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Publication: U. S. Fish and Wildlife Service. 1993. Endangered and Threatened Wildlife and Plants; Review of Plant Taxa for Listing as Endangered or Threatened Species. Federal Register, vol. 58, no. 188. 51144-51190.

ITIS records citing this publication
 Kingdom Plantae
  Abies fraseri (Pursh) Poir. -- accepted -- balsam fir, eastern fir, Fraser balsam fir, Fraser fir, southern balsam, southern fir
  Abronia umbellata ssp. acutalata (Standl.) Tillett -- not accepted -- pink sand verbena, rose-purple sand-verbena
  Abronia umbellata ssp. breviflora (Standl.) Munz -- not accepted -- pink sand verbena, pink sand-verbena
  Abutilon parishii S. Watson -- accepted -- Parish's Indian mallow
  Abutilon virginianum Krapov. -- not accepted -- Jost Van Dyke's Indian mallow
  Acacia koaia Hillebr. -- accepted -- Koai'e, koaoha
  Acanthomintha obovata ssp. obovata Jeps. -- accepted -- San Benito thornmint
  Acleisanthes crassifolia A. Gray -- accepted -- Texas trumpets
  Agave delamateri W.C. Hodgs. & L. Slauson -- accepted -- Tonto Basin century plant
  Agave glomeruliflora (Engelm.) A. Berger -- not accepted -- Chisos agave, Chisos Mountain century plant, Maguey del Bravo
  Agave murpheyi F. Gibson -- accepted -- Maguey bandeado, Murphey agave, Murphey's century plant
  Agave parviflora ssp. parviflora Torr. -- accepted -- Santa Cruz striped agave, smallflower century plant
  Agave schottii var. treleasei (Toumey) Kearney & Peebles -- accepted -- Schott agave, Trelease's century plant
  Agave shawii Engelm. -- accepted -- coastal agave, Maguey primavera, Shaw's agave
  Agrimonia incisa Torr. & A. Gray -- accepted -- incised agrimony, incised groovebur
  Aletes humilis J.M. Coult. & Rose -- accepted -- Colorado aletes
  Allium constrictum (Ownbey & Mingrone) P.M. Peterson, Annable & Rieseberg -- accepted -- Grand Coulee onion
  Allium jepsoni (Ownbey & Aase) S. Denison & McNeal -- not accepted -- Jepson's onion
  Allium passeyi N.H. Holmgren & A.H. Holmgren -- accepted -- Passey's onion
  Allium shevockii McNeal -- accepted -- Spanish needle onion
  Allium speculae Ownbey & Aase -- accepted -- Little River Canyon onion
  Allium tribracteatum Torr. -- accepted -- threebract onion
  Amelanchier nantucketensis E.P. Bicknell -- accepted -- Nantucket serviceberry
  Amoreuxia wrightii A. Gray -- accepted -- Wright's yellowshow
  Amorpha georgiana var. confusa Wilbur -- accepted -- Carolina lead-plant, Georgia false indigo
  Amorpha georgiana var. georgiana Wilbur -- accepted -- Georgia false indigo, Georgia lead-plant
  Amorpha ouachitensis Wilbur -- accepted -- Ouachita false indigo
  Amorpha roemeriana Scheele -- accepted -- Roemer's false indigo, Texas amorpha
  Amsinckia vernicosa var. furcata (Suksd.) Hoover -- accepted -- forked fiddleneck, forked green fiddleneck
  Amsonia fugatei S.P. McLaughlin -- accepted -- Kearney's bluestar, San Antonio bluestar
  Amsonia glaberrima Woodson -- not accepted -- smooth blue-star
  Amsonia grandiflora Alexander -- accepted -- Arizona bluestar
  Amsonia ludoviciana Vail -- accepted -- Louisiana blue-star
  Amsonia tabernaemontana var. gattingeri Woodson -- accepted -- eastern bluestar
  Amsonia tharpii Woodson -- accepted -- feltleaf bluestar, Tharp blue-star
  Andrachne arida (Warnock & M.C. Johnst.) G.L. Webster -- not accepted -- Trans-Pecos maidenbush
  Anemone edwardsiana var. petraea Correll -- accepted -- Edge Falls anemone, Edwards Plateau thimbleweed, plateau thimbleweed
  Angelica scabrida Clokey & Mathias ex Clokey -- accepted -- Charleston Mountain angelica
  Anthericum chandleri Greenm. & C.H. Thomp. -- not accepted -- lilia de los llanos
  Antirhea portoricensis (Britton & P. Wilson) Standl. -- not accepted -- Puerto Rico quina, quina
  Antirrhinum ovatum Eastw. -- not accepted -- oval-leaved snapdragon
  Aphanisma blitoides Nutt. ex Moq. -- accepted -- San Diego coastalcreeper
  Aquilegia canadensis var. australis (Small) Munz -- not accepted -- Canadian columbine
  Aquilegia chrysantha var. hinckleyana (Munz) E.J. Lott -- not accepted -- Hinckley's columbine, Hinckley's golden columbine
  Aquilegia laramiensis A. Nelson -- accepted -- Laramie columbine
  Aquilegia longissima A. Gray ex S. Watson -- accepted -- long spur columbine, longspur columbine
  Aquilegia micrantha var. mancosana Eastw. -- not accepted -- Mancos columbine
  Arabis bodiensis Rollins -- not accepted -- Bodie Hills rockcress
  Arabis breweri var. pecuniaria Rollins -- not accepted -- Brewer's rockcress, San Bernardino rockcress
  Arabis falcatoria Rollins -- not accepted -- Grouse Creek rockcress
  Arabis falcifructa Rollins -- not accepted -- Elko rockcress
  Arabis fecunda Rollins -- not accepted -- Mt. Sapphire rockcress, Sapphire Mountain rockcress
  Arabis koehleri var. koehleri Howell -- not accepted -- Koehler's rockcress
  Arabis missouriensis var. deamii (M. Hopkins) M. Hopkins -- not accepted
  Arabis ophira Rollins -- not accepted -- Ophir Pass rockcress, Ophir rockcress
  Arabis parishii S. Watson -- not accepted -- dwarf rockcress, Parish's rockcress
  Arabis pinzliae Rollins -- not accepted -- Boundary Peak rockcress, Pinzl's rockcress
  Arabis serpentinicola Rollins -- not accepted -- Preston Peak rockcress
  Arabis suffrutescens var. horizontalis (Greene) Rollins -- not accepted -- horizontal woody rockcress
  Arabis tiehmii Rollins -- not accepted -- Carson Range rockcress, Tiehm's rockcress
  Arabis vivariensis S.L. Welsh -- not accepted -- Park rockcress
  Arabis williamsii Rollins -- not accepted -- Wind River rockcress
  Arctomecon californica Torr. & Frém. -- accepted -- California bearpoppy
  Arctomecon merriamii Coville -- accepted -- desert bearpoppy, white bear desert-poppy, white bearpoppy
  Arctostaphylos andersonii A. Gray -- accepted -- Santa Cruz manzanita
  Arctostaphylos bakeri ssp. bakeri Eastw. -- accepted -- Baker's manzanita
  Arctostaphylos catalinae P.V. Wells -- accepted -- Santa Catalina Island manzanita
  Arctostaphylos cruzensis Roof -- accepted -- Arroyo de la Cruz manzanita, La Cruz manzanita
  Arctostaphylos densiflora M.S. Baker -- accepted -- Vine Hill manzanita
  Arctostaphylos edmundsii J.T. Howell -- accepted -- Little Sur manzanita
  Arctostaphylos gabrielensis P.V. Wells -- not accepted -- San Gabriel manzanita
  Arctostaphylos glutinosa B. Schreib. -- accepted -- Schreiber's manzanita
  Arctostaphylos hookeri ssp. hearstiorum (Hoover & Roof) P.V. Wells -- accepted -- Hearst's manzanita
  Arctostaphylos hookeri ssp. montana (Eastw.) P.V. Wells -- not accepted -- Mt. Tamalpais manzanita, Tamalpais manzanita
  Arctostaphylos klamathensis S.W. Edwards, Keeler-Wolf & W. Knight -- accepted -- Klamath manzanita
  Arctostaphylos luciana P.V. Wells -- accepted -- Santa Lucia manzanita
  Arctostaphylos montaraensis Roof -- accepted -- Montara manzanita
  Arctostaphylos montereyensis Hoover -- accepted -- Monterey manzanita
  Arctostaphylos nissenana Merriam -- accepted -- Nissenan manzanita
  Arctostaphylos nortensis (P.V. Wells) P.V. Wells -- accepted -- Del Norte manzanita
  Arctostaphylos osoensis P.V. Wells -- accepted -- Oso manzanita
  Arctostaphylos otayensis Wiesl. & B. Schreib. -- accepted -- Otay manzanita
  Arctostaphylos pajaroensis (J.E. Adams ex McMinn) J.E. Adams -- accepted -- Pajaro manzanita
  Arctostaphylos pechoensis (Abrams) Dudley ex Eastw. -- accepted -- Pecho manzanita
  Arctostaphylos pilosula ssp. pilosula Jeps. & Wiesl. -- not accepted -- La Panza manzanita, Santa Margarita manzanita
  Arctostaphylos pumila Nutt. -- accepted -- sand-mat manzanita, sandmat manzanita
  Arctostaphylos refugioensis Gankin -- accepted -- Refugio manzanita
  Arctostaphylos silvicola Jeps. & Wiesl. ex Jeps. -- accepted -- Bonny Doon manzanita
  Arctostaphylos stanfordiana ssp. raichei W. Knight -- accepted -- Raiche's manzanita
  Arctostaphylos tomentosa ssp. daciticola P.V. Wells -- accepted -- dacite manzanita
  Arenaria fontinalis (Short & Peter) Shinners -- not accepted -- water stitchwort
  Arenaria kingii ssp. rosea Maguire -- not accepted -- King's rosy sandwort
  Arenaria livermorensis Correll -- accepted -- Livermore sandwort
  Arenaria macradenia var. kuschei (Eastw.) Maguire -- not accepted -- Forest Camp sandwort
  Argemone arizonica G.B. Ownbey -- accepted -- Arizona prickly poppy, Arizona pricklypoppy
  Argemone munita ssp. robusta G.B. Ownbey -- accepted -- flatbud pricklypoppy, robust prickly-poppy
  Argythamnia aphoroides Müll. Arg. -- not accepted -- Hill Country silverbush
  Armoracia lacustris (A. Gray) Al-Shehbaz & V.M. Bates -- not accepted -- armoracie des étangs, lake-cress
  Asclepias eastwoodiana Barneby -- accepted -- Eastwood's milkweed
  Asclepias prostrata W.H. Blackw. -- accepted -- prostrate milkweed
  Asclepias sanjuanensis K.D. Heil, J.M. Porter & S.L. Welsh -- accepted -- San Juan milkweed, San Juan River milkweed
  Asclepias uncialis Greene -- accepted -- wheel milkweed
  Asclepias viridula Chapm. -- accepted -- southern milkweed
  Asplenium plenum E.P. St. John ex Small -- accepted -- ruffled spleenwort
  Asplenium schizophyllum C. Chr. -- accepted -- fringed spleenwort
  Asplenium X heteroresiliens W.H. Wagner (pro sp.) -- accepted -- resilient spleenwort
  Astilbe crenatiloba (Britton) Small -- not accepted -- Roan Mountain false goat's beard
  Astragalus aequalis Clokey -- accepted -- Clokey's milkvetch
  Astragalus amphioxys var. musimonum (Barneby) Barneby -- accepted -- Crescent milkvetch, Sheep Mountain milkvetch, Sheep Range milkvetch
  Astragalus ampullarius S. Watson -- accepted -- gumbo milk-vetch
  Astragalus anisus M.E. Jones -- accepted -- Gunnison milk-vetch
  Astragalus atratus var. inseptus Barneby -- accepted -- Fairfield milkvetch
  Astragalus barrii Barneby -- accepted -- Barr's milkvetch
  Astragalus brandegei Porter -- not accepted
  Astragalus camptopus Barneby -- accepted -- Bruneau milkvetch
  Astragalus cobrensis var. maguirei Kearney -- accepted -- coppermine milk-vetch, Maguire's milkvetch
  Astragalus collinus var. laurentii (Rydb.) Barneby -- accepted -- Laurent's milkvetch
  Astragalus cremnophylax var. myriorrhaphis Barneby -- accepted -- cliff milk-vetch, sentry milkvetch
  Astragalus cronquistii Barneby -- accepted -- Cronquist milk-vetch, Cronquist's milkvetch
  Astragalus deanei (Rydb.) Barneby -- accepted -- Deane's milk-vetch
  Astragalus deterior (Barneby) Barneby -- accepted -- Cliff Palace milkvetch, cliff-palace milk-vetch
  Astragalus diaphanus var. diurnus (S. Watson) Barneby ex M. Peck -- not accepted
  Astragalus douglasii var. perstrictus (Rydb.) Munz & McBurney -- accepted -- campo milkvetch, Jacumba milk-vetch
  Astragalus drabelliformis Barneby -- accepted -- bastard draba milkvetch
  Astragalus eremiticus var. ampullarioides S.L. Welsh -- not accepted
  Astragalus ertterae Barneby & Shevock -- accepted -- Ertter's milk-vetch, Walker Pass milkvetch
  Astragalus eurylobus (Barneby) Barneby -- accepted -- Needle Mountain milkvetch
  Astragalus funereus M.E. Jones -- accepted -- black woollypod, black wooly-pod, Funeral Mountain milkvetch
  Astragalus geyeri var. triquetrus (A. Gray) M.E. Jones -- accepted -- Geyer milkvetch, Geyer's milkvetch, Muddy River milkvetch, threecorner milkvetch
  Astragalus gilmanii Tidestr. -- accepted -- Gilman's milkvetch
  Astragalus gilviflora var. purpureus Dorn -- not accepted
  Astragalus howellii A. Gray -- accepted -- Howell's milkvetch
  Astragalus jejunus var. articulatus Dorn -- not accepted -- starveling milkvetch
  Astragalus kerrii P.J. Knight & Cully -- accepted -- Kerr's milk-vetch
  Astragalus knightii Barneby -- accepted -- Knight's milkvetch
  Astragalus lentiformis A. Gray -- accepted -- lens pod milkvetch
  Astragalus lentiginosus var. ambiguus Barneby -- accepted -- freckled milkvetch, Peach Springs freckled milkvetch, speckledpod milkvetch
  Astragalus lentiginosus var. antonius Barneby -- accepted -- freckled milkvetch, Mt. San Antonio milkvetch
  Astragalus lentiginosus var. chartaceus M.E. Jones -- not accepted -- broadleaf milkvetch, San Pitch Valley milk-vetch
  Astragalus lentiginosus var. pohlii S.L. Welsh & Barneby -- accepted -- Pohl's milkvetch
  Astragalus lentiginosus var. scorpionis M.E. Jones -- accepted -- scorpion milkvetch
  Astragalus lentiginosus var. sierrae M.E. Jones -- accepted -- Big Bear milk-vetch, Sierra milkvetch
  Astragalus leucolobus S. Watson ex M.E. Jones -- accepted -- Bear Valley milkvetch, Bear Valley wooly-pod, whitepod milkvetch
  Astragalus limnocharis var. limnocharis Barneby -- accepted -- Cedar Breaks milkvetch
  Astragalus limnocharis var. tabulaeus S.L. Welsh -- accepted -- Table Cliff milkvetch
  Astragalus michauxii (Kuntze) F.J. Herm. -- accepted -- sandhill's milk-vetch, sandhills milkvetch
  Astragalus mohavensis var. hemigyrus (Clokey) Barneby -- accepted -- curve-podded Mojave milk-vetch, halfring milkvetch, Mojave milkvetch
  Astragalus mollissimus var. marcidus (Greene ex Rydb.) Barneby -- accepted -- Davis Mountains locoweed, withered wooly milk-vetch, woolly locoweed, woolly milkvetch
  Astragalus molybdenus Barneby -- accepted -- Leadville milkvetch
  Astragalus monoensis var. monoensis Barneby -- not accepted -- Mono milk-vetch
  Astragalus monoensis var. ravenii (Barneby) Isely -- not accepted -- Raven's milk-vetch
  Astragalus neglectus (Torr. & A. Gray) E. Sheld. -- accepted -- Cooper's milk-vetch, Cooper's milkvetch
  Astragalus nutriosensis M.J. Sand. -- accepted -- Apache milkvetch, Nutriosa milk-vetch
  Astragalus oocarpus A. Gray -- accepted -- Descanso milk-vetch, egg-pod milkvetch
  Astragalus oophorus var. lavinii Barneby -- accepted -- Lavin's egg milkvetch, Lavin's milk-vetch
  Astragalus oophorus var. lonchocalyx Barneby -- accepted -- egg milkvetch, pink egg milkvetch
  Astragalus pachypus var. jaegeri Munz & McBurney -- accepted -- Jaeger's bush milk-vetch, Jaeger's milkvetch
  Astragalus paysonii (Rydb.) Barneby -- accepted -- Payson's milkvetch
  Astragalus peckii Piper -- accepted -- Peck's milkvetch
  Astragalus preussii var. cutleri Barneby -- not accepted -- Cutler's milkvetch
  Astragalus proximus (Rydb.) Wooton & Standl. -- accepted -- Aztec milkvetch
  Astragalus pulsiferae var. suksdorfii (Howell) Barneby -- accepted -- Suksdorf's milkvetch
  Astragalus remotus (M.E. Jones) Barneby -- accepted -- Spring Mountain milk-vetch
  Astragalus ripleyi Barneby -- accepted -- Ripley milk-vetch, Ripley's milkvetch
  Astragalus robbinsii var. occidentalis S. Watson -- accepted -- Lamoille Canyon milkvetch, Robbins milk-vetch, western milkvetch
  Astragalus scaphoides (M.E. Jones) Rydb. -- accepted -- bitterroot milkvetch
  Astragalus serpens M.E. Jones -- accepted -- plateau milkvetch
  Astragalus sinuatus Piper -- accepted -- Whited milk-vetch, Whited's milkvetch
  Astragalus solitarius M. Peck -- accepted -- solitary milkvetch, weak milk-vetch
  Astragalus sterilis Barneby -- accepted -- barren milkvetch, Sterile milk-vetch
  Astragalus subcinereus var. basalticus S.L. Welsh -- accepted -- Fremont Junction milkvetch
  Astragalus tegetarioides M.E. Jones -- accepted -- bastard milkvetch
  Astragalus tener var. ferrisae Liston -- not accepted -- Sacramento Valley milk-vetch
  Astragalus tennesseensis A. Gray ex Chapm. -- accepted -- Tennessee milkvetch
  Astragalus tiehmii Barneby -- accepted -- Tiehm's milk-vetch
  Astragalus traskiae Eastw. -- accepted -- Trask's milk-vetch
  Astragalus tyghensis M. Peck -- accepted -- Tygh Valley milkvetch
  Astragalus uncialis Barneby -- accepted -- currant milkvetch
  Astragalus vexilliflexus var. nubilus Barneby -- accepted -- White Clouds milkvetch
  Astragalus webberi A. Gray ex W.H. Brewer & S. Watson -- accepted -- Webber's milk-vetch
  Astragalus wetherillii M.E. Jones -- accepted -- Wetherill milk-vetch, Wetherill's milkvetch
  Astragalus xiphoides (Barneby) Barneby -- accepted -- gladiator milk-vetch
  Astragalus yoder-williamsii Barneby -- accepted -- Osgood Mountains milk-vetch
  Atriplex canescens var. gigantea S.L. Welsh & Stutz -- accepted -- fourwing saltbush
  Atriplex cordulata Jeps. -- accepted -- heartscale
  Atriplex joaquiniana A. Nelson -- not accepted -- San Joaquin saltbush, valley spearscale
  Atriplex pacifica A. Nelson -- accepted -- Davidson's saltbush, south coast saltbush
  Atriplex parishii S. Watson -- accepted -- Parish's saltbush, Parrish's brittlescale
  Atriplex tularensis Coville -- accepted -- Bakersfield saltbush, Tulare saltbush
  Atriplex vallicola Hoover -- not accepted -- Lost Hills saltbush
  Aureolaria patula (Chapm.) Pennell -- accepted -- spreading yellow false foxglove
  Baptisia calycosa var. calycosa Canby -- not accepted -- Florida wild indigo
  Baptisia calycosa var. villosa Canby -- not accepted -- Florida wild indigo, hairy wild indigo
  Baptisia simplicifolia Croom -- accepted -- scareweed
  Batesimalva violacea (Rose) Fryxell -- accepted -- purple gay-mallow, purple gaymallow
  Bensoniella oregona (Abrams & Bacig.) C.V. Morton -- accepted -- bensoniella, Oregon bensoniella
  Berberis nervosa var. mendocinensis Roof -- not accepted -- Hardy Creek barberry
  Betula murrayana B.V. Barnes & Dancik -- accepted -- Murray's birch
  Bobea timonioides (Hook. f.) Hillebr. -- accepted -- `ahakea
  Boerhavia mathisiana F.B. Jones -- not accepted -- Mathis spiderling
  Bonamia ovalifolia (Torr.) Hallier f. -- accepted -- bigpod bonamia, bigpod lady's nightcap
  Botrychium ascendens W.H. Wagner -- accepted -- trianglelobe moonwort, upswept moonwort
  Botrychium crenulatum W.H. Wagner -- accepted -- crenulate moonwort, dainty moonwort, scalloped moonwort
  Botrychium gallicomontanum Farrar & Johnson-Groh -- accepted -- Frenchman's Bluff grapefern, Frenchman's Bluff moonwort, prairie moonwort
  Botrychium mormo W.H. Wagner -- accepted -- little goblin, little goblin moonwort
  Botrychium pallidum W.H. Wagner -- accepted -- botryche pâle, pale botrychium, pale moonwort
  Botrychium paradoxum W.H. Wagner -- accepted -- paradox moonwort, peculiar moonwort
  Botrychium pedunculosum W.H. Wagner -- accepted -- stalked moonwort
  Botrychium pumicola Coville ex Underw. -- accepted -- Crater Lake grape fern, Crater Lake grapefern, pumice moonwort
  Botrychium subbifoliatum Brack. -- accepted -- island grapefern, makou
  Brachionidium ciliolatum Garay -- accepted -- hairy cup orchid
  Brassia caudata (L.) Lindl. -- accepted -- Brassia arańa, cricket orchid
  Brodiaea coronaria ssp. rosea (Greene) T.F.Niehaus -- accepted -- Indian Valley brodiaea
  Brodiaea insignis (Jeps.) T.F. Niehaus -- accepted -- Kaweah brodiaea
  Brodiaea kinkiensis T.F. Niehaus -- accepted -- San Clemente Island brodiaea
  Brodiaea orcuttii (Greene) Baker -- accepted -- Orcutt's brodiaea
  Brongniartia minutifolia S. Watson -- accepted -- little leaf Brongniartia, littleleaf greentwig
  Browallia eludens Van Devender & P.D. Jenkins -- accepted -- bush-violet
  Brunfelsia portoricensis Krug & Urb. -- accepted -- Puerto Rico raintree
  Buckleya distichophylla (Nutt.) Torr. -- accepted -- piratebush
  Bumelia thornei Cronquist -- not accepted
  Byrsonima lucida (Mill.) DC. -- accepted -- Key byrsonima, Long Key locustberry, Maricao cimarron
  Byrsonima spicata (Cav.) DC. -- accepted -- doncella, Maricao cimarron
  Caesalpinia brachycarpa (A. Gray) Fisher -- not accepted -- broad-pod rushpea, broadpod nicker
  Caesalpinia culebrae (Britton & P. Wilson) Alain -- not accepted -- amarillo mato, smooth yellow nicker
  Caesalpinia portoricensis (Britton & P. Wilson) Alain -- not accepted -- brown mato, brown nicker
  Calamintha ashei (Weath.) Shinners -- not accepted -- Ashe's calamint
  Calochortus clavatus ssp. recurvifolius (Hoover) Munz -- not accepted -- Arroyo de la Cruz mariposa lily
  Calochortus clavatus var. gracilis Ownbey -- accepted -- slender mariposa lily
  Calochortus coxii M.R. Godfrey & Callahan -- accepted -- Cox's mariposa lily
  Calochortus dunnii Purdy -- accepted -- Dunn's mariposa lily
  Calochortus excavatus Greene -- accepted -- Inyo County star-tulip, Inyo mariposa lily
  Calochortus indecorus Ownbey & M. Peck -- accepted -- Sexton Mountain mariposa lily
  Calochortus longebarbatus var. longebarbatus S. Watson -- accepted -- long-haired star-tulip, longbeard mariposa lily
  Calochortus longebarbatus var. peckii Ownbey -- accepted -- longbeard mariposa lily, Peck's mariposa
  Calochortus monanthus Ownbey -- accepted -- Shasta River mariposa lily
  Calochortus palmeri var. munzii Ownbey -- accepted -- Munz's mariposa lily
  Calochortus palmeri var. palmeri S. Watson -- accepted -- Palmer's mariposa lily
  Calochortus plummerae Greene -- accepted -- Plummer's mariposa lily
  Calochortus raichei Farwig & V. Girard -- accepted -- Cedars mariposa lily, The Cedars globe-lily
  Calochortus striatus Parish -- accepted -- alkali mariposa lily
  Calochortus weedii var. intermedius Ownbey -- accepted -- foothill mariposa lily, Weed's mariposa lily
  Calochortus weedii var. vestus Purdy -- accepted -- Weed's mariposa lily
  Calyptranthes luquillensis Alain -- accepted -- Luquillo forest lidflower
  Calyptranthes peduncularis Alain -- accepted -- Maricao lidflower
  Calyptranthes triflorum Alain -- not accepted
  Calystegia atriplicifolia ssp. buttensis Brummitt -- accepted -- Butte County morning-glory, nightblooming false bindweed
  Calystegia collina ssp. oxyphylla Brummitt -- accepted -- coast range false bindweed, Mt. Saint Helena morning-glory
  Calystegia collina ssp. venusta Brummitt -- accepted -- coast range false bindweed, South Coast Range morning-glory
  Calystegia macrostegia ssp. amplissima Brummitt -- accepted -- island false bindweed, Island morning-glory
  Calystegia peirsonii (Abrams) Brummitt -- accepted -- Peirson's false bindweed, Peirson's morning-glory
  Calystegia subacaulis ssp. episcopalis Brummitt -- accepted -- Cambria morning-glory, hillside false bindweed
  Camassia howellii S. Watson -- accepted -- Howell's camas
  Camissonia atwoodii Cronquist -- not accepted -- Atwood's evening primrose, Atwood's evening-primrose
  Camissonia confertiflora (P.H. Raven) P.H. Raven -- not accepted -- Grand Canyon suncup
  Camissonia guadalupensis ssp. clementina (P.H. Raven) P.H. Raven -- not accepted -- Clementine suncup, San Clemente Island evening-primrose
  Camissonia hardhamiae P.H. Raven -- not accepted -- Hardham's evening primrose, Hardham's evening-primrose
  Camissonia megalantha (Munz) P.H. Raven -- not accepted -- Cane Spring suncup, largeflower suncup
  Camissonia sierrae ssp. alticola P.H. Raven -- accepted -- Mono Hot Springs evening primrose, Mono Hot Springs evening-primrose
  Camissonia specuicola ssp. hesperia (P.H. Raven) P.H. Raven -- not accepted -- Kaibab suncup
  Campanula californica (Kellogg) A. Heller -- accepted -- swamp bellflower, swamp harebell
  Campanula sharsmithiae Morin -- accepted -- Mt. Hamilton bellflower
  Campanula wilkinsiana Greene -- accepted -- Wilkin's harebell, Wilkins' bellflower
  Capparis sandwichiana DC. -- accepted -- native caper, pus pilo
  Cardamine clematitis Shuttlw. ex A. Gray -- accepted -- mountain bittercress, small mountain bittercress
  Cardamine gemmata Greene -- not accepted -- yellow-tubered toothwort
  Carex aboriginum M.E. Jones -- accepted -- Indian Valley sedge
  Carex baltzellii Chapm. ex Dewey -- accepted -- Baltzell's sedge
  Carex bicknellii var. opaca F.J. Herm. -- not accepted -- Bicknell's sedge
  Carex chapmanii Steud. -- accepted -- Chapman's sedge
  Carex communis var. amplisquama (F.J. Herm.) Rettig -- accepted -- Dixie sedge
  Carex fissa Mack. -- accepted -- hammock sedge
  Carex formosa Dewey -- accepted -- handsome sedge
  Carex haysii S.L. Welsh -- not accepted -- Hays' sedge
  Carex hyalina Boott -- accepted -- tissue sedge
  Carex impressinervia Bryson, Kral & Manhart -- accepted -- ravine sedge
  Carex latebracteata Waterf. -- accepted -- Waterfall's sedge
  Carex lenticularis var. dolia (M.E. Jones) L.A. Standl. -- accepted -- Enander's sedge
  Carex manhartii Bryson -- accepted -- Manhart's sedge
  Carex oronensis Fernald -- accepted -- Orono sedge
  Carex polymorpha Muhl. -- accepted -- variable sedge
  Carex roanensis F.J. Herm. -- accepted -- Roan Mountain sedge
  Carex schweinitzii Dewey ex Schwein. -- accepted -- Schweinitz's sedge
  Carex wahuensis ssp. herbstii T. Koyama -- accepted -- Herbst's sedge
  Cassia fasciculata var. macrosperma Fernald -- not accepted
  Castilleja ambigua ssp. humboldtiensis (D.D. Keck) T.I. Chuang & Heckard -- accepted -- Humboldt Bay owl's clover
  Castilleja chlorotica Piper -- accepted -- green-tinged paintbrush, greentinge Indian paintbrush
  Castilleja ciliata Pennell -- not accepted
  Castilleja cryptantha Pennell & G.N. Jones -- accepted -- obscure Indian paintbrush
  Castilleja fraterna Greenm. -- accepted -- fraternal Indian paintbrush
  Castilleja gleasonii Elmer -- not accepted -- Mount Gleason paintbrush
  Castilleja kaibabensis N.H. Holmgren -- accepted -- Kaibab Indian paintbrush, Kaibab paintbrush, Kaibab Plateau Indian paintbrush
  Castilleja lasiorhyncha (A. Gray) T.I. Chuang & Heckard -- accepted -- San Bernardino Mountains Indian paintbrush, San Bernardino Mountains orthocarpus
  Castilleja leschkeana J.T. Howell -- not accepted -- Point Reyes paintbrush
  Castilleja mendocinensis (Eastw.) Pennell -- accepted -- Mendocino Coast Indian paintbrush, Mendocino coast paintbrush
  Castilleja mogollonica Pennell -- not accepted -- White Mountains paintbrush
  Castilleja parvula Rydb. -- accepted -- Tushar Indian paintbrush, Tushar Plateau Indian paintbrush
  Castilleja pilosa var. steenensis (Pennell) N.H. Holmgren -- accepted -- Steen's mountain paintbrush, Steenes Indian paintbrush
  Castilleja revealii N.H. Holmgren -- accepted -- Bryce Canyon Indian paintbrush
  Castilleja rubida Piper -- accepted -- little reddish Indian paintbrush
  Castilleja uliginosa Eastw. -- not accepted -- Pitkin Marsh paintbrush
  Caulanthus simulans Payson -- accepted -- Payson's jewelflower, Payson's wild cabbage
  Caulanthus stenocarpus Payson -- not accepted -- slender-pod jewelflower
  Caulostramina jaegeri (Rollins) Rollins -- not accepted -- cliffdweller, Jaeger's caulostramina
  Ceanothus arboreus var. glabra Jeps. -- not accepted
  Ceanothus confusus J.T. Howell -- accepted -- Rincon ceanothus, Rincon Ridge ceanothus
  Ceanothus cuneatus var. rigidus (Nutt.) Hoover -- accepted -- Monterey ceanothus
  Ceanothus cyaneus Eastw. -- accepted -- lakeside ceanothus, San Diego buckbrush
  Ceanothus divergens Parry -- accepted -- Calistoga ceanothus
  Ceanothus foliosus var. vineatus McMinn -- accepted -- Vine Hill ceanothus
  Ceanothus gloriosus var. porrectus J.T. Howell -- accepted -- Mount Vision ceanothus, Mt. Vision ceanothus
  Ceanothus hearstiorum Hoover & J.B. Roof -- accepted -- Hearst Ranch buckbrush, Hearst's ceanothus
  Ceanothus maritimus Hoover -- accepted -- maritime California-lilac, maritime ceanothus
  Ceanothus masonii McMinn -- accepted -- Bolinas ceanothus, Mason's ceanothus
  Ceanothus sonomensis J.T. Howell -- accepted -- Sonoma ceanothus
  Ceanothus verrucosus Nutt. -- accepted -- barranca brush, wart-stemmed ceanothus
  Cerastium arvense var. villosissimum Pennell -- not accepted
  Cereus gracilis var. simpsonii (Small ex Britton & Rose) L.D. Benson -- not accepted -- Simpson's prickly-apple
  Cereus greggii var. aboriginum -- not accepted -- aboriginal prickly-apple
  Cereus greggii var. greggii Engelm. -- not accepted -- desert nightblooming cereus
  Chamaerhodos nuttallii var. keweenawensis Fernald -- not accepted
  Chamaesyce arnottiana (Endl.) O. Deg., I. Deg. & Croizat -- not accepted -- `akoko
  Chamaesyce atrococca (A. Heller) Croizat & O. Deg. -- not accepted -- koko
  Chamaesyce celastroides var. tomentella (Boiss.) Koutnik -- not accepted -- `ekoko
  Chamaesyce chaetocalyx var. triligulata (L.C. Wheeler) Mayfield -- not accepted -- bristlecup sandmat, three-tongued spurge
  Chamaesyce cumulicola Small -- not accepted -- coastal dune sandmat
  Chamaesyce golondrina (L.C. Wheeler) Shinners -- not accepted -- boquillas sandmat, swallow spurge
  Chamaesyce olowaluana (Sherff) Croizat & O. Deg. -- not accepted -- alpine sandmat
  Chamaesyce platysperma (Engelm. ex S. Watson) Shinners -- not accepted -- flat-seed sandmat, flat-seeded spurge, flatseed sandmat
  Chamaesyce porteriana var. keyensis (Small) D.G. Burch -- not accepted
  Chamaesyce porteriana var. porteriana Small -- not accepted -- Porter's sandmat
  Chamaesyce porteriana var. scoparia (Small) D.G. Burch -- not accepted -- Porter's sandmat
  Chamaesyce skottsbergii var. vaccinioides (Sherff) Koutnik -- not accepted -- coastal sandmat
  Chamaesyce sparsiflora (A. Heller) Koutnik -- not accepted -- Wahiawa bog sandmat
  Chenopodium cycloides A. Nelson -- accepted -- Sandhill goosefoot
  Chlorogalum grandiflorum Hoover -- accepted -- Red Hills soap plant, Red Hills soaproot
  Choisya mollis Standl. -- not accepted -- Santa Cruz star leaf
  Chorizanthe biloba var. immemora Reveal & Hardham -- accepted -- San Benito spineflower, twolobe spineflower
  Chorizanthe cuspidata var. cuspidata S. Watson -- accepted -- San Francisco Bay spineflower, San Francisco spineflower
  Chorizanthe parryi var. parryi S. Watson -- accepted -- Parry's spineflower, San Bernardino spineflower
  Chorizanthe polygonoides ssp. longispina (Goodman) Munz -- not accepted
  Chorizanthe rectispina Goodman -- accepted -- one-awned spineflower, prickly spineflower
  Chrysophyllum eggersii Pierre -- not accepted
  Chrysosplenium iowense Rydb. -- accepted -- Iowa golden saxifrage
  Cimicifuga elata Nutt. -- not accepted -- tall bugbane
  Cimicifuga rubifolia Kearney -- not accepted -- Appalachian bugbane
  Clarkia borealis ssp. arida E. Small -- accepted -- arid northern clarkia, Shasta clarkia
  Clarkia concinna ssp. automixa R.N. Bowman -- accepted -- East Bay clarkia, red ribbons
  Clarkia concinna ssp. raichei G.A. Allen, V.S. Ford & Gottlieb -- accepted -- Raiche's clarkia, Tomales clarkia
  Clarkia mosquinii ssp. mosquinii E. Small -- not accepted -- Mosquin's clarkia, Mosquin's fairyfan
  Clarkia mosquinii ssp. xerophila E. Small -- not accepted -- Enterprise clarkia
  Clarkia rostrata W.S. Davis -- accepted -- beaked clarkia
  Claytonia lanceolata var. flava (A. Nelson) C.L. Hitchc. -- not accepted -- lanceleaf springbeauty
  Claytonia virginica var. hammondiae (Kalmb.) Doyle, W.H. Lewis & D.B. Snyder -- not accepted -- Hammond's claytonia
  Clematis viticaulis E.S. Steele -- accepted -- Millboro leather flower, Millboro leatherflower
  Cleome multicaulis DC. -- not accepted -- slender spiderflower
  Collinsia antonina Hardham -- not accepted
  Collomia mazama Coville -- accepted -- Crater Lake collomia, Mt. Mazama collomia
  Collomia renacta E. Joyal -- accepted -- Barren Valley collomia
  Colubrina stricta Engelm. ex M.C. Johnst. -- accepted -- Comal nakedwood, Comal snakewood
  Comarostaphylis diversifolia ssp. diversifolia (Parry) Greene -- accepted -- summer holly, summer-holly
  Condalia hookeri var. edwardsiana (Cory) M.C. Johnst. -- accepted -- bluewood condalia, Edwards' bluewood, Edwards' brasil
  Conioselinum mexicanum J.M. Coult. & Rose -- accepted -- Mexican hemlock-parsley, Mexican hemlockparsley
  Conostegia hotteana Urb. & Ekman -- not accepted
  Cordia wagnerorum R.A. Howard -- not accepted -- Luquillo Mountain manjack
  Cordylanthus maritimus ssp. palustris (Behr) T.I. Chuang & Heckard -- not accepted -- northcoast bird's-beak, Pt. Reyes bird's-beak
  Cordylanthus mollis ssp. hispidus (Pennell) T.I. Chuang & Heckard -- not accepted -- hispid bird's-beak
  Cordylanthus orcuttianus A. Gray -- not accepted -- Orcutt's bird's-beak
  Cordylanthus tecopensis Munz & J.C. Roos -- not accepted -- Tecopa bird's beak, Tecopa bird's-beak
  Cordylanthus tenuis ssp. barbatus T.I. Chuang & Heckard -- accepted -- Fresno County bird's-beak
  Cordylanthus tenuis ssp. pallescens (Pennell) T.I. Chuang & Heckard -- accepted -- pallid bird's-beak
  Corydalis aquae-gelidae M. Peck & W.C. Wilson -- accepted -- coldwater fumewort
  Coryphantha albicolumnaria (Hester) Zimmerman -- not accepted -- white column cory cactus
  Coryphantha chaffeyi (Britton & Rose) Fosberg -- not accepted -- Chaffey's cory cactus
  Coryphantha dasyacantha var. dasyacantha (Engelm.) Orcutt -- not accepted
  Coryphantha duncanii (Hester) L.D. Benson -- not accepted -- Duncan's cory cactus
  Coryphantha hesteri Y. Wright -- not accepted -- Hester's cory cactus
  Coryphantha sulcata var. nickelsiae (K. Brandegee) L.D. Benson -- not accepted -- Nickels' cory cactus
  Coryphantha vivipara var. alversonii (J.M. Coult.) L.D. Benson -- not accepted -- Alverson's foxtail cactus
  Coursetia glabella (A. Gray) Lavin -- accepted -- smooth babybonnets, smooth coursetia
  Crataegus harbisonii Beadle -- accepted -- Harbison's hawthorn
  Crataegus triflora Chapm. -- accepted -- threeflower hawthorn
  Crataegus warneri Sarg. -- not accepted -- Warner hawthorn, Warner's hawthorn
  Croomia pauciflora (Nutt.) Torr. -- accepted -- croomia
  Croton alabamensis var. alabamensis E.A. Sm. ex Chapm. -- accepted -- Alabama croton
  Croton fishlockii Britton -- accepted -- Fishlock's croton
  Cryptantha aperta (Eastw.) Payson -- accepted -- Grand Junction catseye, Grand Junction cryptantha
  Cryptantha cinerea var. arenicola Higgins & S.L. Welsh -- accepted -- James' catseye, James' cryptantha
  Cryptantha compacta Higgins -- accepted -- compact cryptantha
  Cryptantha creutzfeldtii S.L. Welsh -- accepted -- Creutzfeldt's cryptantha
  Cryptantha crinita Greene -- accepted -- Sacramento cryptantha, silky cryptantha
  Cryptantha ganderi I.M. Johnst. -- accepted -- Gander's cryptantha
  Cryptantha hoffmannii I.M. Johnst. -- accepted -- Hoffmann's cryptantha
  Cryptantha insolita (J.F. Macbr.) Payson -- accepted -- Las Vegas cryptantha
  Cryptantha ochroleuca Higgins -- accepted -- yellow-white catseye, yellowwhite cryptantha
  Cryptantha rollinsii I.M. Johnst. -- accepted -- Rollins' cryptantha
  Cryptantha roosiorum Munz -- accepted -- bristlecone catseye, bristlecone cryptantha
  Cryptantha schoolcraftii Tiehm -- not accepted -- Schoolcraft's cryptantha
  Cryptantha shackletteana Higgins -- accepted -- Shacklette's cryptantha
  Cryptantha subcapitata Dorn & Lichvar -- accepted -- Wallowa cryptantha
  Cryptantha welshii Thorne & Higgins -- accepted -- Welsh's cryptantha, White River cryptantha
  Cuphea aspera Chapm. -- accepted -- tropical waxweed
  Cupressus forbesii Jeps. -- not accepted -- ciprés negro, Forbes cypress, Tecate cypress
  Cupressus goveniana ssp. pygmaea (Lemmon) Bartel -- not accepted -- Mendocino cypress, pygmy cypress
  Cupressus macrocarpa Hartw. ex Gordon -- not accepted -- ciprés Monterrey, Monterey cypress
  Cuscuta attenuata Waterf. -- not accepted -- dodder, slender dodder, tapertip dodder
  Cuscuta harperi Small -- accepted -- Harper's dodder
  Cuscuta warneri Yunck. -- accepted -- Warner's dodder
  Cusickiella quadricostata (Rollins) Rollins -- accepted -- Bodie Hills cusickiella, Bodie Hills draba, Bodie Hills false whitlowgrass
  Cyanea leptostegia A. Gray -- accepted -- giant koke'e cyanea, giant kokee cyanea
  Cyanea longissima (Rock) H. St. John -- accepted -- haha, streambank cyanea
  Cyanea marksii Rock -- accepted -- Marks' cyanea
  Cymopterus acaulis var. higginsii (S.L. Welsh) Goodrich -- not accepted -- Higgins biscuitroot, Higgins' springparsley
  Cymopterus beckii S.L. Welsh & Goodrich -- accepted -- featherleaf springparsley
  Cymopterus davisii R.L. Hartm. -- accepted -- Davis' springparsley
  Cymopterus douglassii R.L. Hartm. & Constance -- accepted -- Douglass' springparsley
  Cymopterus everetii R.L. Hartm. & R.S. Kirkp. -- not accepted
  Cymopterus goodrichii S.L. Welsh & Neese -- accepted -- Goodrich's springparsley, Toiyabe springparsley
  Cymopterus megacephalus M.E. Jones -- accepted -- large-leaf spring parsley, largeleaf springparsley
  Cymopterus minimus (Mathias) Mathias -- accepted -- Cedar Breaks biscuitroot, Cedar Breaks springparsley
  Cymopterus ripleyi var. saniculoides Barneby -- not accepted
  Cynanchum wigginsii Shinners -- not accepted -- Wiggins' swallow-wort, Wiggins' swallowwort
  Cyperus cephalanthus Torr. & Hook. -- accepted -- buttonbush flatsedge
  Cyperus grayoides Mohlenbr. -- accepted -- Illinois flatsedge, umbrella sedge
  Cyperus louisianensis Thieret -- not accepted -- Louisiana flatsedge
  Cyperus onerosus M.C. Johnst. -- accepted -- flat dune sedge, plains flatsedge
  Cypripedium kentuckiense C.F. Reed -- accepted -- Kentucky lady's slipper, southern lady's slipper
  Cyrtandra biserrata H. St. John -- not accepted
  Cyrtandra halawensis Rock -- accepted -- toothleaf cyrtandra
  Cyrtandra hematos H. St. John -- accepted -- singleflower cyrtandra
  Cyrtandra kealiae Wawra -- accepted -- Wahiawa Mountain cyrtandra
  Cyrtandra lydgatei Hillebr. -- accepted -- Lydgate's cyrtandra
  Cyrtandra macrocalyx Hillebr. -- accepted -- largecalyx cyrtandra
  Cyrtandra pickeringii A. Gray -- accepted -- Pickering's cyrtandra
  Cyrtandra pruinosa H. St. John & Storey -- accepted -- frosted cyrtandra
  Cyrtandra sandwicensis (H. Lév.) H. St. John & Storey -- accepted -- hairy cyrtandra
  Dalea bartonii Barneby -- accepted -- Cox's dalea, Warnock's prairie clover, Warnock's prairieclover
  Dalea flavescens var. epica (S.L. Welsh) Chatterley -- not accepted -- Hole-In-The-Rock prairie-clover
  Dalea reverchonii (S. Watson) Shinners -- accepted -- Comanche Peak prairie clover, Comanche-peak prairie-clover
  Dalea sabinalis (S. Watson) Shinners -- accepted -- Sabinal prairie-clover
  Dedeckera eurekensis Reveal & J.T. Howell -- accepted -- July gold
  Delphinium californicum ssp. interius (Eastw.) Ewan -- accepted -- California larkspur, Hospital Canyon larkspur
  Delphinium exaltatum Aiton -- accepted -- tall larkspur
  Delphinium hesperium ssp. cuyamacae (Abrams) F.H. Lewis & Epling -- accepted -- Cuyamaca larkspur, foothill larkspur
  Delphinium hutchinsoniae Ewan -- accepted -- Hutchinson's delphinium, Monterey larkspur
  Delphinium leucophaeum Greene -- not accepted
  Delphinium parryi ssp. blochmaniae (Greene) F.H. Lewis & Epling -- accepted -- Blochman's larkspur, dune larkspur
  Delphinium recurvatum Greene -- accepted -- Byron larkspur, recurved larkspur
  Dendromecon rigida ssp. harfordii (Kellogg) P.H. Raven -- not accepted -- Channel Island tree poppy
  Dendromecon rigida ssp. rhamnoides (Greene) Thorne -- not accepted -- island tree poppy, tree poppy
  Dendropemon sintenisii Krug & Urb. -- not accepted -- hicaquillo
  Descurainia torulosa Rollins -- accepted -- Wind River tansymustard
  Desmanthus bicornutus S. Watson -- accepted -- ruby bundleflower, two-horn bundleflower
  Desmodium humifusum (Muhl. ex Bigelow) Beck -- accepted -- eastern trailing ticktrefoil, ground-spreading tick-trefoil
  Desmodium lindheimeri Vail -- accepted -- Lindheimer's tickseed, Lindheimer's ticktrefoil
  Dicerandra radfordiana Huck -- accepted -- Radford's balm
  Dicliptera krugii Urb. -- accepted -- Krug's foldwing
  Dionaea muscipula J. Ellis -- accepted -- Venus fly trap, Venus flytrap
  Ditaxis californica (Brandegee) A. Heller -- not accepted -- California ditaxis
  Dodecatheon austrofrigidum K.L. Chambers -- not accepted -- tundra shootingstar
  Dodecatheon frenchii (Vasey) Rydb. -- not accepted -- French's shootingstar
  Douglasia idahoensis Douglass M. Hend. -- not accepted -- Idaho dwarf-primrose
  Draba arida C.L. Hitchc. -- accepted -- desert draba
  Draba asterophora var. macrocarpa C.L. Hitchc. -- not accepted -- Cup Lake draba, Lake Tahoe draba
  Draba carnosula O.E. Schulz -- accepted -- Mount Eddy draba
  Draba crassifolia var. nevadensis C.L. Hitchc. -- not accepted -- dolomite draba
  Draba jaegeri Munz & I.M. Johnst. -- accepted -- Jaeger's draba
  Draba kassii S.L. Welsh -- accepted -- Kass' draba
  Draba murrayi G.A. Mulligan -- accepted -- Kathul Mountain draba
  Draba nivalis var. brevicula Rollins -- not accepted -- little snow draba
  Draba oreibata var. serpentina Tiehm & P.K. Holmgren -- not accepted -- serpentine draba, Snake Range draba
  Draba paucifructa Clokey & C.L. Hitchc. -- accepted -- Charleston draba, Charleston Mountain draba
  Draba pectinipila Rollins -- accepted
  Draba smithii Gilg ex O.E. Schulz -- accepted -- Smith's draba
  Draba sobolifera Rydb. -- accepted -- stolon draba, stolon whitlowgrass
  Draba standleyi J.F. Macbr. & Payson -- accepted -- Standley's draba, Standley's whitlowgrass
  Draba yukonensis A.E. Porsild -- accepted -- Yukon whitlowgrass
  Dudleya abramsii ssp. affinis K.M. Nakai -- accepted -- San Bernardino Mountains dudleya, San Bernardino Mountains liveforever
  Dudleya abramsii ssp. bettinae (Hoover) Bartel -- accepted -- San Luis Obispo serpentine dudleya, San Luis serpentine dudleya
  Dudleya attentuata ssp. orcuttii (Rose) Moran -- not accepted -- Orcutt's dudleya
  Dudleya blochmaniae ssp. blochmaniae (Eastw.) Moran -- accepted -- Blochman's liveforever, short-leaved dudleya
  Dudleya candelabrum Rose -- accepted -- candleholder dudleya, candleholder liveforever
  Dudleya cymosa ssp. crebrifolia K.M. Nakai & Verity -- accepted -- San Gabriel River dudleya
  Dudleya multicaulis (Rose) Moran -- accepted -- many-stemmed liveforever, manystem liveforever
  Dudleya saxosa ssp. saxosa (M.E. Jones) Britton & Rose -- accepted -- Panamint dudleya, Panamint liveforever
  Dudleya variegata (S. Watson) Moran -- accepted -- variegated dudleya, variegated liveforever
  Dudleya virens (Rose) Moran -- accepted -- bright green dudleya, green liveforever
  Echinocereus chloranthus var. neocapillus D. Weniger -- not accepted -- brownspine hedgehog cactus, golden-spined hedgehog cactus
  Echinocereus engelmannii var. howei L.D. Benson -- not accepted -- Howe's cactus, Howe's hedgehog cactus
  Echinocereus engelmannii var. munzii (Parish) W. Pierce & Fosberg -- not accepted -- Munz's hedgehog cactus
  Echinocereus papillosus var. angusticeps (Clover) W.T. Marshall -- not accepted -- Allicoche hedgehog cactus, small papillosus
  Echinocereus reichenbachii var. fitchii (Britton & Rose) L.D. Benson -- not accepted -- Fitch's hedgehog cactus
  Echinodorus parvulus Engelm. -- not accepted -- mudbabies
  Echinomastus erectocentrus var. erectocentrus (J.M. Coult.) Britton & Rose -- not accepted
  Eleocharis brachycarpa Svenson -- accepted -- short-fruited spikerush, shortfruit spikerush
  Eleocharis cylindrica Buckley -- accepted -- cylinder spikerush
  Eleocharis wolfii (A. Gray) A. Gray ex Britton -- accepted -- wolf's spike-rush, Wolf's spikerush
  Elodea linearis (Rydb.) H. St. John -- not accepted -- Nashville waterweed
  Elodea schweinitzii (Planch.) Casp. -- not accepted -- Schweinitz's waterweed
  Elytraria caroliniensis var. angustifolia (Fernald) S.F. Blake -- accepted -- Carolina scalystem
  Encyclia boothiana var. erythronioides (Small) Luer -- not accepted -- dollar orchid
  Encyclia kranzlinii (Bello) Ackerman -- not accepted
  Epilobium nevadense Munz -- accepted -- Nevada willowherb, Nevada willowweed
  Epilobium oreganum Greene -- accepted -- Grants Pass willowherb, Oregon fireweed
  Epithelantha bokei L.D. Benson -- accepted -- Biznaga-blanca de Boquillas, Boke's button cactus
  Eriastrum brandegeae H. Mason -- not accepted -- Brandegee eriastrum
  Eriocaulon koernickianum Van Heurck & Müll. Arg. -- accepted -- Gulf pipewort, small-headed pipewort, smallhead pipiwort
  Eriogonum aliquantum Reveal -- accepted -- Cimarron buckwheat, Cimarron wild-buckwheat
  Eriogonum alpinum Engelm. -- accepted -- Trinity buckwheat
  Eriogonum ammophilum Reveal -- accepted -- ibex buckwheat, sand-loving wild-buckwheat
  Eriogonum ampullaceum J.T. Howell -- accepted -- Mono buckwheat
  Eriogonum anemophilum Greene -- accepted -- west Humboldt buckwheat, windloving buckwheat
  Eriogonum apachense Reveal -- not accepted -- Apache buckwheat, Apache wild-buckwheat
  Eriogonum aretioides Barneby -- accepted -- Red Canyon buckwheat, Widstoe wild-buckwheat
  Eriogonum bifurcatum Reveal -- accepted -- forked buckwheat, Pahrump buckwheat, Pahrump Valley buckwheat
  Eriogonum butterworthianum J.T. Howell -- accepted -- Butterworth's buckwheat
  Eriogonum capillare Small -- accepted -- San Carlos buckwheat, San Carlos wild-buckwheat
  Eriogonum crocatum Davidson -- accepted -- Conejo buckwheat
  Eriogonum cronquistii Reveal -- accepted -- Bull Mountain buckwheat, Cronquist wild-buckwheat
  Eriogonum crosbyae Reveal -- accepted -- Crosby's buckwheat
  Eriogonum cusickii M.E. Jones -- accepted -- Cusick's buckwheat
  Eriogonum eremicola J.T. Howell & Reveal -- accepted -- Telescope Peak buckwheat, Wild Rose Canyon buckwheat
  Eriogonum flavum var. aquilinum Reveal -- accepted -- alpine golden buckwheat
  Eriogonum giganteum var. compactum Dunkle -- accepted -- Santa Barbara Island buckwheat
  Eriogonum giganteum var. formosum Brandegee -- accepted -- San Clemente Island buckwheat
  Eriogonum grande var. rubescens (Greene) Munz -- accepted -- large red buckwheat, redflower buckwheat
  Eriogonum grande var. timorum Reveal -- accepted -- San Nicolas Island buckwheat
  Eriogonum holmgrenii Reveal -- accepted -- Holmgren's buckwheat, Snake Range buckwheat
  Eriogonum intrafractum Coville & Morton -- accepted -- joined buckwheat, napkinring
  Eriogonum kennedyi var. pinicola Reveal -- accepted -- Cache Peak buckwheat, Kern buckwheat
  Eriogonum lagopus Rydb. -- not accepted -- parasol buckwheat
  Eriogonum lewisii Reveal -- not accepted -- Lewis' buckwheat
  Eriogonum lobbii var. robustum (Greene) M.E. Jones -- not accepted -- granite buckwheat
  Eriogonum longifolium var. harperi (Goodman) Reveal -- accepted -- Harper's buckwheat
  Eriogonum meledonum Reveal -- not accepted -- bridle buckwheat
  Eriogonum microthecum var. johnstonii Reveal -- accepted -- Johnston's buckwheat
  Eriogonum microthecum var. panamintense S. Stokes -- accepted -- Panamint buckwheat, Panamint Mountains buckwheat
  Eriogonum mortonianum Reveal -- accepted -- Fredonia buckwheat, Fredonia wild-buckwheat
  Eriogonum nervulosum (S. Stokes) Reveal -- accepted -- Snow Mountain buckwheat
  Eriogonum nudum var. murinum Reveal -- accepted -- mouse buckwheat
  Eriogonum prociduum Reveal -- accepted -- prostrate buckwheat
  Eriogonum ripleyi J.T. Howell -- accepted -- Fraziers Well buckwheat, Ripley wild-buckwheat
  Eriogonum smithii Reveal -- accepted -- flat-top buckwheat, Smith wild-buckwheat
  Eriogonum suffruticosum S. Watson -- accepted -- bushy buckwheat, bushy wild-buckwheat
  Eriogonum temblorense J.T. Howell & Twisselm. -- accepted -- Temblor buckwheat
  Eriogonum thompsonae var. atwoodii Reveal -- not accepted -- Atwood's Thompson wild-buckwheat
  Eriogonum tiehmii Reveal -- accepted -- Tiehm's buckwheat
  Eriogonum truncatum Torr. & A. Gray -- accepted -- Contra Costa buckwheat, Mt. Diablo buckwheat
  Eriogonum twisselmannii (J.T. Howell) Reveal -- accepted -- Twisselmann's buckwheat
  Eriogonum umbellatum var. torreyanum (A. Gray) M.E. Jones -- accepted -- Donner Pass buckwheat
  Eriogonum viscidulum J.T. Howell -- accepted -- clammy buckwheat, sticky buckwheat
  Eriogonum visheri A. Nelson -- accepted -- Visher's buckwheat, Visher's wild buckwheat
  Erithalis revoluta Urb. -- not accepted
  Eryngium pinnatisectum Jeps. -- accepted -- Tuolumne coyote-thistle, Tuolumne eryngo
  Eryngium racemosum Jeps. -- accepted -- Delta coyote-thistle, Delta eryngo
  Eryngium spinosepalum Mathias -- accepted -- spinysepal eryngo, spinysepaled eryngo
  Erysimum ammophilum A. Heller -- accepted -- coast wallflower, San Francisco wallflower
  Erysimum franciscanum Rossbach -- accepted -- San Francisco wallflower
  Erysimum insulare ssp. insulare Greene -- not accepted -- island wallflower
  Erythronium citrinum var. roderickii Shevock & G.A. Allen -- not accepted -- lemon colored fawn-lily, Roderick's fawnlily
  Erythronium elegans P.C. Hammond & K.L. Chambers -- accepted -- Coast Range fawnlily
  Erythronium grandiflorum var. nudipetalum (Applegate) C.L. Hitchc. -- not accepted
  Erythronium tuolumnense Applegate -- accepted -- Tuolumne fawn-lily, Tuolumne fawnlily
  Eschscholzia multiflora ssp. twisselmannii C. Clarke -- not accepted
  Eschscholzia procera Greene -- not accepted -- Kernville goldenpoppy, Kernville poppy
  Eschscholzia rhombipetala Greene -- accepted -- diamond-petaled poppy, diamondpetal California poppy
  Escobaria guadalupensis S. Brack & K.D. Heil -- not accepted -- Guadalupe Mountain foxtail cactus, Guadalupe pincushion cactus
  Escobaria villardii Castetter, P. Pierce & K.H. Schwer. -- not accepted -- Sacramento Mountain foxtail cactus, Villard's pincushion cactus
  Eugenia bellonis Krug & Urb. -- accepted -- Puerto Rico stopper
  Eugenia margarettae Alain -- not accepted
  Eugenia underwoodii Britton -- accepted -- Underwood's stopper
  Euphorbia plummerae S. Watson -- not accepted
  Euphorbia purpurea (Raf.) Fernald -- accepted -- Darlington's glade spurge, Darlington's spurge
  Eurya sandwicensis A. Gray -- accepted -- anini
  Exocarpos gaudichaudii A. DC. -- accepted -- hulumoa
  Exocarpos luteolus C.N. Forbes -- accepted -- heau, leafy ballart
  Ferocactus viridescens (Torr. & A. Gray) Britton & Rose -- accepted -- Biznaga-barril verdosa, coast barrel cactus, San Diego barrel cactus
  Filipendula occidentalis (S. Watson) Howell -- accepted -- queen of the forest, queen-of-the-forest
  Fimbristylis hawaiiensis Hillebr. -- accepted -- Hawai'i fimbry
  Fimbristylis perpusilla R.M. Harper ex Small & Britton -- accepted -- Harper's fimbry
  Forchhammeria polyandra (Griseb.) Alain -- accepted -- manystamen forchhammeria
  Forestiera segregata var. pinetorum (Small) M.C. Johnst. -- accepted -- Florida swampprivet
  Frasera coloradensis (C.M. Rogers) D.M. Post -- accepted -- Colorado frasera
  Frasera gypsicola (Barneby) D.M. Post -- accepted -- Sunnyside elkweed, Sunnyside frasera
  Frasera pahutensis Reveal -- not accepted
  Frasera umpquaensis M. Peck & Applegate -- not accepted -- Umpqua green-gentian
  Fritillaria eastwoodiae R.M. Macfarl. -- accepted -- Butte County fritillary, Butte fritillary
  Fritillaria falcata (Jeps.) D.E. Beetle -- accepted -- talus fritillary
  Fritillaria grayana Rchb. f. & Baker -- not accepted -- Gray's fritillary
  Fritillaria liliacea Lindl. -- accepted -- fragrant fritillary
  Fritillaria ojaiensis Davidson -- accepted -- Ojai fritillary
  Fritillaria pluriflora Torr. ex Benth. -- accepted -- adobe lily, adobe-lily
  Fritillaria viridea Kellogg -- accepted -- San Benito fritillary
  Fryxellia pygmaea (Correll) D.M. Bates -- accepted -- small fryxell wort, small fryxellwort
  Galactia eggersii Urb. -- accepted -- Eggers' milkpea
  Galactia pinetorum Small -- accepted -- pineland milkpea
  Galium angustifolium ssp. borregoense Dempster & Stebbins -- accepted -- Borrego bedstraw
  Galium californicum ssp. luciense Dempster & Stebbins -- accepted -- Cone Peak bedstraw
  Galium californicum ssp. primum Dempster & Stebbins -- accepted -- California bedstraw, San Jacinto bedstraw
  Galium catalinense ssp. acrispum Dempster -- accepted -- Santa Clemente Island bedstraw
  Galium correllii Dempster -- accepted -- cliff bedstraw
  Galium grande McClatchie -- accepted -- San Gabriel bedstraw
  Galium hilendiae ssp. kingstonense (Dempster) Dempster & Ehrend. -- accepted -- Kingston bedstraw, Kingston Mountains bedstraw
  Galvezia speciosa (Nutt.) A. Gray -- not accepted -- island snapdragon
  Genistidium dumosum I.M. Johnst. -- accepted -- brushpea, bush-pea
  Gentiana pennelliana Fernald -- accepted -- wiregrass gentian
  Gentiana plurisetosa C.T. Mason -- accepted -- bristly gentian, Klamath gentian
  Gentiana setigera A. Gray -- accepted -- Mendocino gentian
  Gentianella wislizenii (Engelm.) J.M. Gillett -- not accepted
  Geum geniculatum Michx. -- accepted -- bent avens
  Gilia formosa Greene ex Brand -- not accepted -- Aztec gilia, beautiful gilia
  Githopsis diffusa ssp. filicaulis (Ewan) Morin -- accepted -- Mission Canyon bluecup, San Gabriel bluecup
  Glossopetalon pungens var. glabra (Ensign) H. St. John -- not accepted -- smooth pungent forsellesia
  Graffenrieda ottoschulzii (Urb. & Ekman) Urb. & Ekman -- accepted -- Petites Graines camasey
  Grammitis nimbata (Jenman) Proctor -- accepted -- dwarf polypody, West Indian dwarf polypody
  Graptopetalum bartramii Rose -- accepted -- Patagonia leather petal, Patagonia Mountain leatherpetal
  Gymnocarpium appalachianum Pryer & Haufler -- accepted -- Appalachian oakfern
  Habenaria zothecina L.C. Higgins & S.L. Welsh -- not accepted
  Hackelia brevicula (Jeps.) J.L. Gentry -- accepted -- Poison Canyon stickseed
  Hackelia gracilenta (Eastw.) I.M. Johnst. -- accepted -- Mesa Verde stickseed
  Hackelia ibapensis L.M. Shultz & J.S. Shultz -- accepted -- Ibapah tickweed
  Harpagonella palmeri var. palmeri A. Gray -- accepted -- Palmer's grapplinghook
  Hastingsia atropurpurea Becking -- accepted -- purple rushlily
  Hedeoma graveolens Chapm. ex A. Gray -- not accepted -- mock pennyroyal
  Hedeoma pilosum Irving -- not accepted -- old blue mock pennyroyal
  Hedyotis butterwickiae (Terrell) G.L. Nesom -- not accepted -- Butterwick's starviolet
  Hedyotis elatior (H. Mann) Fosberg -- not accepted -- `uiwi
  Hedyotis formosa (Hillebr.) Fosberg -- not accepted -- Maui starviolet
  Hedyotis littoralis (Hillebr.) Fosberg -- not accepted -- seacliff starviolet
  Hedyotis nigricans var. pulvinata (Small) Fosberg -- not accepted -- diamondflowers
  Hedyotis tryblium D.R. Herbst & W.L. Wagner -- not accepted -- Kalalau Valley starviolet
  Hedysarum occidentale var. canone S.L. Welsh -- accepted -- western sweetvetch
  Helianthemum dumosum (E.P. Bicknell) Fernald -- accepted -- bushy frostweed, bushy rush-rose
  Helianthemum suffrutescens B. Schreib. -- not accepted -- Amador rush-rose
  Hesperolinon adenophyllum (A. Gray) Small -- accepted -- glandular dwarf-flax
  Hesperolinon bicarpellatum (H. Sharsm.) H. Sharsm. -- accepted -- two-carpeled dwarf-flax, twocarpel dwarf-flax
  Hesperolinon breweri (A. Gray) Small -- accepted -- Brewer's dwarf-flax
  Hesperolinon drymarioides (Curran) Small -- accepted -- Drymaria dwarf-flax, drymary dwarf-flax
  Hesperolinon tehamense H. Sharsm. -- accepted -- Paskenta Grade dwarf-flax, Tehama dwarf-flax
  Heuchera missouriensis Rosend. -- not accepted
  Hexalectris nitida L.O. Williams -- accepted -- Glass Mountain coral-root, Glass Mountain crested coralroot, Raíz-de-coral nítida
  Hexalectris revoluta Correll -- accepted -- Chisos coral-root, Chisos Mountain crested coralroot, Raíz de coral revoluta
  Hexalectris warnockii Ames & Correll -- accepted -- Raíz-de-Coral de Texas, Texas crested coralroot, Texas crested-coralroot
  Hexastylis contracta H.L. Blomq. -- accepted -- mountain heartleaf
  Hexastylis rhombiformis Gaddy -- accepted -- French broad heartleaf, North Fork heartleaf
  Hibiscadelphus crucibracteatus Hobdy -- accepted -- lava hau kuahiwi
  Hibiscus californicus Kellogg -- not accepted -- California hibiscus
  Hibiscus kokio Hillebr. ex Wawra -- accepted -- koki'o 'ula'ula, red rosemallow
  Hibiscus waimeae ssp. waimeae A. Heller -- accepted -- white Kauai rosemallow
  Hollisteria lanata S. Watson -- accepted -- false spikeflower
  Holmgrenanthe petrophila (Coville & C.V. Morton) Elisens -- accepted -- rock lady
  Horkelia bolanderi A. Gray -- accepted -- Bolander's horkelia, border horkelia
  Horkelia congesta ssp. congesta Douglas ex Hook. -- not accepted -- Sierra horkelia
  Horkelia cuneata ssp. sericea (A. Gray) D.D. Keck -- not accepted -- wedge-leaved horkelia, wedgeleaf horkelia
  Horkelia marinensis (Elmer) Crum ex D.D. Keck -- accepted -- Point Reyes horkelia
  Horkelia parryi Greene -- accepted -- Parry's horkelia
  Horkelia tularensis (J.T. Howell) Munz -- accepted -- Kern Plateau horkelia, Tulare horkelia
  Horkelia wilderae Parish -- accepted -- Barton Flats horkelia
  Hymenocallis coronaria (J. Le Conte) Kunth -- accepted -- cahaba-lily, Shoals spider-lily, shoals spiderlily
  Hymenocallis henryae Traub -- accepted -- Henry's spiderlily
  Hymenophyllum tunbrigense (L.) Sm. -- accepted -- Tunbridge fern, Tunbridge filmy fern
  Hypericum adpressum W.P.C. Barton -- accepted -- creeping St. Johnswort
  Hypericum dolabriforme Vent. -- accepted -- straggling St. Johnswort
  Hypericum edisonianum (Small) W.P. Adams & N. Robson -- accepted -- Arcadian St. Johnswort, Edison's ascyrum
  Hypericum lissophloeus W.P. Adams -- accepted -- smoothbark St. Johnswort
  Iliamna remota Greene -- accepted -- Kankakee globe-mallow
  Illicium parviflorum Michx. ex Vent. -- accepted -- yellow anise-tree, yellow anisetree
  Ipomoea krugii Urb. -- not accepted -- Krug's white morning-glory, Krug's white morningglory
  Ipomoea tenuiloba var. lemmonii (A. Gray) Yatsk. & C.T. Mason -- accepted -- Lemmon's morning-glory, spiderleaf
  Ipomopsis aggregata ssp. webberi V.E. Grant & Wilken -- not accepted
  Ipomopsis spicata ssp. robruthii Wilken & R.L. Hartm. -- accepted -- spiked ipomopsis
  Iris pariensis S.L. Welsh -- not accepted
  Isoetes lithophylla N. Pfeiff. -- not accepted -- rock quillwort
  Isoetes virginica N. Pfeiff. -- accepted -- Virginia quillwort
  Ivesia aperta var. aperta (J.T. Howell) Munz -- accepted -- Sierra Valley ivesia, Sierra Valley mousetail
  Ivesia argyrocoma (Rydb.) Rydb. -- accepted -- silver-haired ivesia, silverhair mousetail
  Ivesia callida (H.M. Hall) Rydb. -- accepted -- Tahquitz ivesia, Tahquitz mousetail
  Ivesia cryptocaulis (Clokey) D.D. Keck -- accepted -- Charleston Peak mousetail, hidden ivesia
  Ivesia jaegeri Munz & I.M. Johnst. -- accepted -- Jaeger's ivesia, Jaeger's mousetail
  Ivesia longibracteata Ertter -- accepted -- Castle Crags ivesia, longbract mousetail
  Ivesia paniculata T.W. Nelson & J.P. Nelson -- accepted -- Ash Creek ivesia, Ash Creek mousetail
  Ivesia patellifera (J.T. Howell) Ertter -- accepted -- Kingston Mountain mousetail, Kingston Mountains cinquefoil
  Ivesia pickeringii Torr. ex A. Gray -- accepted -- Pickering ivesia, silky mousetail
  Ivesia pityocharis Ertter -- accepted -- Pine Nut Mountain mousetail, Pine Nut Mountains ivesia
  Ivesia rhypara var. rhypara Ertter & Reveal -- accepted -- grimy ivesia, grimy mousetail
  Ivesia rhypara var. shellyi Ertter -- accepted -- Shelly's mousetail
  Ivesia shockleyi var. ostleri Ertter -- accepted -- Ostler's mousetail
  Jacquemontia curtissii Peter ex Small -- accepted -- pineland clustervine, pineland jacquemontia
  Jaquinia umbellata A. DC. -- not accepted
  Jepsonia malvifolia (Greene) Small -- accepted -- island jepsonia
  Juglans californica var. hindsii Jeps. -- not accepted -- Northern California black walnut
  Juglans cinerea L. -- accepted -- butternut, noyer cendré, white walnut
  Juncus caesariensis Coville -- accepted -- New Jersey rush
  Juncus leiospermus var. leiospermus F.J. Herm. -- accepted -- Red Bluff dwarf rush, Red Bluff rush
  Juncus oronensis Fernald -- not accepted
  Juncus trifidus ssp. carolinianus Hämet-Ahti -- not accepted
  Justicia borinquensis Britton -- not accepted -- Monte Cerrote 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 runyonii Small -- accepted -- Runyon's water-willow, Runyon's waterwillow
  Justicia wrightii A. Gray -- accepted -- Wright's water-willow
  Kallstroemia perennans B.L. Turner -- accepted -- perennial caltrop
  Kalmia cuneata Michx. -- accepted -- white-wicky, whitewicky
  Lachnocaulon digynum Körn. -- accepted -- pineland bogbutton, tiny bog buttons
  Lantana depressa Small -- accepted -- depressed shrubverbena
  Laplacea portoricensis (Krug & Urb.) Dyer -- accepted -- nino de cota
  Lathyrus holochlorus (Piper) C.L. Hitchc. -- accepted -- thinleaf pea
  Lathyrus jepsonii ssp. jepsonii Greene -- not accepted -- Delta tule-pea
  Leavenworthia alabamica var. alabamica Rollins -- not accepted -- Alabama gladecress
  Leavenworthia alabamica var. brachystyla Rollins -- not accepted -- Alabama gladecress
  Leavenworthia aurea Torr. -- accepted -- golden gladecress, golden yelloweye
  Leavenworthia crassa var. elongata Rollins -- not accepted -- fleshyfruit gladecress
  Leavenworthia exigua var. exigua Rollins -- not accepted -- Tennessee gladecress
  Leavenworthia exigua var. lutea Rollins -- not accepted -- Tennessee gladecress
  Lechea cernua Small -- accepted -- nodding pinweed
  Lechea divaricata Shuttlw. ex Britton -- accepted -- drysand pinweed
  Lechea lakelae Wilbur -- accepted -- Lakela's pinweed
  Lechea mensalis Hodgdon -- accepted -- Chisos Mountain pinweed, Chisos pinweed
  Legenere limosa (Greene) McVaugh -- not accepted -- false Venus' looking glass, legenere
  Leitneria floridana Chapm. -- accepted -- corkwood
  Lepanthopsis melanantha (Rchb. f.) Ames -- accepted -- tiny orchid
  Lepechinia cardiophylla Epling -- accepted -- heart-leaved pitcher-sage, Santa Ana pitchersage
  Lepechinia ganderi Epling -- accepted -- Gander's pitcher-sage, San Diego pitchersage
  Lepidium bidentatum var. remyi (Drake) Fosberg -- not accepted -- Remy's `anaunau, Remy's pepperweed
  Lepidium davisii Rollins -- accepted -- Davis' peppercress, Davis' pepperweed
  Lepidium flavum var. felipense C.L. Hitchc. -- not accepted -- Borrego Valley peppergrass, yellow pepperweed
  Lepidium jaredii ssp. album Hoover -- not accepted -- Panoche pepperweed
  Lepidium jaredii ssp. jaredii Brandegee -- not accepted -- Jared's peppergrass, Jared's pepperweed
  Lepidium serra H. Mann -- accepted -- `anaunau, anaunau
  Leptodactylon glabrum R. Patt. & Yoder-Will. -- not accepted -- Owyhee prickly gilia, smooth prickly phlox
  Leptodactylon jaegeri (Munz) Wherry -- not accepted -- San Jacinto prickly-phlox
  Leptodactylon pungens ssp. hazeliae (M. Peck) R.J. Meinke -- not accepted
  Lesquerella carinata Rollins -- not accepted -- Idaho bladderpod, keeled bladderpod
  Lesquerella condensata A. Nelson -- not accepted -- dense bladderpod, Engelmann bladderpod
  Lesquerella garrettii Payson -- not accepted -- Garrett's bladderpod
  Lesquerella kaibabensis Rollins -- not accepted -- Kaibab bladderpod
  Lesquerella macrocarpa A. Nelson -- not accepted -- large-fruited bladderpod, largefruit bladderpod
  Lesquerella paysonii Rollins -- not accepted -- Payson's bladderpod
  Lesquerella pruinosa Greene -- not accepted -- Pagosa Springs bladderpod
  Lewisia cotyledon var. heckneri (C.V. Morton) Munz -- accepted -- Heckner's lewisia
  Lewisia cotyledon var. howellii (S. Watson) Jeps. -- accepted -- Howell's lewisia
  Lewisia cotyledon var. purdyi Jeps. -- not accepted
  Lewisia longipetala (Piper) S. Clay -- accepted -- long-petaled lewisia, Truckee lewisia
  Lewisia maguirei A.H. Holmgren -- accepted -- Maguire's bitterroot, Maguire's lewisia
  Lewisia serrata Heckard & Stebbins -- accepted -- saw-toothed lewisia, sawtooth lewisia
  Lewisia stebbinsii Gankin & W.R. Hildreth -- accepted -- Stebbins lewisia, Stebbins' lewisia
  Lilaeopsis carolinensis J.M. Coult. & Rose -- accepted -- Carolina grasswort
  Lilaeopsis masonii Mathias & Constance -- accepted -- Mason's lilaeopsis, mudflat quillplant
  Lilium grayi S. Watson -- accepted -- Gray's lily
  Lilium humboldtii var. ocellatum (Kellogg) Elwes -- not accepted
  Lilium iridollae M.G. Henry -- accepted -- Panhandle lily
  Lilium parryi S. Watson -- accepted -- lemon lily, Parry lily
  Limnanthes bakeri J.T. Howell -- accepted -- Baker's meadowfoam
  Limnanthes douglasii var. sulphurea C.T. Mason -- not accepted -- Point Reyes meadowfoam
  Limnanthes floccosa ssp. bellingeriana (M. Peck) Arroyo -- accepted -- Bellinger's meadowfoam, woolly meadowfoam
  Limnanthes gracilis ssp. gracilis Howell -- not accepted -- slender meadowfoam
  Limosella pubiflora Pennell -- accepted -- Chiricahua Mountain mudwort, Chiricahua mudwort
  Linanthus concinnus Milliken -- accepted -- San Gabriel linanthus
  Linanthus harknessii ssp. condensatus H. Mason -- not accepted -- Harkness' flaxflower, Plaskett Meadows linanthus
  Linanthus killipii H. Mason -- accepted -- Baldwin Lake linanthus
  Linanthus nuttallii ssp. howellii T.W. Nelson & R. Patt. -- not accepted -- Mt. Tedoc linanthus
  Linanthus orcuttii (Parry & A. Gray) Jeps. -- accepted -- Orcutt's linanthus
  Lindera subcoriacea Wofford -- accepted -- bog spicebush
  Linum carteri var. smallii C.M. Rogers -- accepted -- Small's flax
  Linum macrocarpum C.M. Rogers -- accepted -- Spring Hill flax
  Linum sulcatum var. harperi (Small) C.M. Rogers -- accepted -- Harper's flax
  Linum westii C.M. Rogers -- accepted -- West's flax
  Litsea aestivalis (L.) Fernald -- accepted -- pondspice
  Lobelia appendiculata var. gattingeri (A. Gray) McVaugh -- not accepted -- Gattinger's lobelia
  Lobelia boykinii Torr. & A. Gray ex A. DC. -- accepted -- Boykin's lobelia
  Lobelia dunbariae Rock -- accepted -- Waihanau lobelia
  Lomatium attenuatum Evert -- accepted -- tapertip desertparsley
  Lomatium concinnum (Osterh.) Mathias -- accepted -- adobe desert-parsley, adobe desertparsley
  Lomatium congdonii J.M. Coult. & Rose -- accepted -- Congdon's lomatium, Mariposa desertparsley
  Lomatium graveolens var. clarkii S.L. Welsh -- not accepted
  Lomatium insulare (Eastw.) Munz -- accepted -- San Nicholas biscuitroot, San Nicolas Island lomatium
  Lomatium laevigatum (Nutt.) J.M. Coult. & Rose -- accepted -- Slickrock biscuitroot
  Lomatium latilobum (Rydb.) Mathias -- accepted -- Canyonlands biscuitroot, Slicrock desert-parsley
  Lomatium stebbinsii Schlessman & Constance -- accepted -- Stebbins' desertparsley, Stebbins' lomatium
  Lomatium suksdorfii (S. Watson) J.M. Coult. & Rose -- accepted -- Suksdorf's desert-parsley, Suksdorf's desertparsley
  Lomatium tuberosum Hoover -- accepted -- Hoover's desert-parsley, Hoover's desertparsley
  Lotus argophyllus ssp. niveus (Greene) Munz -- not accepted -- Santa Cruz Island silver hosackia
  Lotus crassifolius var. otayensis Moran ex Isely -- not accepted -- big deervetch, Otay lotus
  Lotus nuttallianus Greene -- not accepted -- prostrate lotus, wire bird's-foot trefoil
  Lotus purshianus var. helleri (Britton) Isely -- not accepted
  Lotus rubriflorus H. Sharsm. -- not accepted -- red-flowered lotus, redflower bird's-foot trefoil
  Lupinus antoninus Eastw. -- accepted -- Anthony Peak lupine
  Lupinus arboreus var. eximius (Burtt Davy) C.P. Sm. -- not accepted -- bush lupine, San Mateo tree lupine
  Lupinus biddlei L.F. Hend. ex C.P. Sm. -- not accepted -- Biddle's lupine
  Lupinus citrinus Kellogg -- accepted -- orange lupine, orangeflower lupine
  Lupinus constancei T.W. Nelson & J.P. Nelson -- accepted -- lassicus lupine, The Lassics lupine
  Lupinus crassus Payson -- accepted -- Paradox lupine
  Lupinus cusickii S. Watson -- accepted -- Cusick's lupine
  Lupinus duranii Eastw. -- accepted -- Mono Lake lupine
  Lupinus excubitus var. medius (Jeps.) Munz -- accepted -- Mountain Springs bush lupine, Mountains Springs bush lupine
  Lupinus guadalupensis Greene -- accepted -- Guadalupe Island lupine
  Lupinus ludovicianus Greene -- accepted -- San Luis lupine
  Lupinus magnificus var. magnificus M.E. Jones -- accepted -- Panamint Mountain lupine, Panamint Mountains lupine
  Lupinus milo-bakeri C.P. Sm. -- not accepted -- Milo Baker's lupine
  Lupinus padre-crowleyi C.P. Sm. -- accepted -- DeDecker's lupine
  Lupinus spectabilis Hoover -- accepted -- shaggy lupine, shaggy-hair lupine
  Lupinus westianus Small -- accepted -- Gulf Coast lupine, Gulfcoast lupine
  Lycium puberulum var. berberioides (Correll) Chiang -- accepted -- downy desert-thorn, downy desertthorn, silver wolfberry
  Lycium texanum Correll -- accepted -- Texas desert-thorn, Texas desertthorn, Texas wolfberry
  Lyonothamnus floribundus ssp. floribundus A. Gray -- not accepted -- Catalina ironwood
  Lysimachia fraseri Duby -- accepted -- Fraser's yellow loosestrife
  Lysimachia kalalauensis Skottsb. -- accepted -- Kauai yellow loosestrife
  Lysimachia ternifolia H. St. John -- not accepted -- threeleaf yellow loosestrife
  Lythrum curtissii Fernald -- accepted -- Curtiss' loosestrife
  Lythrum flagellare Shuttlew. ex Chapm. -- accepted -- Florida loosestrife
  Macbridea caroliniana (Walter) S.F. Blake -- accepted -- Carolina birds-in-a-nest
  Magnolia ashei Weath. -- accepted -- Ashe's magnolia
  Malacothamnus davidsonii (B.L. Rob.) Greene -- accepted -- Davidson's bush-mallow, Davidson's bushmallow
  Malacothamnus mendocinensis (Eastw.) Kearney -- not accepted -- Mendocino bush-mallow
  Malacothamnus palmeri var. involucratus (B.L. Rob.) Kearney -- not accepted -- Carmel Valley bush-mallow
  Malacothamnus palmeri var. lucianus Kearney -- not accepted -- Arroyo Seco bush-mallow
  Malacothamnus parishii (Eastw.) Kearney -- not accepted -- Parish's bush-mallow
  Malaxis brachypoda (A. Gray) Fernald -- not accepted -- adder's-mouth, white adder's-mouth orchid
  Malpighia infestissima Rich. ex Nied. -- accepted -- cowhage cherry, stingingbush
  Malvastrum hispidum (Pursh) Hochr. -- accepted -- hispid false mallow
  Manfreda longiflora (Rose) Verh-Will. -- accepted -- Amole de río, longflower tuberose, Runyon huaco
  Mappia racemosa Jacq. -- accepted -- palo de cana, palo de cańa
  Margaranthus lemmonii A. Gray -- not accepted -- Lemmon's globe berry
  Marina orcuttii var. orcuttii (S. Watson) Barneby -- accepted -- California marina
  Mariscus kunthianus Gaudich. -- not accepted
  Mariscus rockii (Kük.) T. Koyama -- not accepted
  Mariscus urbanii (Boeckeler) C.B. Clarke -- not accepted
  Marsdenia elliptica Decne. -- accepted -- jungle netvine
  Matelea alabamensis (Vail) Woodson -- accepted -- Alabama milkvine
  Matelea baldwyniana (Sweet) Woodson -- accepted -- Baldwin's milkvine
  Matelea floridana (Vail) Woodson -- accepted -- Florida milkvine
  Matelea radiata Correll -- accepted -- Falfurrias anglepod, Falfurrias milkvine
  Matelea texensis Correll -- accepted -- Texas milkvine, Trans-Pecos milkvine
  Meconella oregana Nutt. -- accepted -- white fairypoppy
  Melicope cruciata (A. Heller) T.G. Hartley & B.C. Stone -- accepted -- pilo 'ula
  Melicope haleakalae (B.C. Stone) T.G. Hartley & B.C. Stone -- accepted -- Haleakala melicope
  Melicope nealae (B.C. Stone) T.G. Hartley & B.C. Stone -- accepted
  Melicope wailauensis (H. St. John) T.G. Hartley & B.C. Stone -- accepted -- Wailau Valley melicope
  Mentzelia argillosa J. Darl. -- accepted -- Arapien blazingstar, clay blazing-star
  Mentzelia densa Greene -- accepted -- Royal Gorge blazingstar, Royal Gorge stickleaf
  Mentzelia mollis M. Peck -- accepted -- smooth blazingstar, smooth stickleaf, soft blazingstar
  Mentzelia multicaulis var. labrina K.H. Thorne & F.G. Sm. -- not accepted
  Mentzelia packardiae Glad. -- accepted -- Packard's blazingstar, Packard's stickleaf
  Mentzelia shultziorum Prigge -- accepted -- Shultz's blazingstar
  Mertensia drummondii (Lehm.) G. Don -- accepted -- Drummond bluebell, Drummond's bluebells
  Mertensia toyabensis J.F. Macbr. -- not accepted
  Micranthemum micranthemoides (Nutt.) Wettst. -- accepted -- Nuttall's micranthemum, Nuttall's mudflower
  Mimulus brandegei Pennell -- not accepted -- Santa Cruz Island monkey-flower
  Mimulus clivicola Greenm. -- accepted -- Bank monkey-flower, North Idaho monkeyflower
  Mimulus exiguus A. Gray -- accepted -- San Bernardino Mountain monkey-flower
  Mimulus filicaulis S. Watson -- accepted -- Hetch Hetchy monkey-flower, slenderstem monkeyflower
  Mimulus gemmiparus W.A. Weber -- accepted -- Rocky Mountain monkeyflower, Weber monkey-flower
  Mimulus hymenophyllus Meinke -- accepted -- thinsepal monkeyflower
  Mimulus jungermannioides Suksd. -- accepted -- liverwort monkeyflower
  Mimulus patulus Pennell -- not accepted -- stalk-leaved monkey-flower
  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 ringens var. colpophilus Fernald -- accepted -- Allegheny monkeyflower, square-stemmed monkey-flower
  Mimulus traskiae A.L. Grant -- accepted -- Santa Catalina monkey-flower
  Mimulus washingtonensis var. washingtonensis Gand. -- not accepted -- Washington monkey-flower
  Mimulus whipplei A.L. Grant -- accepted -- Whipple's monkey-flower
  Minuartia decumbens T.W. Nelson & J.P. Nelson -- accepted -- lassicus stitchwort, The Lassics sandwort
  Minuartia godfreyi (Shinners) McNeill -- accepted -- Godfrey's stitchwort
  Minuartia marcescens (Fernald) House -- accepted -- minuartie de la serpentine, serpentine stitchwort
  Mirabilis collina Shinners -- not accepted -- Sandhill four-o'clock
  Mirabilis rotundifolia (Greene) Standl. -- accepted -- roundleaf four o'clock, roundleaf four-o'clock
  Monarda fistulosa var. brevis Fosberg & Artz -- accepted
  Monardella crispa Elmer -- accepted -- crisp monardella, crisped monardella
  Monardella diaboli Hardham -- not accepted
  Monardella douglasii var. venosa (Torr.) Jeps. -- not accepted -- veiny monardella
  Monardella fructescens (Hoover) Jokerst -- not accepted -- San Luis Obispo monardella
  Monardella leucocephala A. Gray -- accepted -- Merced monardella
  Monardella linoides ssp. oblonga (Greene) Abrams -- accepted -- flax-like monardella, flaxleaf monardella
  Monardella nana ssp. leptosiphon (Torr.) Abrams -- accepted -- San Felipe monardella
  Monardella pringlei A. Gray -- accepted -- Pringle monardella, Pringle's monardella
  Monardella robisonii Epling ex Munz -- accepted -- Robison's monardella
  Montia howellii S. Watson -- accepted -- Howell's minerslettuce, Howell's montia
  Muilla clevelandii (S. Watson) Hoover -- not accepted -- San Diego goldenstar
  Musineon lineare (Rydb.) Mathias -- accepted -- narrowleaf wildparsley
  Myosurus minimus ssp. apus (Greene) G.R. Campb. -- not accepted -- little mousetail
  Myrcianthes fragrans var. simpsonii (Small) R.W. Long -- not accepted -- Simpson stopper, Simpson's stopper
  Myriophyllum laxum Shuttlw. ex Chapm. -- accepted -- loose watermilfoil
  Najas caespitosa (Maguire) Reveal -- not accepted -- Fish Lake naiad
  Najas filifolia R.R. Haynes -- accepted -- needleleaf waternymph
  Napaea dioica L. -- accepted -- glademallow
  Nemacladus twisselmannii J.T. Howell -- accepted -- Twisselmann's nemacladus, Twisselmann's threadplant
  Nemastylis floridana Small -- accepted -- fall-flowering ixia, fallflowering pleatleaf
  Nestronia umbellula Raf. -- accepted -- leechbrush
  Neviusia alabamensis A. Gray -- accepted -- Alabama snow-wreath
  Nolina arenicola Correll -- accepted -- sand sacahuista, Trans-Pecos beargrass
  Nolina atopocarpa Bartlett -- accepted -- Florida beargrass
  Nolina cismontana Dice -- accepted -- chaparral beargrass, Peninsular beargrass
  Nuphar luteum ssp. ulvaceum (G.S. Mill. & Standl.) E.O. Beal -- not accepted
  Nyssa ursina Small -- not accepted -- bear gum, bear tupelo
  Oenothera kleinii W.L. Wagner & S.W. Mill. -- not accepted -- Klein's evening-primrose, Wolf Creek evening-primrose
  Oenothera organensis Munz -- accepted -- Organ Mountain evening primrose, Organ Mountain evening-primrose, Organ Mountain eveningprimrose
  Oenothera pilosella ssp. sessilis (Pennell) Straley -- accepted -- meadow evening primrose, meadow evening-primrose, meadow eveningprimrose
  Oncidium carthagenense (Jacq.) Sw. -- not accepted -- Coot Bay dancing-lady
  Operculina triquetra (Vahl) Hallier f. -- not accepted
  Opuntia arenaria Engelm. -- not accepted -- El Paso pricklypear, sand prickly-pear, sand pricklypear
  Opuntia aureispina (S. Brack & K.D. Heil) Pinkava & B.D. Parfitt -- accepted -- golden-spined prickly-pear, Rio Grande pricklypear
  Opuntia basilaris var. brachyclada (Griffiths) Munz -- accepted -- beavertail pricklypear, short-jointed beavertail cactus
  Opuntia engelmannii var. flexospina (Griffiths) B.D. Parfitt & Pinkava -- accepted -- cactus apple, few-spined marble-seeded prickly-pear
  Opuntia heacockul Arp -- not accepted
  Opuntia imbricata var. argentea M.S. Anthony -- not accepted -- silver cholla, tree cholla, walkingstick cholla
  Opuntia lindheimeri var. linguiformis (Griffiths) L.D. Benson -- not accepted -- cow-tongue prickly-pear
  Opuntia munzii C.B. Wolf -- not accepted -- Munz cholla, Munz's cholla
  Opuntia parryi var. serpentina (Engelm.) L.D. Benson -- not accepted -- serpentine cholla, snake cholla
  Opuntia spinosissima Mill. -- not accepted -- semaphore pricklypear
  Opuntia wigginsii L.D. Benson -- not accepted -- Wiggin's cholla, Wiggins' cholla
  Opuntia X viridiflora Britton & Rose (pro sp.) -- not accepted -- rattail cholla, Santa Fe cholla
  Orbexilum macrophyllum (Rowlee ex Small) Rydb. -- accepted -- bigleaf scurfpea, largeleaf leather-root
  Oreoxis trotteri S.L. Welsh & Goodrich -- accepted -- Trotter's alpineparsley
  Orobanche valida ssp. valida Jeps. -- accepted -- Rock Creek broomrape
  Orthocarpus pachystachyus A. Gray -- accepted -- Shasta orthocarpus, Shasta owl's-clover
  Oryctes nevadensis S. Watson -- accepted -- Nevada oryctes
  Osmorhiza mexicana ssp. bipatriata (Constance & Shan) Lowry & A.G. Jones -- accepted -- Livermore sweet-cicely, Mexican sweetcicely
  Ostrya chisosensis Correll -- accepted -- Big Bend hop hornbeam, Chisos hophornbeam
  Oxypolis ternata (Nutt.) A. Heller -- not accepted -- piedmont cowbane
  Oxytheca parishii var. ciengensis Ertter -- not accepted -- Cienega Seca oxytheca
  Oxytropis campestris var. johannensis Fernald -- accepted -- Johann's locoweed
  Oxytropis campestris var. wanapum Joyal -- accepted -- field locoweed
  Oxytropis sordida ssp. barnebyana (S.L. Welsh) Jurtzev -- not accepted
  Papaver pygmaeum Rydb. -- accepted -- alpine poppy
  Parnassia caroliniana Michx. -- accepted -- Carolina grass of Parnassus, Carolina grass-of-parnassus
  Paronychia ahartii Ertter -- accepted -- Ahart's nailwort, Ahart's whitlow-wort
  Paronychia maccartii Correll -- accepted -- McCart's nailwort, McCart's whitlow-wort
  Paronychia virginica var. virginica Spreng. -- not accepted -- silvery nailwort
  Paronychia wilkinsonii S. Watson -- accepted -- Wilkinson's nailwort, Wilkinson's whitlow-wort
  Parrya rydbergii Botsch. -- accepted -- Rydberg parrya
  Passiflora berteroana Balb. ex DC. -- accepted -- pasionaria de cercas
  Passiflora bilobata Juss. -- accepted -- twolobe passionflower
  Pedicularis dudleyi Elmer -- accepted -- Dudley's lousewort
  Pedicularis semibarbata var. charlestonensis Pennell & Clokey -- accepted -- Charleston lousewort, Charleston pinewood lousewort
  Pediocactus papyracanthus (Engelm.) L.D. Benson -- not accepted -- paper-spined cactus
  Pediomelum aromaticum var. tuhyi S.L. Welsh -- not accepted
  Pediomelum castoreum (S. Watson) Rydb. -- accepted -- Beaver Dam scurfpea, Beaver Indian breadroot
  Pediomelum epipsilum (Barneby) S.L. Welsh -- not accepted
  Pediomelum pariensis (S.L. Welsh & N.D. Atwood) J.W. Grimes -- not accepted
  Penstemon absarokensis Evert -- accepted -- Absaroka beardtongue, Absaroka Range beardtongue
  Penstemon acaulis L.O. Williams -- accepted -- stemless beardtongue
  Penstemon alamosensis Pennell & G.T. Nisbet -- accepted -- Alamo beardtongue, Los Alamos beardtongue
  Penstemon albomarginatus M.E. Jones -- accepted -- white margin penstemon, white-margined penstemon, whitemargin beardtongue, whitemargin penstemon
  Penstemon ammophilum N.H. Holmgren & L.M. Shultz -- not accepted
  Penstemon angustifolius var. dulcis Neese -- accepted -- broadbeard beardtongue
  Penstemon arenarius Greene -- accepted -- Nevada sanddune beardtongue, sanddune penstemon
  Penstemon atwoodii S.L. Welsh -- accepted -- Kaiparowits beardtongue
  Penstemon barrettiae A. Gray -- accepted -- Barrett's beardtongue
  Penstemon bicolor ssp. bicolor (Brandegee) Clokey & D.D. Keck -- not accepted -- pinto beardtongue, twocolor penstemon
  Penstemon bicolor ssp. roseus Clokey & D.D. Keck -- not accepted -- pinto beardtongue, pinto penstemon, rosey pinto penstemon
  Penstemon bracteatus D.D. Keck -- accepted -- Red Canyon beardtongue
  Penstemon caryi Pennell -- accepted -- Cary beardtongue, Cary's beardtongue
  Penstemon clutei A. Nelson -- accepted -- Sunset Crater beardtongue, Sunset Crater penstemon
  Penstemon compactus (D.D. Keck) Crosswh. -- accepted -- cache beardtongue, compact penstemon
  Penstemon concinnus D.D. Keck -- accepted -- Tunnel Springs beardtongue, Tunnel Springs penstemon
  Penstemon crandallii var. atractus (D.D. Keck) N.H. Holmgren -- not accepted
  Penstemon deamii Pennell -- accepted -- Deam's beardtongue
  Penstemon degeneri Crosswh. -- accepted -- Degener beardtongue, Degener's beardtongue
  Penstemon distans N.H. Holmgren -- accepted -- Mount Trumbull beardtongue
  Penstemon filiformis (D.D. Keck) D.D. Keck -- accepted -- thread-leaved penstemon, threadleaf beardtongue
  Penstemon floribundus D. Danley -- accepted -- Cordelia beardtongue, Cordillia's beardtongue, Cordillia's penstemon
  Penstemon flowersii Neese & S.L. Welsh -- accepted -- Flowers' beardtongue
  Penstemon fruticiformis ssp. amargosae D.D. Keck -- not accepted -- Amargosa penstemon, Death Valley beardtongue
  Penstemon gibbensii Dorn -- accepted -- Gibbens beardtongue, Gibbens' beardtongue
  Penstemon glaucinus Pennell -- accepted -- blueleaf beardtongue
  Penstemon goodrichii N.H. Holmgren -- accepted -- Lapoint beardtongue
  Penstemon harringtonii Penland -- accepted -- Harrington beardtongue, Harrington's beardtongue
  Penstemon idahoensis N.D. Atwood & S.L. Welsh -- accepted -- Idaho beardtongue
  Penstemon lemhiensis (D.D. Keck) D.D. Keck & Cronquist -- accepted -- Lemhi beardtongue, Lemhi penstemon
  Penstemon leptanthus Pennell -- not accepted -- Sevier Plateau beardtongue
  Penstemon mensarum Pennell -- accepted -- tiger beardtongue
  Penstemon nanus D.D. Keck -- accepted -- dwarf beardtongue, low beardtongue
  Penstemon navajoa N.H. Holmgren -- accepted -- Navajo Mountain beardtongue
  Penstemon pahutensis N.H. Holmgren -- accepted -- Pahute penstemon, Paiute beardtongue
  Penstemon parviflorus Pennell -- not accepted -- Montezuma County beardtongue
  Penstemon parvus Pennell -- accepted -- Aquarius Plateau beardtongue, small beardtongue
  Penstemon peckii Pennell -- accepted -- Peck's beardtongue
  Penstemon personatus D.D. Keck -- accepted -- closed-lip beardtongue, closethroat beardtongue
  Penstemon pinorum L.M. Shultz & J.S. Shultz -- accepted -- Pine Valley penstemon
  Penstemon pudicus Reveal & Beatley -- accepted -- bashful penstemon, Kawich Range beardtongue
  Penstemon retrorsus Payson ex Pennell -- accepted -- Adobe Hills beardtongue
  Penstemon stephensii Brandegee -- accepted -- Stephens' beardtongue, Stephens' penstemon
  Penstemon tidestromii Pennell -- accepted -- Tidestrom beardtongue, Tidestrom's beardtongue
  Penstemon uintahensis Pennell -- accepted -- Uinta Mountain beardtongue, Uintah beardtongue
  Penstemon wardii A. Gray -- accepted -- Ward beardtongue, Ward's beardtongue
  Peperomia degeneri Yunck. -- accepted -- Kaluaaha Valley peperomia
  Peperomia megalopoda Trel. -- accepted -- Puerto Rico peperomia
  Peperomia myrtifolia (Vahl) A. Dietr. -- accepted -- myrtleleaf peperomia
  Peperomia rockii C. DC. -- accepted -- Kahuaha Forest peperomia
  Perideridia erythrorhiza (Piper) T.I. Chuang & Constance -- accepted -- red-root yampah, western yampah
  Perideridia gairdneri ssp. gairdneri (Hook. & Arn.) Mathias -- accepted -- Gairdner's yampah
  Petalonyx thurberi ssp. gilmanii (Munz) Davis & H.J. Thomps. -- accepted -- Death Valley sandpaper plant, Death Valley sandpaperplant
  Phacelia amabilis Constance -- accepted -- Saline Valley phacelia
  Phacelia argentea A. Nelson & J.F. Macbr. -- accepted -- Sand dune phacelia, sanddune phacelia
  Phacelia beatleyae Reveal & Constance -- accepted -- Beatley phacelia, Beatley's phacelia
  Phacelia ciliata var. opaca J.T. Howell -- accepted -- Great Valley phacelia, Merced phacelia
  Phacelia cinerea Eastw. ex J.F. Macbr. -- not accepted -- ashy phacelia
  Phacelia cookei Constance & Heckard -- accepted -- Cooke's phacelia
  Phacelia dalesiana J.T. Howell -- accepted -- Scott Mountain phacelia, Trinity phacelia
  Phacelia floribunda Greene -- accepted -- southern island phacelia
  Phacelia greenei J.T. Howell -- accepted -- Scott Valley phacelia
  Phacelia inconspicua Greene -- accepted -- hidden phacelia, obscure phacelia
  Phacelia insularis var. continentis J.T. Howell -- accepted -- North Coast phacelia, northcoast phacelia
  Phacelia lenta Piper -- accepted -- sticky phacelia
  Phacelia minutissima L.F. Hend. -- accepted -- least phacelia, small phacelia
  Phacelia monoensis Halse -- accepted -- Mono phacelia
  Phacelia nashiana Jeps. -- accepted -- Charlotte's phacelia
  Phacelia novenmillensis Munz -- accepted -- Nine Mile Canyon phacelia
  Phacelia pallida I.M. Johnst. -- accepted -- pale phacelia, pale scorpionweed
  Phacelia parishii A. Gray -- accepted -- Parish's phacelia
  Phacelia phacelioides (Benth.) Brand -- accepted -- Mount Diablo phacelia, Mt. Diablo phacelia
  Phacelia serrata J. Voss -- accepted -- cinder phacelia, saw phacelia, saw scorpion-weed
  Phacelia stebbinsii Constance & Heckard -- accepted -- Stebbins' phacelia
  Phacelia suaveolens ssp. keckii (Munz & I.M. Johnst.) Thorne -- accepted -- Keck's phacelia, Santiago Peak phacelia
  Phacelia utahensis J. Voss -- accepted -- Utah phacelia
  Phacelia welshii N.D. Atwood -- accepted -- Welsh phacelia, Welsh's phacelia, Welsh's scorpion-weed
  Phaseolus supinus Wiggins & Rollins -- not accepted -- supine bean
  Phialanthus myrtilloides Griseb. -- accepted -- candlewood
  Phlox bifida ssp. stellaria (A. Gray) Wherry -- accepted -- cleft phlox
  Phlox dolichantha A. Gray -- accepted -- Bear Valley Phlox, Big Bear Valley phlox
  Phlox pungens Dorn -- accepted -- prickly phlox
  Phyllanthus ericoides Torr. -- accepted -- heather leaf-flower, heather leafflower
  Phyllanthus pentaphyllus ssp. floridanus G.L. Webster -- not accepted
  Phyllostegia helleri Sherff -- accepted -- Mt. Kahili phyllostegia
  Phyllostegia imminuta (Sherff) H. St. John -- not accepted -- Lanai phyllostegia
  Physaria bellii G.A. Mulligan -- accepted -- Front Range twinpod
  Physaria didymocarpa var. lyrata C.L. Hitchc. -- not accepted -- Idaho twinpod
  Physaria dornii Lichvar -- accepted -- Tunp Range twinpod
  Physaria eburniflora Rollins -- accepted -- Devils Gate twinpod
  Physaria integrifolia var. monticola Lichvar -- not accepted -- Snake River twinpod
  Physaria saximontana var. saximontana Rollins -- not accepted -- Fremont County twinpod
  Physostegia correllii (Lundell) Shinners -- accepted -- Correll's false dragonhead
  Physostegia leptophylla Small -- accepted -- slenderleaf false dragonhead
  Physostegia longisepala P.D. Cantino -- accepted -- longsepal false dragonhead
  Pilea leptophylla Urb. -- accepted -- Puerto Rico clearweed
  Pilea multicaulis Urb. -- accepted -- Liquillo Mountain clearweed
  Pilea richardii Urb. -- accepted -- Richard's clearweed
  Pinguicula planifolia Chapm. -- accepted -- Chapman's butterwort
  Pinus contorta ssp. bolanderi (Parl.) Critchfield -- not accepted -- Bolander's beach pine
  Pinus radiata D. Don -- accepted -- insignis pine, Monterey pine, pino quebradizo
  Pinus torreyana ssp. insularis J.R. Haller -- accepted
  Pinus torreyana ssp. torreyana Parry ex Carričre -- accepted -- Torrey pine
  Pisonia wagneriana Fosberg -- accepted -- Kauai catchbirdtree
  Plagiobothrys diffusus (Greene) I.M. Johnst. -- not accepted -- San Francisco popcornflower
  Plagiobothrys figuratus ssp. corallicarpus (Piper) K.L. Chambers -- not accepted -- fragrant popcornflower
  Plagiobothrys glaber (A. Gray) I.M. Johnst. -- accepted -- glabrous allocarya, hairless popcornflower
  Plagiobothrys glyptocarpus var. modestus I.M. Johnst. -- accepted -- Cedar Crest allocarya, sculptured popcornflower
  Plagiobothrys hystriculus (Piper) I.M. Johnst. -- accepted -- bearded allocarya, bearded popcornflower
  Plagiobothrys lamprocarpus (Piper) I.M. Johnst. -- accepted -- shinyfruit popcornflower
  Plagiobothrys mollis var. vestitus (Greene) I.M. Johnst. -- accepted -- Petaluma popcornflower, soft popcornflower
  Plagiobothrys uncinatus J.T. Howell -- accepted -- Salinas Valley popcornflower
  Plantago sparsiflora Michx. -- accepted -- pineland plantain
  Platystemon californicus var. ciliatus Dunkle -- not accepted -- Santa Barbara Island cream cups
  Podistera yukonensis Mathias & Constance -- accepted -- Yukon podistera
  Pogogyne clareana J.T. Howell -- accepted -- Santa Lucia mint, Santa Lucia pogogyne
  Polemonium occidentale var. lacustre (Wherry) Lakela -- not accepted
  Polemonium pauciflorum ssp. hinckleyi (Standl.) Wherry -- accepted -- Hinckley's Jacob's ladder, Hinckley's polemonium
  Polygala boykinii var. sparsifolia Wheelock -- accepted -- Boykin's milkwort
  Polygala maravillasensis Correll -- accepted -- Maravillas milkwort
  Polygala rimulicola var. mescalerorum T. Wendt & Todsen -- not accepted -- Mescalero milkwort
  Polygonella macrophylla Small -- accepted -- large-leaved jointweed, largeleaf jointweed
  Polygonum marinense T.R. Mert. & P.H. Raven -- accepted -- Marin knotweed
  Portulaca molokiniensis Hobdy -- accepted -- 'ihi
  Portulaca villosa Cham. -- accepted -- hairy purslane
  Potamogeton confervoides Rchb. -- accepted -- Tuckerman's pondweed
  Potamogeton floridanus Small -- accepted -- Florida pondweed
  Potamogeton ogdenii Hellq. & R.L. Hilton -- accepted -- Ogden's pondweed
  Potentilla effusa var. rupincola (Osterh.) Th. Wolf -- accepted -- branched cinquefoil, Front Range cinquefoil, rock cinquefoil, rockloving cinquefoil
  Potentilla multijuga Lehm. -- accepted -- Ballona cinquefoil
  Pouteria hotteana (Urb. & Ekman) Baehni -- accepted -- redmammee
  Primula alcalina Cholewa & Douglass M. Hend. -- accepted -- bluedome primrose
  Primula capillaris N.H. Holmgren & A.H. Holmgren -- accepted -- Ruby Mountain primrose
  Primula domensis Kass & S.L. Welsh -- not accepted -- House Range primrose
  Primula hunnewellii Fernald -- not accepted -- North Rim primrose
  Primula nevadensis N.H. Holmgren -- not accepted -- Nevada primrose
  Primula tschuktschorum Kjellm. -- accepted -- chukchi primrose
  Proatriplex pleiantha (W.A. Weber) Stutz & G.L. Chu -- accepted -- Mancos shadscale
  Proboscidea sabulosa Correll -- accepted -- dune unicorn plant, sanddune unicorn-plant
  Proboscidea spicata Correll -- accepted -- many-flowered unincorn plant, New Mexico unicorn-plant
  Prunus alleghaniensis Porter -- not accepted -- Allegheny plum
  Prunus alleghaniensis var. davisii (W. Wight) Sarg. -- not accepted -- Davis' plum
  Prunus maritima var. gravesii (Small) G.J. Anderson -- not accepted -- Graves' plum
  Psidium sintenisii (Kiaersk.) Alain -- accepted -- hoja menuda, Sintenis' guava
  Psiguria cookiana (Britton) -- not accepted -- algodoncillo
  Psoralea macrophylla Rowlee ex Small -- not accepted
  Psorothamnus polyadenius var. jonesii Barneby -- not accepted
  Psorothamnus thompsonae var. whitingii (Kearney & Peebles) Barneby -- not accepted
  Pteroglossaspis ecristata (Fernald) Rolfe -- accepted -- eulophia, giant orchid
  Pyxidanthera barbulata var. brevifolia (Wells) H.E. Ahles -- not accepted -- Well's pixie-moss
  Quercus boyntonii Beadle -- accepted -- Boynton's oak, Boynton's sand post oak
  Quercus dumosa Nutt. -- accepted -- coastal sage scrub oak, Nuttall's scrub oak
  Quercus graciliformis C.H. Mull. -- accepted -- Chisos oak, slender oak
  Quercus shumardii var. acerifolia E.J. Palmer -- not accepted -- maple-leaf oak
  Quercus tardifolia C.H. Mull. -- accepted -- Chisos Mountains oak, lateleaf oak
  Randia portoricensis (Urb.) Britton & Standl. -- accepted -- Puerto Rico indigoberry
  Ranunculus austro-oreganus L.D. Benson -- accepted -- Southern Oregon buttercup
  Rhexia aristosa Britton -- accepted -- awned meadowbeauty, awnpetal meadowbeauty
  Rhexia parviflora Chapm. -- accepted -- white meadowbeauty
  Rhexia salicifolia Kral & Bostick -- accepted -- panhandle meadowbeauty
  Rhododendron prunifolium (Small) Millais -- accepted -- plumleaf azalea
  Rhus trilobata var. arenaria (Greene) F.A. Barkley -- not accepted
  Rhynchospora californica Gale -- accepted -- California beaked-rush, California beaksedge
  Rhynchospora crinipes Gale -- accepted -- hairy-peduncled beaked-rush, mosquito beadsedge, mosquito beaksedge
  Rhynchospora culixa Gale -- not accepted -- Georgia beaksedge
  Rhynchospora decurrens Chapm. -- accepted -- swampforest beaksedge
  Rhynchospora globularis var. saxicola (Small) Kük. -- accepted -- Stone Mountain beaksedge
  Rhynchospora punctata Elliott -- accepted -- dotted beaksedge
  Rhynchospora thornei Kral -- accepted -- Thorne's beaked-rush, Thorne's beaksedge
  Ribes canthariforme Wiggins -- accepted -- Moreno currant
  Ribes divaricatum var. parishii (A. Heller) Jeps. -- accepted -- Parish's gooseberry
  Ribes thacherianum (Jeps.) Munz -- accepted -- Santa Cruz gooseberry
  Ribes tularensis (Coville) Fedde -- not accepted -- Sequoia gooseberry
  Rorippa calycina (Engelm.) Rydb. -- accepted -- persistent sepal yellowcress, persistent-sepal yellowcress
  Rorippa coloradensis Stuckey -- not accepted -- San Luis watercress, San Luis yellowcress
  Rorippa columbiae (S. Watson) Howell -- accepted -- Columbia watercress, Columbian yellowcress
  Rosa minutifolia Engelm. -- accepted -- Baja rose, small-leaved rose
  Rosa stellata ssp. abyssa A.M. Phillips -- accepted -- desert rose, Grand Cayon rose
  Roystonea elata (W. Bartram) F. Harper -- not accepted -- Florida royal palm
  Rubus bartonianus M. Peck -- accepted -- Barton's raspberry
  Rubus glaucifolius var. ganderi (L.H. Bailey) Munz -- not accepted -- Cuyamaca raspberry
  Rubus macraei A. Gray -- accepted -- 'akala
  Rubus whartoniae L.H. Bailey -- not accepted -- Wharton's dewberry
  Rumex krausei Jurtzev & V.V. Petrovsky -- accepted -- Krause's sorrel
  Sagittaria sanfordii Greene -- accepted -- valley arrowhead, Valley sagittaria
  Salpingostylis coelestina (Bartram) Small -- not accepted -- Bartram's ixia
  Salvia amissa Epling -- accepted -- Aravaipa sage, Santa Catalina Mountain sage, Santa Catalina sage
  Salvia brandegei Munz -- not accepted -- Brandegee's sage
  Salvia dorrii ssp. mearnsii (Britton) E.M. McClint. -- accepted -- Mearn sage, purple sage, Verde Valley sage
  Salvia dorrii var. clokeyi Strachan -- accepted -- purple sage
  Salvia greatai Brandegee -- accepted -- lavender sage, Orocopia sage
  Salvia penstemonoides Kunth & Bouché -- accepted -- big red sage
  Sanicula kauaiensis H. St. John -- accepted -- Kauai blacksnakeroot
  Sanicula maritima Kellogg ex S. Watson -- accepted -- adobe sanicle, adobe snakeroot
  Sanicula sandwicensis A. Gray -- accepted -- Hawai'i blacksnakeroot
  Sanicula saxatilis Greene -- accepted -- devil's blacksnakeroot, rock sanicle
  Sanicula tracyi Shan & Constance -- accepted -- Tracy's blacksnakeroot, Tracy's sanicle
  Sarracenia leucophylla Raf. -- accepted -- crimson pitcherplant, white-top pitcherplant
  Sarracenia rubra ssp. wherryi D.E. Schnell -- not accepted -- Wherry's pitcherplant
  Saxifraga bryophora var. tobiasiae J.W. Grimes & P.L. Packard -- not accepted -- Tobias' saxifrage
  Saxifraga caroliniana A. Gray -- not accepted -- Carolina saxifrage, Gray's saxifrage
  Saxifraga hitchcockii Elvander -- not accepted -- Saddle Mountain saxifrage
  Schiedea menziesii Hook. -- accepted -- Menzies' schiedea
  Schrankia portoricensis Urb. -- not accepted -- zarzarilla
  Scirpus flaccidifolius (Fernald) Schuyler -- accepted -- reclining bulrush
  Scirpus hallii A. Gray -- not accepted
  Scirpus longii Fernald -- accepted -- Long's bulrush
  Sclerocactus blainei S.L. Welsh & K.H. Thorne -- accepted -- Blaine's fishhook cactus
  Sclerocactus contortus K.D. Heil -- not accepted -- Canyonlands fishhook cactus
  Sclerocactus schleseri K.D. Heil & S.L. Welsh -- not accepted -- Schleser's fishhook cactus
  Scrophularia atrata Pennell -- accepted -- black-flowered figwort, darkflowered figwort
  Scrophularia laevis Wooton & Standl. -- accepted -- Organ Mountain figwort
  Scrophularia villosa Pennell -- accepted -- Santa Catalina figwort
  Scutellaria laevis Shinners -- accepted -- Culberson County skullcap, smooth-stem skullcap
  Scutellaria ocmulgee Small -- accepted -- Ocmulgee skullcap
  Scutellaria ovata ssp. pseudoarguta Epling -- accepted -- heart-leaved skullcap, heartleaf skullcap
  Scutellaria saxatilis Riddell -- accepted -- smooth rock skullcap
  Scutellaria thieretii Shinners -- accepted -- Thieret's skullcap
  Sedum moranii R.T. Clausen -- accepted -- Reid's stonecrop, Rogue River stonecrop
  Sedum nevii A. Gray -- accepted -- Nevius' stonecrop
  Sedum oblanceolatum R.T. Clausen -- accepted -- Applegate stonecrop, oblongleaf stonecrop
  Sedum paradisum (Denton) Denton -- not accepted -- Canyon Creek stonecrop
  Sedum pinetorum Brandegee -- not accepted -- Pine City stonecrop
  Sedum pusillum Michx. -- accepted -- granite stonecrop
  Sedum radiatum ssp. depauperatum R.T. Clausen -- not accepted -- Coast Range stonecrop
  Sedum robertsianum Alexander -- accepted -- dwarf stonecrop, Robert's stonecrop
  Selaginella utahensis Flowers -- accepted -- Utah spikemoss
  Senna ripleyana (H.S. Irwin & Barneby) H.S. Irwin & Barneby -- accepted -- Ripley's senna, Ripley's wild sensitive plant
  Sesuvium trianthemoides Correll -- accepted -- roughseed sea-purslane, Texas seapurslane
  Shortia galacifolia Torr. & A. Gray -- accepted -- Oconee bells, Oconee-bells
  Shortia galacifolia var. brevistyla P.A. Davies -- accepted -- Oconee bells, short-styled Oconee-bells
  Shoshonea pulvinata Evert & Constance -- accepted -- Shoshone carrot
  Sicyos cucumerinus A. Gray -- accepted -- Gray's bur cucumber, Gray's burr cucumber
  Sida inflexa Fernald -- not accepted -- pineland fanpetals
  Sidalcea hickmanii ssp. anomala C.L. Hitchc. -- accepted -- Cuesta Pass checker, Cuesta Pass sidalcea
  Sidalcea hickmanii ssp. viridis C.L. Hitchc. -- accepted -- Marin checkerbloom, Marin checkermallow
  Sidalcea malvaeflora ssp. patula C.L. Hitchc. -- not accepted
  Sidalcea robusta A. Heller ex Roush -- accepted -- Butte County checkerbloom, Butte County sidalcea
  Sidalcea setosa C.L. Hitchc. -- accepted -- bristly-fruited checkerbloom, Edgewood checkerbloom
  Silene clokeyi C.L. Hitchc. & Maguire -- not accepted -- Clokey's campion, Clokey's catchfly
  Silene douglasii var. oraria (M. Peck) C.L. Hitchc. & Maguire -- accepted -- Cascade Head catchfly, seabluff catchfly
  Silene marmorensis Kruckeb. -- accepted -- Marble Mountain catchfly
  Silene nachlingerae Tiehm -- accepted -- Jan's catchfly, Nachlinger's campion, Nevada catchfly
  Silene occidentalis ssp. longistipitata C.L. Hitchc. & Maguire -- not accepted -- Butte County catchfly, western catchfly
  Silene ovata Pursh -- accepted -- Blue Ridge catchfly
  Silene petersonii Maguire -- accepted -- plateau catchfly
  Silene rectiramea B.L. Rob. -- accepted -- Grand Canyon campion, Grand Canyon catchfly
  Silene regia Sims -- accepted -- royal catchfly
  Silene seelyi C.V. Morton & J.W. Thomp. -- accepted -- Seely's catchfly
  Silene subciliata B.L. Rob. -- accepted -- Louisiana catchfly, scarlet catchfly
  Silene virginica var. robusta Strausb. & Core -- not accepted -- fire pink
  Sisyrinchium pallidum Cholewa & Douglass M. Hend. -- accepted -- pale blue-eyed grass
  Sium floridanum Small -- not accepted -- Florida water-parsnip
  Smelowskia pyriformis W.H. Drury & Rollins -- accepted -- pearshaped smelowskia
  Smilax leptanthera Pennell -- not accepted
  Solanum carolinense var. hirsutum (Nutt.) A. Gray -- not accepted -- apple of Sodom, bull nettle, Carolina horsenettle, devil's tomato, horsenettle, sand briar
  Solanum mucronatum O.E. Schulz -- not accepted -- pepino
  Solanum tenuilobatum Parish -- not accepted -- narrow-leaved nightshade, San Diego nightshade
  Sophora gypsophila var. guadalupensis B.L. Turner & A.M. Powell -- accepted -- Guadalupe Mountain necklacepod, Guadalupe Mountains mescal bean
  Sophora leachiana M. Peck -- accepted -- western necklacepod
  Sphaeralcea caespitosa M.E. Jones -- accepted -- Jone's globemallow, Jones' globe-mallow, tufted globemallow
  Sphaeralcea janeae (S.L. Welsh) S.L. Welsh -- accepted -- Jane's globemallow
  Sphaeralcea psoraloides S.L. Welsh -- accepted -- psoralea globemallow
  Sphaeralcea rusbyi ssp. eremicola (Jeps.) Kearney -- accepted -- Rusby's desert-mallow, Rusby's globemallow
  Spiranthes infernalis Sheviak -- accepted -- Ash Meadows ladies'-tresses, Ash Meadows lady's tresses
  Spiranthes lanceolata var. paludicola Luer -- not accepted -- leafless beaked ladiestresses
  Spiranthes polyantha Rchb. f. -- not accepted
  Stachys hyssopifolia var. lythroides (Small) J.B. Nelson -- not accepted -- hyssopleaf hedgenettle, Tallahassee hedge-nettle
  Stenogyne haliakalae Wawra -- accepted -- Haleakala stenogyne
  Stenogyne oxygona O. Deg. & Sherff -- accepted -- jeweled stenogyne
  Stillingia sylvatica ssp. tenuis (Small) D.J. Rogers -- not accepted -- queen's-delight
  Streptanthus batrachopus J.L. Morrison -- accepted -- Mt. Tamalpais jewelflower, Tamalpais jewelflower
  Streptanthus bracteatus A. Gray -- accepted -- bracted jewelflower, bracted twistflower
  Streptanthus callistus J.L. Morrison -- accepted -- Mount Hamilton jewelflower
  Streptanthus cordatus var. piutensis J.T. Howell -- accepted -- heartleaf twistflower, Piute Mountains jewelflower
  Streptanthus cutleri Cory -- accepted -- Cutler's jewelflower, Cutler's twistflower
  Streptanthus glandulosus var. hoffmanii Kruckeb. -- not accepted -- secund jewelflower
  Streptanthus hispidus A. Gray -- accepted -- Mount Diablo jewelflower
  Streptanthus insignis ssp. lyonii Kruckeb. & J.L. Morrison -- accepted -- Arburua Ranch jewelflower
  Streptanthus lemmonii S. Watson -- accepted -- Lemmon's jewelflower
  Streptanthus morrisonii ssp. kruckebergii R.W. Dolan & LaPré -- not accepted -- Krukeberg's jewelflower
  Streptanthus morrisonii ssp. morrisonii F.W. Hoffm. -- not accepted -- Morrison's jewelflower
  Streptanthus oliganthus Rollins -- accepted -- Masonic Mountain jewelflower, Masonic Mountain twistflower
  Streptanthus sparsiflorus Rollins -- not accepted -- few-flowered jewelflower, sparseflower jewelflower
  Streptanthus squamiformis Goodman -- accepted -- pineoak jewelflower, twistflower
  Stroganowia tiehmii Rollins -- not accepted -- Talapoosa Peak pearpod, Tiehm's stroganowia
  Stylisma pickeringii (Torr. ex M.A. Curtis) A. Gray -- accepted -- Pickering's dawnflower, Pickering's morning-glory
  Styrax youngae Cory -- not accepted -- Young's snowbell
  Suaeda duripes I.M. Johnst. -- not accepted -- hardtoe seepweed
  Suaeda rolandii Bassett & Crompton -- accepted -- Roland's seablite
  Sullivantia hapemanii (J.M. Coult. & Fisher) J.M. Coult. -- accepted -- Hapeman's coolwort
  Sullivantia oregana S. Watson -- accepted -- Oregon coolwort
  Sullivantia sullivantii (Torr. & A. Gray) Britton -- accepted -- Sullivant's coolwort
  Symphoricarpos guadalupensis Correll -- accepted -- Mckittrick snowberry, McKittrick's snowberry
  Talinum calcaricum S. Ware -- not accepted -- limestone fameflower
  Talinum humile Greene -- not accepted -- Pinos Altos fameflower
  Talinum marginatum Greene -- not accepted -- Tepic fameflower
  Talinum rugospermum Holz. -- not accepted -- prairie fameflower, rough-seeded fameflower
  Talinum thompsonii N.D. Atwood & S.L. Welsh -- not accepted -- Cedar Mountain fameflower
  Talinum validulum Greene -- not accepted -- Tusayan fameflower
  Tauschia hooveri Mathias & Constance -- accepted -- Hoover's tauschia, Hoover's umbrellawort
  Tauschia howellii (J.M. Coult. & Rose) J.F. Macbr. -- accepted -- Howell's tauschia, Howell's umbrellawort
  Taxus floridana Nutt. ex Chapm. -- accepted -- Florida yew
  Tectaria coriandrifolia (Sw.) Underw. -- accepted -- hairy halberd fern, Hattie Bauer's halberd fern
  Tectaria X amesiana A.A. Eaton (pro sp.) -- accepted -- Ames' halberd fern
  Tephrosia angustissima Shuttlew. ex Chapm. -- accepted -- narrowleaf hoarypea
  Tephrosia mohrii (Rydb.) R.K. Godfrey -- accepted -- pineland hoary-pea
  Tetracoccus dioicus Parry -- accepted -- four-pod spurge, Parry's tetracoccus, red shrubby-spurge
  Thalictrum arkansanum B. Boivin -- accepted -- Arkansas meadow-rue, Arkansas meadowrue
  Thalictrum mirabile Small -- accepted -- little mountain meadow-rue
  Thalictrum subrotundum B. Boivin -- not accepted
  Thalictrum texanum (A. Gray) Small -- accepted -- Houston meadow-rue, Houston meadowrue
  Thelocactus bicolor var. flavidispinus Backeb. -- not accepted -- glory of Texas
  Thelypodium eucosmum B.L. Rob. -- accepted -- world thelypody
  Thelypodium repandum Rollins -- accepted -- Jaeger's thelypody, wavyleaf thelypody
  Thelypodium tenue Rollins -- not accepted -- Big Bend thelypody, Fresno Creek thelypody
  Thelypteris hastata var. heterodoxa Proctor -- accepted -- arrowhead maiden fern
  Thermopsis macrophylla var. agnina J.T. Howell -- not accepted -- Santa Barbara false-lupine
  Thermopsis macrophylla var. semota Jeps. -- not accepted -- velvety false-lupine
  Tofieldia glabra Nutt. -- accepted -- smooth bog-asphodel, smooth tofieldia
  Tofieldia glutinosa ssp. absona C.L. Hitchc. -- not accepted -- Priest Lake tofieldia
  Tomanthera auriculata (Michx.) Raf. -- not accepted -- auriculate false-foxglove
  Tomanthera caddoensis (Pennell) -- not accepted -- Caddo purple false-foxglove
  Tomanthera pseudaphylla (Pennell) -- not accepted -- Shinner's false-foxglove
  Tomanthera skinneriana (Alph. Wood) -- not accepted -- purple false-foxglove
  Tradescantia ozarkana E.S. Anderson & Woodson -- accepted -- Ozark spiderwort
  Tragia saxicola Small -- accepted -- Florida Keys noseburn
  Trematolobelia grandifolia (Rock) O. Deg. -- accepted -- largeflower false lobelia
  Trifolium andinum var. podocephalum Barneby -- accepted -- Currant Summit clover, Intermountain clover
  Trifolium barnebyi (Isely) Dorn & Lichvar -- accepted -- Barneby's clover
  Trifolium bolanderi A. Gray -- accepted -- parasol clover
  Trifolium calcaricum J.L. Collins & Wieboldt -- accepted -- running glade clover
  Trifolium leibergii A. Nelson & J.F. Macbr. -- accepted -- Leiberg's clover
  Trifolium macilentum var. rollinsii (J.M. Gillett) Barneby -- not accepted
  Trifolium neurophyllum Greene -- accepted -- White Mountain clover
  Trifolium owyheense Gilkey -- accepted -- Owyhee clover
  Triglochin gaspense Lieth & D. Löve -- not accepted -- Gaspe peninsula arrow-grass, Gaspé Peninsula arrowgrass, troscart de la Gaspésie
  Triglochin gaspensis Lieth & D. Löve -- accepted -- Gaspé Peninsula arrow-grass, Gaspé Peninsula arrowgrass, troscart de la Gaspésie
  Trillium pusillum var. monticulum Bodkin & Reveal -- not accepted
  Trillium pusillum var. ozarkanum (E.J. Palmer & Steyerm.) Steyerm. -- accepted -- Ozark trillium, Ozark wakerobin
  Trillium pusillum var. pusillum Michx. -- accepted -- dwarf wakerobin
  Trillium pusillum var. texanum (Buckley) Reveal & C.R. Broome -- not accepted -- Texas trillium
  Trillium pusillum var. virginianum Fernald -- accepted -- Virginia trillium, Virginia wakerobin
  Triphora craigheadii Luer -- accepted -- Craighead's nodding-caps
  Triphora latifolia G.M. Luer -- not accepted -- broadleaf noddingcaps
  Triphora rickettii Luer -- not accepted -- Yucatan noddingcaps
  Triphysaria floribunda (Benth.) T.I. Chuang & Heckard -- accepted -- San Francisco owl's-clover
  Triteleia clementina Hoover -- accepted -- San Clemente Island triteleia
  Tropidocarpum californicum (Al-Shehbaz) Al-Shehbaz -- accepted -- caper-fruited tropidocarpum, king's gold
  Urtica chamaedryoides Pursh -- accepted -- heartleaf nettle, slim stingingnettle
  Vaccinium hirsutum Buckley -- accepted -- hairy blueberry, small cluster blueberry, wooly berry
  Vaccinium sempervirens Rayner & L.F. Hend. -- not accepted -- Raynor's huckleberry
  Vauquelinia californica ssp. pauciflora (Standl.) W.J. Hess & Henrickson -- accepted -- Arizona rosewood, limestone rosewood
  Verbena maritima Small -- not accepted
  Verbena riparia Raf. ex Small & A. Heller -- not accepted -- riverbank vervain
  Verbena tampensis Nash -- not accepted
  Viburnum bracteatum Rehder -- accepted -- bracted arrowwood
  Vicia ocalensis R.K. Godfrey & Kral -- accepted -- Ocala vetch
  Viola franksmithii N.H. Holmgren -- not accepted -- Frank Smith's violet
  Viola guadalupensis A.M. Powell & Wauer -- accepted -- Guadalupe Mountain violet, Guadalupe violet
  Viola lithion N.H. Holmgren & P.K. Holmgren -- accepted -- rock violet
  Viola novae-angliae House -- not accepted -- New England blue violet, New England violet
  Viola primulifolia ssp. occidentalis (A. Gray) L.E. McKinney & R.J. Little -- not accepted -- western bog violet
  Waldstenia lobata (Baldwin) Torr. & A. Gray -- not accepted
  Wikstroemia skottsbergiana Sparre -- accepted -- Skottsberg's false ohelo
  Wikstroemia villosa Hillebr. -- accepted -- hairy false ohelo
  Wilkstroemia bicornuta Hillebr. -- not accepted
  Woodsia oregana var. cathcartiana (B.L. Rob.) C.V. Morton -- not accepted -- Oregon woodsia
  Xyris drummondii Malme -- accepted -- Drummond's yellow-eyed grass
  Xyris isoetifolia Kral -- accepted -- quillwort yelloweyed grass
  Xyris longisepala Kral -- accepted -- karst pond xyris, Kral's yelloweyed grass
  Xyris scabrifolia R.M. Harper -- accepted -- Harper's yelloweyed grass
  Zizia latifolia Small -- not accepted

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