarda punctata var. punctata L. -- accepted -- spotted beebalm
  Monarda punctata var. stanfieldii (Small) Cory -- not accepted
  Monarda punctata var. villicaulis (Pennell) E.J. Palmer & Steyerm. -- accepted -- spotted beebalm
  Monarda rigida Raf. -- not accepted
  Monarda russeliana Nutt. ex Sims -- accepted -- Russell's henbit, redpurple beebalm
  Monarda scabra L.C. Beck -- not accepted
  Monarda stanfieldii Small -- accepted -- Stanfield's beebalm
  Monarda stipitatoglandulosa Waterf. -- accepted -- wild bergamot
  Monarda tenuiaristata (A. Gray) Small -- not accepted
  Monarda villosa M. Martens -- not accepted
  Monarda virgata Raf. -- not accepted
  Monarda viridissima Correll -- accepted -- green beebalm
  Monarda X medioides Duncan -- accepted -- beebalm
  Monardella Benth. -- accepted
  Monardella antonina Hardham -- accepted -- San Antonio Hills monardella
  Monardella antonina ssp. antonina Hardham -- accepted -- San Antonio Hills monardella
  Monardella antonina ssp. benitensis (Hardham) Jokerst -- accepted -- San Benito monardella
  Monardella arizonica Epling -- accepted -- Arizona mint, Arizona monardella
  Monardella australis Abrams -- accepted -- southern monardella
  Monardella beneolens Shevock, Ertter & Jokerst -- accepted -- sweet-smelling monardella
  Monardella benitensis Hardham -- not accepted
  Monardella breweri A. Gray -- accepted -- Brewer's monardella
  Monardella candicans Benth. -- accepted -- Sierra monardella
  Monardella cinerea Abrams -- accepted -- gray monardella
  Monardella crispa Elmer -- accepted -- crisped monardella, crisp monardella
  Monardella discolor Greene -- not accepted
  Monardella douglasii Benth. -- accepted -- Douglas' monardella
  Monardella douglasii ssp. douglasii Benth. -- accepted -- Douglas' monardella
  Monardella douglasii ssp. venosa (Torr.) Jokerst -- accepted -- veiny monardella
  Monardella douglasii var. douglasii Benth. -- not accepted -- Douglas' mountainbalm
  Monardella douglasii var. venosa (Torr.) Jeps. -- not accepted -- veiny monardella
  Monardella exilis (A. Gray) Greene -- accepted -- desert monardella
  Monardella follettii (Jeps.) Jokerst -- accepted -- Follett's monardella
  Monardella frutescens (Hoover) Jokerst -- accepted -- San Luis Obispo monardella
  Monardella glauca Greene -- accepted -- blue monardella, gray monardella, pale monardella
  Monardella hypoleuca A. Gray -- accepted -- thickleaf monardella
  Monardella hypoleuca ssp. hypoleuca A. Gray -- accepted -- thickleaf monardella
  Monardella hypoleuca ssp. lanata (Abrams) Munz -- accepted -- felt leaf rock-mint, feltleaf monardella
  Monardella lanata Abrams -- not accepted
  Monardella lanceolata A. Gray -- accepted -- mustang mountainbalm, mustang mint, mustang monardella
  Monardella lanceolata var. glandulifera I.M. Johnst. -- accepted -- mustang monardella
  Monardella lanceolata var. lanceolata A. Gray -- accepted -- mustang monardella, mustang mint
  Monardella lanceolata var. microcephala A. Gray -- accepted -- mustang monardella
  Monardella leucocephala A. Gray -- accepted -- Merced monardella
  Monardella linoides A. Gray -- accepted -- flax-leaf mountainbalm, narrowleaf monardella, flaxleaf monardella
  Monardella linoides ssp. linoides A. Gray -- accepted -- flax-leaf mountainbalm, flaxleaf mountainbalm, flaxleaf monardella
  Monardella linoides ssp. oblonga (Greene) Abrams -- accepted -- flaxleaf monardella, flax-like monardella
  Monardella linoides ssp. stricta (Parish) Epling -- accepted -- flaxleaf mountainbalm, flaxleaf monardella
  Monardella linoides ssp. viminea (Greene) Abrams -- accepted -- willowy monardella
  Monardella macrantha A. Gray -- accepted -- red monardella
  Monardella macrantha ssp. hallii (Abrams) Abrams -- accepted -- Hall's monardella
  Monardella macrantha ssp. macrantha A. Gray -- accepted -- red monardella
  Monardella macrantha ssp. nana (A. Gray) Epling -- not accepted
  Monardella macrantha var. arida H.M. Hall -- not accepted
  Monardella macrantha var. hallii Abrams -- not accepted
  Monardella macrantha var. tenuiflora S. Watson ex A. Gray -- not accepted
  Monardella nana A. Gray -- accepted -- yellow monardella
  Monardella nana ssp. arida (H.M. Hall) Abrams -- accepted -- yellow monardella
  Monardella nana ssp. leptosiphon (Torr.) Abrams -- accepted -- San Felipe monardella
  Monardella nana ssp. nana A. Gray -- accepted -- yellow monardella
  Monardella nana ssp. tenuiflora (S. Watson ex A. Gray) Abrams -- accepted -- yellow monardella
  Monardella neglecta Greene -- not accepted
  Monardella odoratissima Benth. -- accepted -- Pacific monardella, mountain monardella
  Monardella odoratissima ssp. australis (Abrams) Epling -- not accepted
  Monardella odoratissima ssp. discolor (Greene) Epling -- accepted -- mountain monardella
  Monardella odoratissima ssp. euodoratissima Epling -- not accepted
  Monardella odoratissima ssp. glauca (Greene) Epling -- not accepted
  Monardella odoratissima ssp. odoratissima Benth. -- accepted -- alpine mountainbalm, mountain monardella
  Monardella odoratissima ssp. pallida (A. Heller) Epling -- accepted -- alpine mountainbalm, mountain monardella
  Monardella odoratissima ssp. parvifolia (Greene) Epling -- not accepted
  Monardella odoratissima ssp. pinetorum (A. Heller) Epling -- not accepted
  Monardella odoratissima var. discolor (Greene) H. St. John -- not accepted
  Monardella odoratissima var. follettii Jeps. -- not accepted
  Monardella odoratissima var. glauca (Greene) H. St. John -- not accepted
  Monardella odoratissima var. neglecta Cronquist -- not accepted
  Monardella odoratissima var. ovata (Greene) Jeps. -- not accepted
  Monardella odoratissima var. parvifolia (Greene) Jeps. -- not accepted
  Monardella palmeri A. Gray -- accepted -- Palmer's monardella
  Monardella pringlei A. Gray -- accepted -- Pringle's monardella, Pringle monardella
  Monardella purpurea Howell -- accepted -- serpentine monardella
  Monardella robisonii Epling ex Munz -- accepted -- Robison's monardella
  Monardella saxicola I.M. Johnst. -- not accepted
  Monardella sheltonii (Torr.) Howell -- accepted -- Shelton's monardella
  Monardella siskiyouensis Hardham -- accepted -- Siskiyou monardella
  Monardella stebbinsii Hardham & Bartel -- accepted -- Feather River monardella
  Monardella stoneana Elvin & Sanders -- accepted
  Monardella subglabra (Hoover) Hardham -- not accepted
  Monardella undulata Benth. -- accepted -- curlyleaf monardella
  Monardella undulata var. frutescens Hoover -- not accepted
  Monardella undulata var. undulata Benth. -- not accepted -- curlyleaf mountainbalm
  Monardella villosa Benth. -- accepted -- coyote mint
  Monardella villosa ssp. franciscana (Elmer) Jokerst -- accepted -- coyote mint
  Monardella villosa ssp. globosa (Greene) Jokerst -- accepted -- robust coyote mint
  Monardella villosa ssp. neglecta (Greene) Epling -- not accepted
  Monardella villosa ssp. obispoensis (Hoover) Jokerst -- accepted -- San Luis Obispo coyote mint
  Monardella villosa ssp. sheltonii (Torr.) Epling -- not accepted
  Monardella villosa ssp. subserrata (Greene) Epling -- not accepted
  Monardella villosa ssp. villosa Benth. -- accepted -- coyote mint
  Monardella villosa ssp. villosa var. franciscana (Elmer) Epling -- not accepted -- coyote mountainbalm
  Monardella villosa ssp. villosa var. obispoensis Hoover -- not accepted -- coyote mountainbalm
  Monardella villosa ssp. villosa var. villosa Benth. -- not accepted -- coyote mountainbalm
  Monardella villosa var. franciscana (Elmer) Epling -- not accepted
  Monardella villosa var. obispoensis Hoover -- not accepted
  Monardella villosa var. subglabra Hoover -- not accepted
  Monardella viridis Jeps. -- accepted -- green monardella
  Monardella viridis ssp. saxicola (I.M. Johnst.) Ewan -- accepted -- rock monardella
  Monardella viridis ssp. viridis Jeps. -- accepted -- green monardella
  Monechma pilosella Nees -- not accepted
  Mosla (Benth.) Buch.-Ham. ex Maxim. -- accepted -- mosla
  Mosla dianthera (Buch.-Ham. ex Roxb.) Maxim. -- accepted -- miniature beefsteak, miniature beefsteakplant
  Myoporum Sol. ex G. Forst. -- accepted
  Myoporum boninense Koidz. -- accepted
  Myoporum laetum G. Forst. -- accepted -- ngaio tree
  Myoporum parvifolium R. Br. -- accepted -- slender myoporum
  Myoporum sandwicense A. Gray -- accepted -- naio
  Myoporum sandwicense ssp. st.-johnii Webster -- not accepted
  Myoporum sandwicense var. degeneri Webster -- not accepted
  Myoporum sandwicense var. fauriei (Levl.) Kraenzlin -- not accepted
  Myoporum sandwicense var. lanaiense Webster -- not accepted
  Myoporum sandwicense var. sandwicense A. Gray -- not accepted
  Myoporum sandwicense var. stellatum Webster -- not accepted
  Myzorrhiza californica (Cham. & Schltdl.) Rydb. -- not accepted
  Myzorrhiza cooperi (A. Gray) Rydb. -- not accepted
  Myzorrhiza corymbosa Rydb. -- not accepted
  Myzorrhiza ludoviciana (Nutt.) Rydb. -- not accepted
  Myzorrhiza multiflora (Nutt.) Rydb. -- not accepted
  Myzorrhiza pinorum (Geyer ex Hook.) Rydb. -- not accepted
  Myzorrhiza tuberosa (A. Gray) Rydb. -- not accepted
  Nashia Millsp. -- accepted
  Nashia inaguensis Millsp. -- accepted -- el tuque
  Nelsonia R. Br. -- accepted
  Nelsonia brunelloides (Lam.) Kuntze -- not accepted
  Nelsonia canescens (Lam.) Spreng. -- accepted -- blue pussyleaf
  Nemesia Vent. -- accepted
  Nemesia strumosa Benth. -- accepted -- capejewels
  Neogaerrhinum Rothm. -- accepted
  Neogaerrhinum filipes (A. Gray) Rothm. -- accepted -- yellow twining snapdragon, yellow twining-snapdragon, Filipes' snapdragon
  Neogaerrhinum kelloggii (Greene) Thieret -- not accepted
  Neogaerrhinum strictum (Hook. & Arn.) Rothm. -- accepted -- Kellogg's snapdragon
  Nepeta L. -- accepted -- catnip
  Nepeta camphorata Boiss. & Heldr. -- accepted
  Nepeta cataria L. -- accepted -- catmint, catwort, field balm, catnip
  Nepeta grandiflora M. Bieb. -- accepted -- Caucasus catmint
  Nepeta hederacea (L.) Trevis. -- not accepted
  Nepeta mussinii Spreng. ex Henckel -- not accepted -- Persian catmint
  Nepeta racemosa Lam. -- accepted -- raceme catnip
  Nestegis Raf. -- accepted
  Nestegis sandwicensis (A. Gray) O. Deg. & I. Deg. & L.A.S. Johnson -- accepted -- Hawai'i olive
  Nicoteba betonica (L.) Lindau -- not accepted
  Nomaphila Blume -- accepted
  Nomaphila stricta (Vahl) Nees -- accepted -- stiff beargrass
  Noronhia (Stadman) Thouars -- accepted
  Noronhia emarginata (Lam.) Thouars -- accepted -- Madagascar olive
  Nothochelone (A. Gray) Straw -- accepted
  Nothochelone nemorosa (Douglas ex Lindl.) Straw -- accepted -- woodland beardtongue
  Nuttallanthus D.A. Sutton -- accepted -- toadflax
  Nuttallanthus canadensis (L.) D.A. Sutton -- accepted -- Canada toadflax, oldfield-toadflax, oldfield toadflax
  Nuttallanthus floridanus (Chapm.) D.A. Sutton -- accepted -- Apalachicola toadflax
  Nuttallanthus texanus (Scheele) D.A. Sutton -- accepted -- Texas toadflax
  Ocimum L. -- accepted -- basil
  Ocimum americanum L. -- accepted -- American basil, hoary basil
  Ocimum americanum -- not accepted
  Ocimum basilicum L. -- accepted -- sweet basil
  Ocimum campechianum Mill. -- accepted -- least basil
  Ocimum canum Sims -- not accepted -- hoary basil
  Ocimum gratissimum L. -- accepted -- African basil
  Ocimum kilimandscharicum Baker ex Gürke -- accepted -- hoary basil
  Ocimum micranthum Willd. -- not accepted
  Ocimum sanctum L. -- not accepted
  Ocimum tenuiflorum L. -- accepted -- holy basil
  Ocimum viride Willd. -- not accepted
  Odontites Ludwig -- accepted
  Odontites serotina (Lam.) Dumort. -- not accepted
  Odontites serotinus (Lam.) Dumort. -- not accepted
  Odontites vernus (Bellardi) Dumort. -- accepted -- red bartsia
  Odontites vernus ssp. serotinus (Lam.) Corb. -- not accepted -- red bartsia
  Odontites vernus ssp. vernus (Bellardi) Dumort. -- not accepted
  Odontites vulgaris Moench -- accepted
  Odontonema Nees -- accepted -- toothedthread
  Odontonema cuspidatum (Nees) Kuntze -- accepted -- mottled toothedthread
  Odontonema nitidum (Jacq.) Kuntze -- accepted -- shrubby toothedthread
  Odontonema strictum (Nees) Kuntze -- not accepted
  Odontonema tubiforme (Bertol.) Kuntze -- not accepted -- firespike
  Olea L. -- accepted -- olive
  Olea africana Mill. -- not accepted
  Olea chrysophylla Lam. -- not accepted
  Olea europaea L. -- accepted -- olive
  Olea europaea ssp. africana (Mill.) P. Green -- not accepted -- African olive
  Olea europaea ssp. cuspidata (Wall. ex G. Don) Cif. -- accepted -- African olive
  Olea europaea ssp. europaea L. -- accepted -- European olive
  Olea ferruginea Royle -- not accepted
  Olea verrucosa (Willd.) Link -- not accepted
  Oleaceae -- accepted -- olives
  Oplonia Raf. -- accepted
  Oplonia microphylla (Lam.) Stearn -- accepted -- thicketwort
  Oplonia spinosa (Jacq.) Raf. -- accepted -- pricklybush
  Origanum L. -- accepted
  Origanum heracleoticum L. -- not accepted
  Origanum majorana L. -- accepted -- sweet marjoram
  Origanum maru L. -- not accepted -- Egyptian marjoram
  Origanum onites L. -- accepted -- pot marjoram
  Origanum tyttanthum Gontsch. -- not accepted
  Origanum vulgare L. -- accepted -- oregano
  Origanum vulgare ssp. gracile (K. Koch) Ietsw. -- accepted
  Orobanchaceae -- accepted -- broomrape
  Orobanche L. -- accepted -- broomrape
  Orobanche americana L. -- not accepted
  Orobanche bulbosa (A. Gray) Beck -- accepted -- chaparral broomrape
  Orobanche californica Cham. & Schltdl. -- accepted -- California broomrape
  Orobanche californica ssp. californica Cham. & Schltdl. -- accepted -- California broomrape
  Orobanche californica ssp. condensa Heckard -- accepted -- California broomrape
  Orobanche californica ssp. feudgei (Munz) Heckard -- accepted -- California broomrape
  Orobanche californica ssp. grandis Heckard -- accepted -- California broomrape
  Orobanche californica ssp. grayana (Beck) Heckard -- accepted -- Gray's broomrape
  Orobanche californica ssp. jepsonii (Munz) Heckard -- accepted -- Jepson's broomrape
  Orobanche californica var. claremontensis Munz -- not accepted
  Orobanche californica var. corymbosa (Rydb.) Munz -- not accepted
  Orobanche californica var. grayana (Beck) Cronquist -- not accepted
  Orobanche californica var. parishii Jeps. -- not accepted
  Orobanche cernua Loefl. -- accepted -- nodding broomrape
  Orobanche cooperi (A. Gray) A. Heller -- accepted -- Cooper's broomrape, desert broomrape
  Orobanche cooperi ssp. cooperi (A. Gray) A. Heller -- accepted -- Cooper's broomrape, desert broomrape
  Orobanche cooperi ssp. latiloba (Munz) T.S. Collins ined. -- not accepted -- Cooper's broomrape, desert broomrape
  Orobanche corymbosa (Rydb.) Ferris -- accepted -- Rydberg's broomrape, flat-top broomrape
  Orobanche corymbosa ssp. corymbosa (Rydb.) Ferris -- accepted -- flattop broomrape, flat-top broomrape
  Orobanche corymbosa ssp. mutabilis Heckard -- accepted -- flat-top broomrape
  Orobanche crenata Forssk. -- accepted -- bean broomrape
  Orobanche dugesii (S. Watson) Munz -- accepted -- Duges' broomrape
  Orobanche fasciculata Nutt. -- accepted -- tufted broomrape, clustered broom-rape, purple broomrape, clustered broomrape
  Orobanche fasciculata var. franciscana Achey -- not accepted
  Orobanche fasciculata var. lutea (Parry) Achey -- not accepted
  Orobanche fasciculata var. subulata Goodman -- not accepted
  Orobanche fasciculata var. typica Achey -- not accepted
  Orobanche grayana Beck -- not accepted
  Orobanche grayana var. feudgei Munz -- not accepted
  Orobanche grayana var. jepsonii Munz -- not accepted
  Orobanche grayana var. nelsonii Munz -- not accepted
  Orobanche grayana var. violacea (Eastw.) Munz -- not accepted
  Orobanche hederae Duby -- accepted -- ivy broomrape
  Orobanche ludoviciana Nutt. -- accepted -- Louisiana broom-rape, Louisiana broomrape
  Orobanche ludoviciana ssp. ludoviciana Nutt. -- accepted -- Louisiana broom-rape, sand broomrape, Louisiana broomrape
  Orobanche ludoviciana ssp. multiflora (Nutt.) T.S. Collins ex H.L. White & W.C. Holmes -- accepted -- manyflowered broomrape, Louisiana broomrape, manyflower broomrape
  Orobanche ludoviciana var. arenosa (Suksd.) Cronquist -- not accepted
  Orobanche ludoviciana var. cooperi (A. Gray) Beck -- not accepted
  Orobanche ludoviciana var. genuina Beck -- not accepted
  Orobanche ludoviciana var. latiloba Munz -- not accepted
  Orobanche ludoviciana var. multiflora (Nutt.) Beck -- not accepted
  Orobanche ludoviciana var. valida (Jeps.) Munz -- not accepted
  Orobanche minor Sm. -- accepted -- small broomrape, hellroot
  Orobanche multicaulis Brandegee -- accepted -- spiked broomrape
  Orobanche multicaulis ssp. palmeri (Munz) Collins, ined. -- not accepted -- Palmer's broomrape
  Orobanche multicaulis var. genuina Munz -- not accepted
  Orobanche multicaulis var. multicaulis Brandegee -- accepted
  Orobanche multicaulis var. palmeri Munz -- accepted
  Orobanche multiflora Nutt. -- not accepted
  Orobanche multiflora var. arenosa (Suksd.) Munz -- not accepted
  Orobanche multiflora var. pringlei Munz -- not accepted
  Orobanche multiflora var. typica Munz -- not accepted
  Orobanche multiflora var. xanthochroa (A. Nelson & Cockerell) Munz -- not accepted
  Orobanche parishii (Jeps.) Heckard -- accepted -- Parish's broomrape
  Orobanche parishii ssp. brachyloba Heckard -- accepted -- Parish's broomrape, short-lobed broomrape
  Orobanche parishii ssp. parishii (Jeps.) Heckard -- accepted -- Parish's broomrape
  Orobanche pinorum Geyer ex Hook. -- accepted -- conifer broomrape
  Orobanche porphyrantha Beck -- not accepted
  Orobanche purpurea Jacq. -- not accepted
  Orobanche ramosa L. -- accepted -- branched broomrape, hemp broomrape
  Orobanche riparia L.T. Collins -- accepted -- river broomrape
  Orobanche sedii (Suksd.) Fernald -- not accepted
  Orobanche terrae-novae Fernald -- not accepted
  Orobanche uniflora L. -- accepted -- naked broom-rape, naked broomrape, oneflowered broomrape
  Orobanche uniflora ssp. occidentalis (Greene) Abrams ex Ferris -- not accepted
  Orobanche uniflora var. minuta (Suksd.) Beck -- not accepted
  Orobanche uniflora var. occidentalis (Greene) Roy L. Taylor & MacBryde -- not accepted
  Orobanche uniflora var. purpurea (A. Heller) Achey -- not accepted
  Orobanche uniflora var. sedii (Suksd.) Achey -- not accepted
  Orobanche uniflora var. terrae-novae (Fernald) Achey -- not accepted
  Orobanche uniflora var. typica Achey -- not accepted
  Orobanche uniflora var. uniflora L. -- not accepted
  Orobanche valida Jeps. -- accepted -- Rock Creek broomrape
  Orobanche valida ssp. howellii Heckard & L.T. Collins -- accepted -- Howell's broomrape
  Orobanche valida ssp. valida Jeps. -- accepted -- Rock Creek broomrape
  Orobanche vallicola (Jeps.) Heckard -- accepted -- hillside broomrape
  Orobanche xanthochroa A. Nelson & Cockerell -- not accepted
  Orthocarpus Nutt. -- accepted -- owl's-clover, owlclover
  Orthocarpus attenuatus A. Gray -- not accepted
  Orthocarpus barbatus J.S. Cotton -- accepted -- Grand Coulee owl's-clover
  Orthocarpus bracteosus Benth. -- accepted -- rosy owl's-clover
  Orthocarpus bracteosus var. albus D.D. Keck -- not accepted
  Orthocarpus brevistylus Hoover -- not accepted
  Orthocarpus campestris Benth. -- not accepted
  Orthocarpus campestris var. succulentus Hoover -- not accepted
  Orthocarpus castillejoides Benth. -- not accepted
  Orthocarpus castillejoides var. castillejoides Benth. -- not accepted -- johnnynip
  Orthocarpus castillejoides var. humboldtiensis D.D. Keck -- not accepted
  Orthocarpus castillejoides var. insalutatus Jeps. -- not accepted
  Orthocarpus copelandii Eastw. -- not accepted
  Orthocarpus copelandii var. cryptanthus (Piper) D.D. Keck -- not accepted
  Orthocarpus cuspidatus Greene -- accepted -- Siskiyou Mountain owlclover, toothed owl's-clover
  Orthocarpus cuspidatus ssp. copelandii (Eastw.) T.I. Chuang & Heckard -- accepted -- Copeland's owlclover, Copeland's owl's-clover
  Orthocarpus cuspidatus ssp. cryptanthus (Piper) T.I. Chuang & Heckard -- accepted -- cryptantha owl's-clover, cryptantha owlclover
  Orthocarpus cuspidatus ssp. cuspidatus Greene -- accepted -- Siskiyou Mountain owl's-clover
  Orthocarpus densiflorus Benth. -- not accepted
  Orthocarpus densiflorus var. densiflorus Benth. -- not accepted -- Sierran foothill owlclover
  Orthocarpus densiflorus var. gracilis (Benth.) D.D. Keck -- not accepted
  Orthocarpus densiflorus var. noctuinus (Eastw.) J.T. Howell -- not accepted
  Orthocarpus densiflorus var. obispoensis D.D. Keck -- not accepted
  Orthocarpus erianthus Benth. -- not accepted
  Orthocarpus erianthus var. erianthus Benth. -- not accepted -- johnnytuck
  Orthocarpus erianthus var. gratiosus Jeps. & J.P. Tracy -- not accepted
  Orthocarpus erianthus var. micranthus (Greene ex A. Heller) Jeps. -- not accepted
  Orthocarpus erianthus var. roseus A. Gray -- not accepted
  Orthocarpus exsertus A. Heller -- not accepted
  Orthocarpus faucibarbatus A. Gray -- not accepted
  Orthocarpus faucibarbatus ssp. albidus D.D. Keck -- not accepted
  Orthocarpus faucibarbatus var. albidus (D.D. Keck) J.T. Howell -- not accepted
  Orthocarpus faucibarbatus var. faucibarbatus A. Gray -- not accepted -- bearded owlclover
  Orthocarpus floribundus Benth. -- not accepted
  Orthocarpus hispidus Benth. -- not accepted
  Orthocarpus imbricatus Torr. ex S. Watson -- accepted -- mountain owl's-clover
  Orthocarpus lacerus Benth. -- not accepted
  Orthocarpus lasiorhynchus A. Gray -- not accepted
  Orthocarpus lineariilobus Benth. -- not accepted
  Orthocarpus linearilobus Benth. -- not accepted
  Orthocarpus lithospermoides Benth. -- not accepted
  Orthocarpus lithospermoides var. bicolor (A. Heller) Jeps. -- not accepted
  Orthocarpus lithospermoides var. lithospermoides Benth. -- not accepted -- creamsacs
  Orthocarpus luteus Nutt. -- accepted -- golden-tongue owl-clover, yellow owlclover, yellow owl's-clover
  Orthocarpus micranthus Greene ex A. Heller -- not accepted
  Orthocarpus pachystachyus A. Gray -- accepted -- Shasta orthocarpus, Shasta owl's-clover
  Orthocarpus pilosus S. Watson -- not accepted
  Orthocarpus purpurascens Benth. -- not accepted
  Orthocarpus purpurascens var. latifolius S. Watson -- not accepted
  Orthocarpus purpurascens var. ornatus Jeps. -- not accepted
  Orthocarpus purpurascens var. pallidus D.D. Keck -- not accepted
  Orthocarpus purpurascens var. palmeri A. Gray -- not accepted
  Orthocarpus purpurascens var. purpurascens Benth. -- not accepted -- red owlclover
  Orthocarpus purpurascens var. venustus (A. Heller) D.D. Keck -- not accepted
  Orthocarpus purpureoalbus A. Gray ex S. Watson -- accepted -- purple owlclover, purplewhite owlclover, purplewhite owl's-clover
  Orthocarpus pusillus Benth. -- not accepted
  Orthocarpus pusillus var. densiuscuus (Gand.) D.D. Keck -- not accepted
  Orthocarpus succulentus (Hoover) Hoover -- not accepted
  Orthocarpus tenuifolius (Pursh) Benth. -- accepted -- thinleaved owl's-clover
  Orthocarpus tolmiei Hook. & Arn. -- accepted -- Tolmie's owl's-clover
  Orthocarpus tolmiei ssp. holmgreniorum T.I. Chuang & Heckard -- accepted -- Noel's owl's-clover
  Orthocarpus tolmiei ssp. tolmiei Hook. & Arn. -- accepted -- Tolmie's owl's-clover
  Orthodon dianthera (Buch.-Ham. ex Roxb.) Hand.-Mazz. -- not accepted
  Orthosiphon Benth. -- accepted
  Osmanthus Lour. -- accepted -- devilwood
  Osmanthus americanus (L.) Benth. & Hook. f. ex A. Gray -- accepted -- devilwood
  Osmanthus americanus var. americanus (L.) Benth. & Hook. f. ex A. Gray -- accepted -- American devilwood, devilwood
  Osmanthus americanus var. megacarpus (Small) P.S. Greene -- accepted -- devilwood
  Osmanthus delavayi Franch. -- accepted
  Osmanthus floridanus Chapm. -- not accepted
  Osmanthus fragrans Lour. -- accepted -- sweet osmanthus
  Osmanthus heterophyllus (G. Don) P.S. Green -- accepted -- holly osmanthus
  Osmanthus ilicifolius (Hassk.) Mouill. -- not accepted
  Osmanthus megacarpus (Small) Small ex Little -- not accepted
  Osmanthus sandwicensis (A. Gray) Knobl. -- not accepted
  Osmanthus X fortunei Carrière -- accepted -- Fortune's osmanthus
  Otophylla auriculata (Michx.) Small -- not accepted
  Otophylla densiflora (Benth.) Small -- not accepted
  Pachyptera alliacea (Lam.) A.H. Gentry -- not accepted
  Pachystachys Nees -- accepted
  Pachystachys lutea Nees -- accepted -- lollipop-plant
  Pachystachys riedeliana Nees -- not accepted
  Pachystachys spicata (Ruiz & Pav.) Wassh. -- accepted -- cardinal's-guard
  Pagesia acuminata (Walter) Pennell -- not accepted
  Paragonia Bureau -- accepted
  Paragonia pyramidata (Rich.) Bureau -- accepted
  Parentucellia Viv. -- accepted -- glandweed
  Parentucellia latifolia (L.) Caruel -- accepted -- broadleaf glandweed
  Parentucellia viscosa (L.) Caruel -- accepted -- yellow glandweed
  Parmentiera DC. -- accepted
  Parmentiera aculeata (Kunth) Seem. -- accepted -- cuachilote
  Parmentiera cereifera Seem. -- accepted -- candle tree
  Parmentiera edulis DC. -- not accepted
  Pattersonia caroliniensis J.F. Gmel. -- not accepted
  Paulownia Siebold & Zucc. -- accepted
  Paulownia imperialis Siebold & Zucc. -- not accepted
  Paulownia tomentosa (Thunb.) Steud. -- accepted -- royal paulownia, princess tree
  Paulowniaceae -- accepted
  Pedaliaceae -- accepted -- pedaliums
  Pediculariopsis verticillata (L.) Á. Löve & D. Löve -- not accepted
  Pedicularis L. -- accepted -- lousewort
  Pedicularis albertae Hultén -- not accepted
  Pedicularis albolabiata (Hultén) Kozhevn. -- not accepted
  Pedicularis albomarginata M.E. Jones -- not accepted
  Pedicularis anaticeps Pennell -- not accepted
  Pedicularis angustifolia Benth. -- accepted -- Mogollon Mountain lousewort
  Pedicularis angustissima Greene -- not accepted
  Pedicularis arctica R. Br. -- not accepted
  Pedicularis atrosanguinea Pennell & J.W. Thomp. -- not accepted
  Pedicularis attenuata Benth. -- not accepted
  Pedicularis attolens A. Gray -- not accepted
  Pedicularis attollens A. Gray -- accepted -- little elephantshead
  Pedicularis attollens ssp. attollens A. Gray -- accepted -- little elephantshead
  Pedicularis attollens ssp. protogyna Pennell -- accepted -- little elephantshead
  Pedicularis aurantiaca (E.F. Sprague) Monfils & Prather -- accepted -- Indian warrior
  Pedicularis auriculata Sm. -- not accepted
  Pedicularis bracteosa Benth. -- accepted -- bracted lousewort
  Pedicularis bracteosa ssp. paysoniana (Pennell) W.A. Weber -- not accepted
  Pedicularis bracteosa var. atrosanguinea (Pennell & J.W. Thomp.) Cronquist -- accepted -- bracted lousewort
  Pedicularis bracteosa var. bracteosa Benth. -- accepted -- bracted lousewort
  Pedicularis bracteosa var. canbyi (A. Gray) Cronquist -- accepted -- Canby's lousewort
  Pedicularis bracteosa var. flavida (Pennell) Cronquist -- accepted -- towering lousewort
  Pedicularis bracteosa var. latifolia (Pennell) Cronquist -- accepted -- widepetal lousewort
  Pedicularis bracteosa var. pachyrhiza (Pennell) Cronquist -- accepted -- towering lousewort
  Pedicularis bracteosa var. paysoniana (Pennell) Cronquist -- accepted -- Payson's lousewort
  Pedicularis bracteosa var. siifolia (Rydb.) Cronquist -- accepted -- smoothflower lousewort
  Pedicularis brunnescens A. Heller -- not accepted
  Pedicularis canadensis L. -- accepted -- early lousewort, Canadian lousewort
  Pedicularis canadensis ssp. canadensis L. -- not accepted -- Canadian lousewort
  Pedicularis canadensis ssp. canadensis var. canadensis L. -- not accepted -- Canadian lousewort
  Pedicularis canadensis ssp. canadensis var. dobbsii Fernald -- not accepted -- Canadian lousewort
  Pedicularis canadensis ssp. fluviatilis (A. Heller) W.A. Weber -- not accepted -- Canadian lousewort
  Pedicularis canadensis var. dobbsii Fernald -- not accepted
  Pedicularis canbyi A. Gray -- not accepted
  Pedicularis capitata M.F. Adams -- accepted -- capitate lousewort
  Pedicularis centranthera A. Gray -- accepted -- dwarf lousewort
  Pedicularis centranthera var. exulans M. Peck -- not accepted
  Pedicularis chamissonis Steven -- accepted -- Chamisso's lousewort
  Pedicularis concinna Eastw. ex C.F. Baker -- not accepted
  Pedicularis contorta Benth. -- accepted -- coiled lousewort
  Pedicularis contorta var. contorta Benth. -- accepted -- coiled lousewort
  Pedicularis contorta var. ctenophora (Rydb.) A. Nelson & J.F. Macbr. -- accepted -- coiled lousewort
  Pedicularis contorta var. rubicunda R.N. Reese -- accepted -- coiled lousewort
  Pedicularis crenulata Benth. -- accepted -- meadow lousewort
  Pedicularis ctenophora Rydb. -- not accepted
  Pedicularis cystopteridifolia Rydb. -- accepted -- fernleaved pedicularis
  Pedicularis densiflora Benth. ex Hook. -- accepted -- Indian warrior
  Pedicularis densiflora ssp. aurantiaca E.F. Sprague -- not accepted -- Indian warrior
  Pedicularis densiflora ssp. densiflora Benth. ex Hook. -- not accepted -- Indian warrior
  Pedicularis dudleyi Elmer -- accepted -- Dudley's lousewort
  Pedicularis elata sensu Pursh -- not accepted
  Pedicularis euphrasioides Stephan ex Willd. -- not accepted
  Pedicularis flammea L. -- accepted -- redrattle
  Pedicularis flavida Pennell -- not accepted
  Pedicularis fluviatilis A. Heller -- not accepted
  Pedicularis furbishiae S. Watson -- accepted -- St. Johns River lousewort, Furbish's lousewort, Furbish lousewort
  Pedicularis gladiata Michx. -- not accepted
  Pedicularis grayi A. Nelson -- accepted -- giant lousewort
  Pedicularis groenlandica Retz. -- accepted -- bull elephant's-head, elephanthead lousewort
  Pedicularis groenlandica ssp. groenlandica Retz. -- not accepted
  Pedicularis groenlandica ssp. surrecta (Benth.) Piper -- not accepted -- Greenland lousewort
  Pedicularis groenlandica var. surrecta (Benth.) A. Gray -- not accepted
  Pedicularis hallii Rydb. -- not accepted
  Pedicularis hians Eastw. -- not accepted
  Pedicularis hirsuta L. -- accepted -- hairy lousewort
  Pedicularis howellii A. Gray -- accepted -- Howell lousewort, Howell's lousewort
  Pedicularis kanei Durand -- not accepted -- woolly lousewort
  Pedicularis kanei ssp. kanei Durland -- not accepted
  Pedicularis kanei ssp. yukonensis (A.E. Porsild) Kartesz, ined. -- not accepted
  Pedicularis labradorica Wirsing -- accepted -- Labrador lousewort
  Pedicularis labradorica var. labradorica Wirsing -- not accepted -- Labrador lousewort
  Pedicularis labradorica var. sulphurea Hultén -- not accepted -- Labrador lousewort
  Pedicularis lanata Cham. & Schltdl. -- accepted -- woolly lousewort
  Pedicularis lanata ssp. lanata Cham. & Schltdl. -- not accepted -- woolly lousewort
  Pedicularis lanata ssp. yukonensis A.E. Porsild -- not accepted
  Pedicularis lanceolata Michx. -- accepted -- swamp lousewort
  Pedicularis langsdorffii Fisch. ex Steven -- accepted -- Langsdorf's lousewort
  Pedicularis langsdorffii ssp. arctica (R. Br.) Pennell -- accepted -- arctic lousewort
  Pedicularis langsdorffii ssp. langsdorffii Fisch. ex Steven -- accepted -- Langsdorf's lousewort
  Pedicularis langsdorffii var. arctica (R. Br.) Polunin -- not accepted
  Pedicularis langsdorfii Fisch. ex Steven -- not accepted -- Langsdorf's lousewort
  Pedicularis langsdorfii ssp. arctica (R. Br.) Pennell -- not accepted -- arctic lousewort
  Pedicularis langsdorfii ssp. langsdorfii Fisch. ex Steven -- not accepted -- Langsdorf's lousewort
  Pedicularis langsdorfii var. arctica (R. Br.) Polunin -- not accepted
  Pedicularis lapponica L. -- accepted -- Lapland lousewort
  Pedicularis latifolia Pennell -- not accepted
  Pedicularis lunata Rydb. -- not accepted
  Pedicularis macrodonta Richardson -- accepted -- muskeg lousewort
  Pedicularis melampyroides Rich. -- not accepted
  Pedicularis mogollonica Greene -- not accepted
  Pedicularis montanensis Rydb. -- not accepted
  Pedicularis nelsonii R. Br. -- not accepted
  Pedicularis oederi Vahl ex Hornem. -- accepted -- Oeder's lousewort
  Pedicularis oederi var. albertae (Hultén) B. Boivin -- not accepted
  Pedicularis ornithorhyncha Benth. -- accepted -- ducksbill lousewort
  Pedicularis pachyrhiza Pennell -- not accepted
  Pedicularis pacifica (Hultén) Kozhevn. -- not accepted
  Pedicularis paddoensis Pennell -- not accepted
  Pedicularis pallida Nutt. -- not accepted
  Pedicularis palustris L. -- accepted -- European purple lousewort, swamp-lousewort
  Pedicularis palustris ssp. palustris L. -- accepted -- European purple lousewort, swamp-lousewort
  Pedicularis parryi A. Gray -- accepted -- Parry's cinchweed, Parry's lousewort
  Pedicularis parryi ssp. mogollonica (Greene) G.D. Carr -- accepted -- Mogollon lousewort
  Pedicularis parryi ssp. parryi A. Gray -- accepted -- Parry's lousewort
  Pedicularis parryi ssp. purpurea (Parry) G.D. Carr -- accepted -- Rocky Mountain lousewort
  Pedicularis parryi var. mogollonica (Greene) Dorn -- not accepted
  Pedicularis parryi var. purpurea Parry -- not accepted
  Pedicularis parviflora Sm. -- accepted -- smallflower lousewort
  Pedicularis parviflora ssp. parviflora Sm. -- not accepted -- smallflower lousewort
  Pedicularis parviflora ssp. pennellii (Hultén) Hultén -- not accepted -- Pennell's lousewort
  Pedicularis parviflora var. macrodonta (Richardson) S.L. Welsh -- not accepted
  Pedicularis paysoniana Pennell -- not accepted
  Pedicularis pedicellata Bunge -- not accepted
  Pedicularis pennellii Hultén -- accepted
  Pedicularis pennellii var. insularis (Calder & Roy L. Taylor) B. Boivin -- not accepted
  Pedicularis procera A. Gray -- not accepted -- gray lousewort, giant lousewort
  Pedicularis pulchella Pennell -- accepted -- mountain lousewort
  Pedicularis racemosa Douglas ex Benth. -- accepted -- parrot's-beak, sickletop lousewort
  Pedicularis racemosa ssp. alba Pennell -- accepted -- sickletop lousewort
  Pedicularis racemosa ssp. racemosa Douglas ex Benth. -- accepted -- sickletop lousewort
  Pedicularis racemosa var. alba (Pennell) Cronquist -- not accepted
  Pedicularis rainierensis Pennell & F.A. Warren -- accepted -- Mt. Rainier lousewort
  Pedicularis romanzovii Cham. ex Spreng. -- not accepted
  Pedicularis scopulorum (A. Gray) A. Gray -- not accepted
  Pedicularis semibarbata A. Gray -- accepted -- bearded lousewort, pinewoods lousewort
  Pedicularis semibarbata ssp. charlestonensis (Pennell & Clokey) Clokey -- not accepted
  Pedicularis semibarbata var. charlestonensis Pennell & Clokey -- accepted -- Charleston pinewood lousewort, Charleston lousewort
  Pedicularis semibarbata var. semibarbata A. Gray -- accepted -- pinewoods lousewort
  Pedicularis siifolia Rydb. -- not accepted
  Pedicularis subnuda Benth. -- not accepted
  Pedicularis sudetica Willd. -- accepted -- sudetic lousewort
  Pedicularis sudetica ssp. albolabiata Hultén -- accepted -- sudetic lousewort
  Pedicularis sudetica ssp. arctoeuropaea Hultén -- accepted -- sudetic lousewort
  Pedicularis sudetica ssp. interioides Hultén -- not accepted -- pédiculaire des sudètes sous-espèce à bractées dilatées, sudetic lousewort
  Pedicularis sudetica ssp. interior (Hultén) Hultén -- accepted -- sudetic lousewort
  Pedicularis sudetica ssp. pacifica Hultén -- accepted -- Pacific lousewort
  Pedicularis sudetica ssp. scopulorum (A. Gray) Hultén -- accepted -- sudetic lousewort
  Pedicularis sudetica var. bicolor Walp. -- not accepted
  Pedicularis sudetica var. gymnocephala Trautv. -- not accepted
  Pedicularis sudetica var. pacifica (Hultén) S.L. Welsh -- not accepted
  Pedicularis sudetica var. scopulorum A. Gray -- not accepted
  Pedicularis sylvatica L. -- accepted -- small lousewort, lousewort
  Pedicularis thompsonii Pennell -- not accepted
  Pedicularis versicolor Wahlenb. -- not accepted
  Pedicularis verticillata L. -- accepted -- whorled lousewort
  Pedicularis virginica Poir. -- not accepted
  Pedicularis willdenowii Vved. -- not accepted
  Penstemon Schmidel -- accepted -- penstémons, beardtongue
  Penstemon abietinus Pennell -- accepted -- firleaf beardtongue
  Penstemon absarokensis Evert -- accepted -- Absaroka Range beardtongue, Absaroka beardtongue
  Penstemon acaulis L.O. Williams -- accepted -- stemless beardtongue
  Penstemon acaulis var. yampaensis (Penland) Neese -- not accepted
  Penstemon acuminatus Douglas ex Lindl. -- accepted -- sharpleaf penstemon, sand-dune beardtongue
  Penstemon acuminatus var. acuminatus Douglas ex Lindl. -- accepted -- sharpleaf penstemon
  Penstemon acuminatus var. latebracteatus N.H. Holmgren -- accepted -- sharpleaf penstemon
  Penstemon aggregatus Pennell -- not accepted
  Penstemon alamosensis Pennell & G.T. Nisbet -- accepted -- Los Alamos beardtongue, Alamo beardtongue
  Penstemon albertinus Greene -- accepted -- Alberta beardtongue
  Penstemon albidus Nutt. -- accepted -- white penstemon
  Penstemon albifluvis England -- not accepted
  Penstemon albomarginatus M.E. Jones -- accepted -- whitemargin beardtongue, white margin penstemon, whitemargin penstemon, white-margined penstemon
  Penstemon alluviorum Pennell -- not accepted -- lowland beardtongue
  Penstemon alpinus Torr. -- not accepted
  Penstemon alpinus ssp. brandegeei (Porter) Penland -- not accepted
  Penstemon alpinus ssp. magnus (Pennell) Penland -- not accepted
  Penstemon alpinus var. alpinus Torr. -- not accepted
  Penstemon ambiguus Torr. -- accepted -- gilia penstemon, bush penstemon, gilia beardtongue
  Penstemon ambiguus ssp. laevissimus D.D. Keck -- not accepted
  Penstemon ambiguus var. ambiguus Torr. -- accepted -- gilia penstemon, gilia beardtongue
  Penstemon ambiguus var. laevissimus (D.D. Keck) N.H. Holmgren -- accepted -- pink plains beardtongue, gilia penstemon, pink plains penstemon
  Penstemon ammophilus N.H. Holmgren & L.M. Shultz -- accepted -- sandloving penstemon
  Penstemon anguineus Eastw. -- accepted -- Siskiyou beardtongue
  Penstemon angustifolius Nutt. ex Pursh -- accepted -- broadbeard beardtongue, broad-beard beardtongue, narrowleaf penstemon
  Penstemon angustifolius ssp. caudatus (A. Heller) D.D. Keck -- not accepted
  Penstemon angustifolius ssp. venosus D.D. Keck -- not accepted
  Penstemon angustifolius var. angustifolius Nutt. ex Pursh -- accepted -- broadbeard beardtongue, broad-beard beardtongue
  Penstemon angustifolius var. caudatus (A. Heller) Rydb. -- accepted -- broadbeard beardtongue
  Penstemon angustifolius var. dulcis Neese -- accepted -- broadbeard beardtongue
  Penstemon angustifolius var. venosus (D.D. Keck) N.H. Holmgren -- accepted -- broadbeard beardtongue, broadbeard penstemon
  Penstemon angustifolius var. vernalensis N.H. Holmgren -- accepted -- broadbeard beardtongue
  Penstemon antirrhinoides Benth. -- not accepted
  Penstemon antirrhinoides ssp. microphyllus (A. Gray) D.D. Keck -- not accepted
  Penstemon arenarius Greene -- accepted -- sanddune penstemon, Nevada sanddune beardtongue
  Penstemon arenicola A. Nelson -- accepted -- sand penstemon
  Penstemon aridus Rydb. -- accepted -- stiffleaf penstemon
  Penstemon arkansanus Pennell -- accepted -- Arkansas beardtongue
  Penstemon arkansanus var. pubescens Pennell -- not accepted
  Penstemon assurgens D.D. Keck -- not accepted
  Penstemon attenuatus Douglas ex Lindl. -- accepted -- sulphur penstemon
  Penstemon attenuatus ssp. militaris (Greene) D.D. Keck -- not accepted
  Penstemon attenuatus ssp. palustris (Pennell) D.D. Keck -- not accepted
  Penstemon attenuatus ssp. pseudoprocerus (Rydb.) D.D. Keck -- not accepted
  Penstemon attenuatus var. attenuatus Douglas ex Lindl. -- accepted -- sulphur penstemon
  Penstemon attenuatus var. militaris (Greene) Cronquist -- accepted -- South Idaho penstemon
  Penstemon attenuatus var. palustris (Pennell) Cronquist -- accepted -- sulphur beardtongue
  Penstemon attenuatus var. pseudoprocerus (Rydb.) Cronquist -- accepted -- small penstemon
  Penstemon atwoodii S.L. Welsh -- accepted -- Kaiparowits beardtongue
  Penstemon auriberbis Pennell -- accepted -- Colorado beardtongue
  Penstemon australis Small -- accepted -- Eustis Lake beardtongue
  Penstemon australis ssp. australis Small -- not accepted -- Eustis Lake beardtongue
  Penstemon australis ssp. laxiflorus (Pennell) R.W. Benn. -- not accepted -- Eustis Lake beardtongue
  Penstemon australis var. ameles Crosswh. -- not accepted
  Penstemon azureus Benth. -- accepted -- azure penstemon
  Penstemon azureus ssp. angustissimus (A. Gray) D.D. Keck -- not accepted -- azure penstemon
  Penstemon azureus ssp. azureus Benth. -- not accepted -- azure penstemon
  Penstemon azureus var. angustissimus A. Gray -- accepted -- azure penstemon
  Penstemon azureus var. azureus Benth. -- accepted -- beardtongue
  Penstemon azureus var. parvulus A. Gray -- not accepted -- azure penstemon
  Penstemon baccharifolius Hook. -- accepted -- baccharisleaf beardtongue
  Penstemon barbatus (Cav.) Roth -- accepted -- beardlip penstemon
  Penstemon barbatus ssp. barbatus (Cav.) Roth -- not accepted -- beardlip penstemon
  Penstemon barbatus ssp. torreyi (Benth.) D.D. Keck -- not accepted -- Torrey's penstemon
  Penstemon barbatus ssp. trichander (A. Gray) D.D. Keck -- not accepted -- beardlip penstemon