Integrated Taxonomic Information System - Search Results
Results of: Search in every Kingdom for Taxon Author(s) Name(s) containing 'Pennell'
 
 Kingdom Animalia
  Anomalocera opalus Pennell, 1976 – valid
 
 Kingdom Plantae
  Antirrhinum coulterianum ssp. orcuttianum (A. Gray) Pennell – not accepted
  Asarina filipes (A. Gray) Pennell – not accepted
  Brachystigma wrightii (A. Gray) Pennell – accepted – Wright's brachystigma, Arizona desert foxglove
  Buchnera arizonica (A. Gray) Pennell – not accepted – Arizona bluehearts
  Cordylanthus bolanderi (A. Gray) Pennell – not accepted
  Dicranostegia (A. Gray) Pennell – accepted
  Dicranostegia orcuttiana (A. Gray) Pennell – accepted – Orcutt's bird's-beak
  Penstemon cyananthus ssp. subglaber (A. Gray) Pennell – not accepted
  Schistophragma intermedia (A. Gray) Pennell – not accepted – harlequin spiralseed
  Schistophragma intermedium (A. Gray) Pennell – accepted – harlequin spiralseed
  Seymeria texana (A. Gray) Pennell – accepted – Texas blacksenna
  Castilleja inverta (A. Nelson & J.F. Macbr.) Pennell & Ownbey – not accepted
  Mimulus constrictus (A.L. Grant) Pennell – not accepted
  Mimulus linearifolius (A.L. Grant) Pennell – not accepted
  Mimulus rattanii ssp. decurtatus (A.L. Grant) Pennell – not accepted
  Mimulus rattanii var. decurtatus (A.L. Grant) Pennell – accepted – Rattan's monkeyflower
  Mimulus subulatus (A.L. Grant) Pennell – not accepted
  Mecardonia vandellioides auct. non (Kunth) Pennell – not accepted
  Agalinis filicaulis (Benth.) Pennell – accepted – Jackson false foxglove
  Agalinis strictifolia (Benth.) Pennell – accepted – stiffleaf false foxglove
  Aureolaria grandiflora (Benth.) Pennell – accepted – largeflower yellow false foxglove
  Aureolaria grandiflora var. grandiflora (Benth.) Pennell – not accepted – largeflower yellow false foxglove
  Gerardia gatesii (Benth.) Pennell – not accepted
  Gerardia maritima ssp. grandiflora (Benth.) Pennell – not accepted
  Gerardia tenuifolia ssp. macrophylla (Benth.) Pennell – not accepted
  Mimulus glabratus ssp. fremontii (Benth.) Pennell – not accepted
  Mimulus guttatus var. lyratus (Benth.) Pennell – not accepted
  Mimulus guttatus var. microphyllus (Benth.) Pennell – not accepted
  Tomanthera densiflora (Benth.) Pennell – not accepted
  Veronica wormskjoldii ssp. nutans (Bong.) Pennell – accepted – American alpine speedwell
  Agalinis georgiana (C.L. Boynt.) Pennell – accepted
  Rhinanthus borealis ssp. kyrollae (Chabert) Pennell – not accepted
  Rhinanthus borealis ssp. kyrolliae (Chabert) Pennell – not accepted
  Agalinis divaricata (Chapm.) Pennell – accepted – pineland false foxglove
  Aureolaria patula (Chapm.) Pennell – accepted – spreading yellow false foxglove
  Hemianthus glomeratus (Chapm.) Pennell – not accepted
  Lindernia ciliata (Colsmann) Pennell – accepted – fringed false pimpernel
  Asarina petrophila (Coville & C.V. Morton) Pennell – not accepted
  Asarina erubescens (D. Don) Pennell – not accepted
  Castilleja wightii ssp. anacapensis (Dunkle) Pennell – not accepted
  Gratiola viscidula ssp. shortii Durand ex Pennell – not accepted
  Gratiola viscidula var. shortii (Durand ex Pennell) Gleason – not accepted
  Castilleja arachnoidea ssp. shastensis (Eastw.) Pennell – not accepted
  Castilleja douglasii ssp. insularis (Eastw.) Pennell – not accepted
  Castilleja glandulifera ssp. pallida (Eastw.) Pennell – not accepted
  Castilleja mendocinensis (Eastw.) Pennell – accepted – Mendocino Coast Indian paintbrush, Mendocino coast paintbrush
  Castilleja psittacina (Eastw.) Pennell – not accepted
  Asarina wislizeni (Engelm. ex A. Gray) Pennell – not accepted
  Agalinis spiciflora (Engelm.) Pennell – not accepted
  Veronica catenata var. glandulosa (Farw.) Pennell – not accepted
  Cracca angustifolia (Featherm.) Pennell – not accepted
  Aureolaria pedicularia ssp. ambigens (Fernald) Pennell – not accepted
  Castilleja hispida ssp. abbreviata (Fernald) Pennell – not accepted
  Veronica wormskjoldii ssp. alterniflora (Fernald) Pennell – not accepted
  Synthyris platycarpa Gail & Pennell – accepted – Idaho kittentails
  Agalinis decemloba (Greene) Pennell – accepted – ten-lobed false foxglove
  Agalinis paupercula var. neoscotica (Greene) Pennell & H. St. John – not accepted
  Castilleja arachnoidea ssp. schizotricha (Greenm.) Pennell – not accepted
  Asarina stricta (Hook. & Arn.) Pennell – not accepted
  Mimulus guttatus ssp. scouleri (Hook.) Pennell – not accepted
  Synthyris missurica ssp. major (Hook.) Pennell – accepted
  Synthyris missurica var. major (Hook.) Pennell ex R.J. Davis – not accepted
  Collinsia rattanii ssp. glandulosa (Howell) Pennell – accepted – sticky blue eyed Mary
  Cordylanthus viscidus (Howell) Pennell ex M. Peck – not accepted
  Asarina antirrhiniflora (Humb. & Bonpl. ex Willd.) Pennell – not accepted
  Cordylanthus brunneus (Jeps.) Pennell – not accepted
  Bacopa eisenii (Kellogg) Pennell – accepted – western hydranthele, Gila River waterhyssop
  Collinsia bartsiifolia var. hirsuta (Kellogg) Pennell – accepted – white blue eyed Mary
  Veronica peregrina ssp. xalapensis (Kunth) Pennell – not accepted – hairy purslane speedwell, neckweed
  Veronica peregrina var. xalapensis (Kunth) Pennell – not accepted
  Agalinis purpurea (L.) Pennell – accepted – purple false foxglove
  Agalinis purpurea var. purpurea (L.) Pennell – accepted – purple false foxglove
  Aureolaria virginica (L.) Pennell – accepted – downy yellow false foxglove
  Bacopa monnieri (L.) Pennell – accepted – herb-of-grace, coastal waterhyssop, herb of grace
  Kneiffia perennis (L.) Pennell – not accepted
  Lindernia dubia (L.) Pennell – accepted – moistbank pimpernel, yellow-seed false pimpernel, shortstalk lindernia, yellowseed false pimpernel
  Lindernia dubia var. dubia (L.) Pennell – not accepted – yellowseed false pimpernel, yellow-seed false pimpernel
  Aureolaria pedicularia (L.) Raf. ex Pennell – accepted – fernleaf yellow false foxglove
  Penstemon fruticosus ssp. scouleri (Lindl.) Pennell & D.D. Keck – not accepted
  Penstemon dolius M.E. Jones ex Pennell – accepted – Jone's penstemon, Jones' beardtongue
  Penstemon dolius var. dolius M.E. Jones ex Pennell – not accepted – Jones' beardtongue, Jones' penstemon
  Penstemon congestus (M.E. Jones) Pennell – not accepted
  Penstemon deustus ssp. sudans (M.E. Jones) Pennell & D.D. Keck – not accepted
  Aureolaria calycosa (Mack. & Bush) Pennell – not accepted
  Castilleja pallida ssp. elegans (Malte) Pennell – not accepted
  Hydranthelium rotundifolium (Michx.) Pennell – not accepted
  Lindernia anagallidea (Michx.) Pennell – not accepted
  Tragiola pilosa (Michx.) Small & Pennell – not accepted
  Collinsia austromontana (Newsom) Pennell – not accepted
  Agalinis tenuifolia var. parviflora (Nutt.) Pennell – not accepted – slender-leaf false foxglove, slenderleaf false foxglove
  Aureolaria pectinata (Nutt.) Pennell – accepted – combleaf yellow false foxglove
  Gerardia tenuifolia ssp. parviflora (Nutt.) Pennell – not accepted
  Peniophyllum linifolium (Nutt.) Pennell – not accepted
  Penstemon retrorsus Payson ex Pennell – accepted – Adobe Hills beardtongue
  Penstemon retrosus Payson ex Pennell – not accepted
  Acerates hirtella Pennell – not accepted
  Afzelia pectinata ssp. peninsularis Pennell – not accepted
  Agalinis acuta Pennell – not accepted – sandplain gerardia, sandplain false foxglove
  Agalinis caddoensis Pennell – accepted – Caddo false foxglove
  Agalinis calycina Pennell – accepted – leoncita false foxglove
  Agalinis delicatula Pennell – not accepted
  Agalinis edwardsiana Pennell – accepted – plateau false foxglove
  Agalinis edwardsiana var. glabra Pennell – not accepted
  Agalinis fasciculata var. peninsularis Pennell – not accepted
  Agalinis harperi Pennell – accepted – coastal plain false foxglove
  Agalinis holmiana Pennell – not accepted
  Agalinis homalantha Pennell – accepted – San Antonio false foxglove
  Agalinis keyensis Pennell – not accepted
  Agalinis laxa Pennell – accepted – twoline false foxglove
  Agalinis oligophylla Pennell – accepted – ridgestem false foxglove
  Agalinis oligophylla var. pseudaphylla Pennell – not accepted
  Agalinis paupercula var. borealis Pennell – not accepted – smallflower false foxglove
  Agalinis pinetorum Pennell – not accepted – coastalplain false foxglove, coastal plain false foxglove
  Agalinis pulchella Pennell – accepted – purple gerardia, St. Mark's false foxglove
  Agalinis purpurea var. carteri Pennell – not accepted
  Agalinis stenophylla Pennell – not accepted
  Agalinis tenella Pennell – accepted
  Antirrhinum multiflorum Pennell – not accepted
  Aureolaria flava ssp. macrantha Pennell – not accepted
  Aureolaria flava ssp. typica Pennell – not accepted
  Aureolaria flava var. macrantha Pennell – not accepted – smooth yellow false foxglove
  Aureolaria grandiflora ssp. typica Pennell – not accepted
  Aureolaria grandiflora var. cinerea Pennell – not accepted – largeflower yellow false foxglove
  Aureolaria grandiflora var. pulchra Pennell – not accepted – largeflower yellow false foxglove
  Aureolaria microcarpa Pennell – not accepted
  Aureolaria pectinata ssp. floridana Pennell – not accepted
  Aureolaria pectinata ssp. typica Pennell – not accepted
  Aureolaria pectinata var. eurycarpa Pennell – not accepted
  Aureolaria pectinata var. ozarkensis Pennell – not accepted
  Aureolaria pectinata var. transcendens Pennell – not accepted
  Aureolaria pedicularia ssp. caesariensis Pennell – not accepted
  Aureolaria pedicularia ssp. carolinensis Pennell – not accepted
  Aureolaria pedicularia ssp. typica Pennell – not accepted
  Aureolaria pedicularia var. austromontana Pennell – not accepted – fernleaf yellow false foxglove
  Aureolaria pedicularia var. intercedens Pennell – not accepted – fernleaf yellow false foxglove
  Besseya arizonica Pennell – not accepted – Arizona coraldrops
  Besseya oblongifolia Pennell – not accepted – eggleaf coraldrops
  Brachystigma Pennell – accepted – desert foxglove
  Buchnera breviflora Pennell – not accepted
  Castilleja annua Pennell – accepted – Fairbanks annual Indian paintbrush
  Castilleja chrymactis Pennell – accepted – green Indian paintbrush
  Castilleja ciliata Pennell – not accepted
  Castilleja citrina Pennell – not accepted
  Castilleja clokeyi Pennell – not accepted
  Castilleja elongata Pennell – not accepted – tall paintbrush
  Castilleja franciscana Pennell – not accepted
  Castilleja fulva Pennell – accepted – Elko Indian paintbrush
  Castilleja glandulifera Pennell – accepted – gland Indian paintbrush
  Castilleja gyroloba Pennell – not accepted
  Castilleja henryae Pennell – not accepted
  Castilleja hispida ssp. acuta Pennell – accepted – acute Indian paintbrush
  Castilleja hyetophila Pennell – accepted – coastal red Indian paintbrush
  Castilleja hyperborea Pennell – accepted – northern Indian paintbrush
  Castilleja inflata Pennell – not accepted
  Castilleja labiata Pennell – not accepted
  Castilleja latebracteata Pennell – not accepted
  Castilleja litoralis Pennell – not accepted
  Castilleja ludoviciana Pennell – not accepted – Jeff Davis Parish Indian paintbrush
  Castilleja mearnsii Pennell – not accepted
  Castilleja mogollonica Pennell – not accepted – White Mountains paintbrush
  Castilleja mollis Pennell – accepted – softleaf Indian paintbrush, soft-leaved paintbrush, soft-leaved Indian paintbrush
  Castilleja muelleri Pennell – not accepted – Kluane Lake Indian paintbrush
  Castilleja oreopola ssp. albida Pennell – not accepted
  Castilleja ownbeyana Pennell – not accepted – common Wallowa paintbrush
  Castilleja pallida ssp. caudata Pennell – not accepted
  Castilleja peckiana Pennell – accepted – Peck's Indian paintbrush, peakpaintbrush
  Castilleja raupii Pennell – accepted – Raup's Indian paintbrush, castilléjie de Raup
  Castilleja setosa Pennell – accepted
  Castilleja steenensis Pennell – not accepted
  Castilleja taedifera Pennell – not accepted
  Castilleja thompsonii Pennell – accepted – Thompson's Indian paintbrush
  Castilleja tortifolia Pennell – not accepted
  Castilleja villosissima Pennell – not accepted
  Castilleja wallowensis Pennell – accepted – Wallowa Indian paintbrush
  Castilleja wherryana Pennell – not accepted
  Castilleja wightii ssp. rubra Pennell – not accepted
  Castilleja williamsii Pennell – not accepted
  Castilleja xanthotricha Pennell – accepted – yellowhair Indian paintbrush
  Castilleja yukonis Pennell – accepted – Yukon Indian paintbrush
  Cerastium arvense var. villosissimum Pennell – not accepted
  Chamaecrista keyensis Pennell – not accepted
  Chelone glabra var. typica Pennell – not accepted
  Cordylanthus capillaris Pennell – not accepted
  Cordylanthus carnulosus Pennell – not accepted
  Cordylanthus compactus Pennell – not accepted
  Cordylanthus diffusus Pennell – not accepted
  Cordylanthus ferrisianus Pennell – not accepted
  Cordylanthus hispidus Pennell – not accepted
  Cordylanthus pallescens Pennell – not accepted
  Cordylanthus platycephalus Pennell – not accepted
  Cordylanthus ramosus ssp. setosus Pennell – not accepted
  Cordylanthus tenuifolius Pennell – not accepted
  Eysenhardtia angustifolia Pennell – not accepted
  Gerardia edwardsiana ssp. typica Pennell – not accepted
  Gerardia paupercula var. typica Pennell – not accepted
  Gerardia pulchella Pennell – not accepted
  Gerardia pulcherrima Pennell – not accepted
  Gerardia purpurea ssp. parvula Pennell – not accepted
  Gerardia racemulosa Pennell – not accepted
  Gerardia tenuifolia var. typica Pennell – not accepted
  Gratiola aurea var. obtusa Pennell – not accepted
  Gratiola pilosa var. epilis Pennell – not accepted
  Gratiola virginiana var. aestuariorum Pennell – accepted – roundfruit hedgehyssop
  Gratiola viscidula Pennell – accepted – Short's hedgehyssop
  Gratiola viscidula ssp. viscidula Pennell – not accepted
  Kneiffia brevistipata Pennell – not accepted
  Kneiffia semiglandulosa Pennell – not accepted
  Leucophyllum violaceum Pennell – not accepted
  Limosella pubiflora Pennell – accepted – Chiricahua Mountain mudwort, Chiricahua mudwort
  Lindernia dubia var. typica Pennell – not accepted
  Maurandya acerifolia Pennell – not accepted
  Mecardonia acuminata var. peninsularis Pennell – accepted – axilflower
  Mimulus bifidus Pennell – not accepted
  Mimulus bifidus ssp. fasciculatus Pennell – not accepted
  Mimulus bifidus var. bifidus Pennell – not accepted
  Mimulus brachiatus Pennell – accepted – serpentine monkeyflower
  Mimulus brandegeei Pennell – accepted – Santa Cruz Island monkeyflower
  Mimulus brandegei Pennell – not accepted – Santa Cruz Island monkey-flower
  Mimulus glabratus ssp. michiganensis Pennell – not accepted – Michigan monkey flower
  Mimulus glabratus ssp. typicus Pennell – not accepted
  Mimulus glabratus ssp. utahensis Pennell – not accepted
  Mimulus guttatus ssp. arenicola Pennell – not accepted
  Mimulus guttatus ssp. litoralis Pennell – not accepted
  Mimulus guttatus ssp. littoralis Pennell – not accepted
  Mimulus laxus Pennell – not accepted
  Mimulus macranthus Pennell – not accepted
  Mimulus maguirei Pennell – not accepted
  Mimulus microcarpus Pennell – not accepted
  Mimulus microphyton Pennell – not accepted
  Mimulus multiflorus Pennell – not accepted
  Mimulus pardalis Pennell – not accepted
  Mimulus patulus Pennell – not accepted – stalk-leaved monkey-flower
  Mimulus platycalyx Pennell – accepted – widecalyx monkeyflower
  Mimulus platylaemus Pennell – accepted – widethroat pink monkeyflower
  Mimulus trisulcatus Pennell – not accepted
  Mimulus unimaculatus Pennell – not accepted
  Monarda punctata ssp. immaculata Pennell – not accepted – spotted beebalm
  Monarda punctata ssp. villicaulis Pennell – not accepted
  Pedicularis anaticeps Pennell – not accepted
  Pedicularis attollens ssp. protogyna Pennell – accepted – little elephantshead
  Pedicularis flavida Pennell – not accepted
  Pedicularis latifolia Pennell – not accepted
  Pedicularis pachyrhiza Pennell – not accepted
  Pedicularis paddoensis Pennell – not accepted
  Pedicularis paysoniana Pennell – not accepted
  Pedicularis puchella Pennell – not accepted
  Pedicularis pulchella Pennell – accepted – mountain lousewort
  Pedicularis racemosa ssp. alba Pennell – accepted – sickletop lousewort
  Pedicularis thompsonii Pennell – not accepted
  Penstemon abietinus Pennell – accepted – firleaf beardtongue
  Penstemon aggregatus Pennell – not accepted
  Penstemon alluviorum Pennell – not accepted – lowland beardtongue
  Penstemon arkansanus Pennell – accepted – Arkansas beardtongue
  Penstemon arkansanus var. pubescens Pennell – not accepted
  Penstemon auriberbis Pennell – accepted – Colorado beardtongue
  Penstemon brevisepalus Pennell – accepted
  Penstemon brittoniorum Pennell – not accepted
  Penstemon buckleyi Pennell – accepted – Buckley's penstemon, Buckley's beardtongue
  Penstemon caespitosus ssp. perbrevis Pennell – not accepted
  Penstemon canescens var. typicus Pennell – not accepted
  Penstemon carnosus Pennell – accepted – fleshy beardtongue
  Penstemon caryi Pennell – accepted – Cary's beardtongue, Cary beardtongue
  Penstemon cobaea ssp. typicus Pennell – not accepted
  Penstemon cobaea var. purpureus Pennell – accepted – cobaea beardtongue
  Penstemon cyananthus ssp. longiflorus Pennell – not accepted
  Penstemon cyaneus Pennell – accepted – blue penstemon
  Penstemon deamii Pennell – accepted – Deam's beardtongue
  Penstemon elegantulus Pennell – accepted – rockvine penstemon
  Penstemon flavescens Pennell – accepted – high mountain penstemon
  Penstemon garrettii Pennell – not accepted – Garrett's beardtongue
  Penstemon glaucinus Pennell – accepted – blueleaf beardtongue
  Penstemon jonesi Pennell – not accepted
  Penstemon laevis Pennell – accepted – southwestern penstemon, southwestern beardtongue
  Penstemon laxiflorus Pennell – accepted – nodding beardtongue
  Penstemon leiophyllus Pennell – accepted – smoothleaf penstemon, smoothleaf beardtongue
  Penstemon leiophyllus var. leiophyllus Pennell – accepted – smoothleaf beardtongue, smoothleaf penstemon
  Penstemon lentus Pennell – accepted – handsome penstemon, handsome beardtongue
  Penstemon lentus var. lentus Pennell – accepted – handsome beardtongue
  Penstemon leptanthus Pennell – not accepted – Sevier Plateau beardtongue
  Penstemon mensarum Pennell – accepted – tiger beardtongue
  Penstemon multicaulis Pennell – not accepted
  Penstemon nitidus ssp. polyphyllus Pennell – not accepted
  Penstemon oklahomensis Pennell – accepted – Oklahoma penstemon, Oklahoma beardtongue
  Penstemon ophianthus Pennell – accepted – coiled anther penstemon, Arizona beardtongue
  Penstemon osterhoutii Pennell – accepted – Osterhout's 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 saxosorum Pennell – accepted – upland beardtongue
  Penstemon scariosus Pennell – accepted – White River beardtongue
  Penstemon scariosus var. scariosus Pennell – accepted – White River beardtongue
  Penstemon spatulatus Pennell – accepted – Wallowa beardtongue
  Penstemon strictus ssp. angustus Pennell – not accepted
  Penstemon subserratus Pennell – accepted – finetooth beardtongue
  Penstemon tenuiflorus Pennell – accepted – eastern whiteflower beardtongue
  Penstemon tidestromii Pennell – accepted – Tidestrom's beardtongue, Tidestrom beardtongue
  Penstemon triflorus ssp. integrifolius Pennell – not accepted – Heller's beardtongue
  Penstemon uintahensis Pennell – accepted – Uinta Mountain beardtongue, Uintah beardtongue
  Penstemon versicolor Pennell – accepted – variable-color beardtongue
  Penstemon wherryi Pennell – not accepted
  Penstemon wisconsinensis Pennell – not accepted
  Polygala pretzii Pennell – not accepted
  Polygala verticillata var. sphenostachya Pennell – not accepted – whorled milkwort
  Rhexia interior Pennell – not accepted
  Schwalbea australis Pennell – not accepted
  Scrophularia atrata Pennell – accepted – darkflowered figwort, black-flowered figwort
  Scrophularia davidsonii Pennell – not accepted
  Scrophularia minutiflora Pennell – accepted – littleflower figwort
  Scrophularia multiflora Pennell – not accepted
  Scrophularia oregana Pennell – not accepted – Oregon figwort
  Scrophularia villosa Pennell – accepted – Santa Catalina figwort
  Smilax leptanthera Pennell – not accepted
  Stemodia arizonica Pennell – not accepted
  Synthyris borealis Pennell – accepted – northern kittentails
  Synthyris canbyi Pennell – accepted – Mission Mountain kittentails
  Synthyris cymopteroides Pennell – not accepted
  Synthyris hendersonii Pennell – not accepted
  Synthyris laciniata ssp. ibapahensis Pennell – not accepted
  Synthyris missurica ssp. hirsuta Pennell – not accepted – western mountain kittentails
  Synthyris ranunculina Pennell – accepted – Charleston Mountain kittentails
  Synthyris stellata Pennell – not accepted
  Tomanthera caddoensis (Pennell) – not accepted – Caddo purple false-foxglove
  Tomanthera pseudaphylla (Pennell) – not accepted – Shinner's false-foxglove
  Veronica catenata Pennell – accepted – sessile water-speedwell, chain speedwell
  Veronica connata ssp. glaberrima Pennell – not accepted
  Veronica connata var. typica Pennell – not accepted
  Veronica glandifera Pennell – not accepted
  Veronica peregrina var. typica Pennell – not accepted
  Cordylanthus glandulosus Pennell & Clokey – not accepted
  Pedicularis semibarbata var. charlestonensis Pennell & Clokey – accepted – Charleston pinewood lousewort, Charleston lousewort
  Pedicularis semibarbata ssp. charlestonensis (Pennell & Clokey) Clokey – not accepted
  Penstemon eriantherus var. redactus Pennell & D.D. Keck – accepted – longsac penstemon
  Penstemon menziesii ssp. thompsonii Pennell & D.D. Keck – not accepted
  Penstemon whitedii ssp. tristis Pennell & D.D. Keck – not accepted
  Pedicularis rainierensis Pennell & F.A. Warren – accepted – Mt. Rainier lousewort
  Castilleja cryptantha Pennell & G.N. Jones – accepted – obscure Indian paintbrush
  Penstemon alamosensis Pennell & G.T. Nisbet – accepted – Los Alamos beardtongue, Alamo beardtongue
  Pedicularis atrosanguinea Pennell & J.W. Thomp. – not accepted
  Pedicularis bracteosa var. atrosanguinea (Pennell & J.W. Thomp.) Cronquist – accepted – bracted lousewort
  Synthyris paysonii Pennell & L.O. Williams – not accepted
  Castilleja nivea Pennell & Ownbey – accepted – snow Indian paintbrush
  Castilleja villicaulis Pennell & Ownbey – not accepted
  Dodecatheon pulchellum ssp. superbum (Pennell & Stair) Hultén – not accepted
  Chelone chlorantha Pennell & Wherry – not accepted
  Chelone glabra var. elongata Pennell & Wherry – not accepted
  Chelone glabra var. ochroleuca Pennell & Wherry – not accepted
  Chelone obliqua var. erwiniae Pennell & Wherry – accepted – Erwin's red turtlehead
  Chelone obliqua var. speciosa Pennell & Wherry – accepted – red turtlehead
  Chelone glabra var. chlorantha (Pennell & Wherry) Cooperr. – not accepted
  Agalinis flava var. macrantha (Pennell) B. Boivin – not accepted
  Agalinis purpurea var. racemulosa (Pennell) B. Boivin – not accepted
  Castilleja pallida var. caudata (Pennell) B. Boivin – not accepted
  Scrophularia californica var. oregana (Pennell) B. Boivin – not accepted
  Veronica comosa var. glaberrima (Pennell) B. Boivin – not accepted
  Castilleja linariifolia var. omnipubescens (Pennell) Clokey – not accepted
  Gerardia grandiflora var. cinerea (Pennell) Cory – not accepted
  Penstemon guadalupensis var. ernstii (Pennell) Cory – not accepted
  Penstemon triflorus var. integrifolius (Pennell) Cory – accepted – Heller's beardtongue
  Cassia aristellata (Pennell) Cory ex Cory & H.B. Parks – not accepted
  Pedicularis bracteosa var. flavida (Pennell) Cronquist – accepted – towering lousewort
  Pedicularis bracteosa var. latifolia (Pennell) Cronquist – accepted – widepetal lousewort
  Pedicularis bracteosa var. pachyrhiza (Pennell) Cronquist – accepted – towering lousewort
  Pedicularis bracteosa var. paysoniana (Pennell) Cronquist – accepted – Payson's lousewort
  Pedicularis racemosa var. alba (Pennell) Cronquist – not accepted
  Penstemon attenuatus var. palustris (Pennell) Cronquist – accepted – sulphur beardtongue
  Penstemon nitidus var. polyphyllus (Pennell) Cronquist – accepted – waxleaf penstemon
  Penstemon procerus var. brachyanthus (Pennell) Cronquist – accepted – pincushion beardtongue
  Synthyris pinnatifida var. canescens (Pennell) Cronquist – not accepted – hairy kittentails
  Sairocarpus multiflorus (Pennell) D.A. Sutton – accepted – Sierra snapdragon
  Penstemon attenuatus ssp. palustris (Pennell) D.D. Keck – not accepted
  Penstemon crandallii ssp. glabrescens (Pennell) D.D. Keck – accepted – Crandall's beardtongue
  Penstemon crandallii ssp. glabrescens var. glabrescens (Pennell) D.D. Keck – not accepted – Crandall's beardtongue
  Penstemon humilis ssp. obtusifolius (Pennell) D.D. Keck – not accepted – low beardtongue
  Penstemon jamesii ssp. ophianthus (Pennell) D.D. Keck – not accepted
  Penstemon moffatii ssp. paysonii (Pennell) D.D. Keck – not accepted – Moffatt's beardtongue
  Penstemon procerus ssp. brachyanthus (Pennell) D.D. Keck – not accepted
  Penstemon rydbergii ssp. aggregatus (Pennell) D.D. Keck – not accepted
  Penstemon tolmiei ssp. brachyanthus (Pennell) D.D. Keck – not accepted
  Gerardia paupercula var. borealis (Pennell) Deam – not accepted
  Monarda punctata ssp. punctata var. villicaulis (Pennell) E.J. Palmer & Steyerm. – not accepted – spotted beebalm
  Monarda punctata var. villicaulis (Pennell) E.J. Palmer & Steyerm. – accepted – spotted beebalm
  Mabrya acerifolia (Pennell) Elisens – accepted – brittlestem
  Penstemon decurvus Pennell ex Crosswh. – not accepted
  Castilleja calcicola Pennell ex Edwin – not accepted
  Castilleja flavescens Pennell ex Edwin – not accepted
  Castilleja angustifolia var. flavescens (Pennell ex Edwin) N.H. Holmgren – accepted – northwestern Indian paintbrush, northwestern paintbrush
  Antirrhinum hookerianum Pennell ex Millsp. – not accepted
  Penstemon virens Pennell ex Rydb. – accepted – Front Range beardtongue
  Mimulus glabratus var. michiganensis (Pennell) Fassett – not accepted – Michigan monkey-flower, Michigan monkeyflower
  Penstemon gracilis var. wisconsinensis (Pennell) Fassett – not accepted – Wisconsin penstemon
  Gerardia flava var. macrantha (Pennell) Fernald – not accepted
  Gerardia grandiflora var. pulchra (Pennell) Fernald – not accepted
  Gerardia pedicularia var. austromontana (Pennell) Fernald – not accepted
  Gerardia pedicularia var. intercedens (Pennell) Fernald – not accepted
  Melampyrum lineare var. pectinatum (Pennell) Fernald – accepted – narrowleaf cowwheat
  Veronica connata var. glaberrima (Pennell) Fernald – not accepted
  Castilleja subinclusa var. franciscana (Pennell) G.L. Nesom – not accepted
  Gerardia purpurea var. racemulosa (Pennell) Gleason – not accepted
  Chamaecrista lineata var. keyensis (Pennell) H.S. Irwin & Barneby – accepted – narrowpod sensitive pea, Big Pine partridge pea
  Castilleja caudata var. auricoma (Pennell) Hultén – accepted – Port Clarence Indian paintbrush
  Asclepias longifolia ssp. hirtella (Pennell) J. Farmer & C.R. Bell – not accepted
  Asclepias longifolia var. hirtella (Pennell) J. Farmer & C.R. Bell – not accepted
  Cassia keyensis (Pennell) J.F. Macbr. – not accepted
  Cerastium velutinum var. villosissimum (Pennell) J.K. Morton – accepted – Octoraro Creek chickweed
  Synthyris missurica ssp. stellata (Pennell) Kartesz & Gandhi – accepted – western mountain kittentails
  Rhexia mariana var. interior (Pennell) Kral & Bostick – accepted – Maryland meadowbeauty
  Synthyris oblongifolia (Pennell) L. Hufford & M. McMahon – accepted – eggleaf kittentails
  Mimulus guttatus var. laxus (Pennell) M. Peck – not accepted
  Diplacus fasciculatus (Pennell) McMinn – accepted – Santa Lucia Mountain bush monkeyflower
  Castilleja wightii ssp. inflata (Pennell) Munz – not accepted
  Castilleja wightii ssp. litoralis (Pennell) Munz – not accepted
  Cordylanthus littoralis ssp. platycephalus (Pennell) Munz – not accepted
  Cordylanthus palmatus ssp. carnulosus (Pennell) Munz – not accepted
  Cordylanthus pilosus ssp. diffusus (Pennell) Munz – not accepted
  Oenothera sessilis (Pennell) Munz – not accepted
  Oenothera tetragona var. brevistipata (Pennell) Munz – not accepted
  Oenothera tetragona var. longistipata (Pennell) Munz – not accepted
  Oenothera tetragona var. velutina (Pennell) Munz – not accepted
  Castilleja martinii var. clokeyi (Pennell) N.H. Holmgren – not accepted
  Castilleja pilosa var. steenensis (Pennell) N.H. Holmgren – accepted – Steenes Indian paintbrush, Steen's mountain paintbrush
  Penstemon caespitosus var. perbrevis (Pennell) N.H. Holmgren – accepted – mat penstemon
  Penstemon rydbergii var. aggregatus (Pennell) N.H. Holmgren – accepted – meadow beardtongue, meadow penstemon
  Penstemon scariosus var. garrettii (Pennell) N.H. Holmgren – accepted – Garrett's beardtongue
  Penstemon cyananthus var. longiflorus (Pennell) Neese – not accepted
  Castilleja hispida var. acuta (Pennell) Ownbey – not accepted
  Castilleja parviflora var. albida (Pennell) Ownbey – accepted – smallflower Indian paintbrush
  Penstemon alpinus ssp. magnus (Pennell) Penland – not accepted
  Penstemon alpinus var. nagnus (Pennell) Penland – not accepted
  Agalinis pinetorum var. delicatula (Pennell) Pennell – not accepted
  Asarina acerifolia (Pennell) Pennell – not accepted
  Aureolaria grandiflora ssp. cinerea (Pennell) Pennell – not accepted
  Aureolaria grandiflora ssp. pulchra (Pennell) Pennell – not accepted
  Aureolaria pectinata ssp. eurycarpa (Pennell) Pennell – not accepted
  Aureolaria pectinata ssp. transcendens (Pennell) Pennell – not accepted
  Aureolaria pectinata var. floridana (Pennell) Pennell – not accepted
  Aureolaria pedicularia ssp. austromontana (Pennell) Pennell – not accepted
  Aureolaria pedicularia ssp. intercedens (Pennell) Pennell – not accepted
  Aureolaria pedicularia var. caesariensis (Pennell) Pennell – not accepted
  Aureolaria pedicularia var. carolinensis (Pennell) Pennell – not accepted
  Gerardia acuta (Pennell) Pennell – not accepted
  Gerardia caddoensis (Pennell) Pennell – not accepted
  Gerardia calycina (Pennell) Pennell – not accepted
  Gerardia edwardsiana (Pennell) Pennell – not accepted
  Gerardia edwardsiana ssp. glabra (Pennell) Pennell – not accepted
  Gerardia fasciculata ssp. peninsularis (Pennell) Pennell – not accepted
  Gerardia homalantha (Pennell) Pennell – not accepted
  Gerardia keyensis (Pennell) Pennell – not accepted
  Gerardia laxa (Pennell) Pennell – not accepted
  Gerardia paupercula ssp. borealis (Pennell) Pennell – not accepted
  Gerardia pseudaphylla (Pennell) Pennell – not accepted
  Gerardia pulchella var. delicatula (Pennell) Pennell – not accepted
  Gerardia purpurea var. carteri (Pennell) Pennell – not accepted
  Gerardia stenophylla (Pennell) Pennell – not accepted
  Gerardia tenella (Pennell) Pennell – not accepted
  Lindernia dubia var. inundata (Pennell) Pennell – not accepted – false pimpernel, lindernie litigieuse variété estuarienne, yellowseed false pimpernel
  Penstemon canescens var. brittoniorum (Pennell) Pennell – not accepted
  Penstemon cobaea ssp. purpureus (Pennell) Pennell – not accepted
  Penstemon gracilis ssp. wisconsinensis (Pennell) Pennell – not accepted
  Seymeria harvardii (Pennell) Pennell – not accepted
  Seymeria pectinata ssp. peninsularis (Pennell) Pennell – accepted – piedmont blacksenna
  Tragiola pilosa ssp. epilis (Pennell) Pennell – not accepted
  Mimulus michiganensis (Pennell) Posto & Prather – accepted – Michigan monkeyflower, Michigan monkey-flower
  Penstemon X jonesii Pennell (pro. sp.) – accepted – Jones' penstemon
  Penstemon australis ssp. laxiflorus (Pennell) R.W. Benn. – not accepted – Eustis Lake beardtongue
  Penstemon laevigatus ssp. alluviorum (Pennell) R.W. Benn. – not accepted
  Penstemon laevigatus ssp. deamii (Pennell) R.W. Benn. – not accepted
  Penstemon laevigatus var. deamii (Pennell) R.W. Benn. – not accepted
  Penstemon pallidus ssp. arkansanus (Pennell) R.W. Benn. – not accepted
  Castilleja caudata (Pennell) Rebrist. – accepted – Port Clarence Indian paintbrush
  Castilleja caudata var. caudata (Pennell) Rebrist. – accepted – Port Clarence Indian paintbrush
  Penstemon humilis var. obtusifolius (Pennell) Reveal – accepted – low beardtongue
  Schwalbea americana var. australis (Pennell) Reveal & C.R. Broome – not accepted
  Agalinis pedicularia var. caesariensis (Pennell) S.F. Blake – not accepted
  Penstemon longiflorus (Pennell) S.L. Clark – accepted – longflower penstemon
  Monarda punctata var. immaculata (Pennell) Scora – accepted
  Agalinis pseudaphylla (Pennell) Shinners – not accepted
  Castilleja purpurea var. citrina (Pennell) Shinners – accepted – prairie Indian paintbrush, citron paintbrush
  Nemexia leptanthera (Pennell) Small – not accepted
  Seymeria havardii (Pennell) Standl. – not accepted
  Oenothera pilosella ssp. sessilis (Pennell) Straley – accepted – meadow evening primrose, meadow evening-primrose, meadow eveningprimrose
  Oenothera pilosella var. sellilis (Pennell) Straley – not accepted
  Castilleja affinis ssp. litoralis (Pennell) T.I. Chuang & Heckard – accepted – coast Indian paintbrush
  Castilleja subinclusa ssp. franciscana (Pennell) T.I. Chuang & Heckard – accepted – longleaf Indian paintbrush
  Cordylanthus mollis ssp. hispidus (Pennell) T.I. Chuang & Heckard – not accepted – hispid bird's-beak
  Cordylanthus tenuis ssp. capillaris (Pennell) T.I. Chuang & Heckard – accepted – Pennell's bird's-beak, Pennell's bird's beak
  Cordylanthus tenuis ssp. pallescens (Pennell) T.I. Chuang & Heckard – accepted – pallid bird's-beak
  Cordylanthus wrightii ssp. tenuifolius (Pennell) T.I. Chuang & Heckard – accepted – Wright's bird's-beak, Wright's bird's beak
  Chloropyron molle ssp. hispidum (Pennell) Tank & J.M. Egger – accepted – hispid bird's-beak
  Pedicularis bracteosa ssp. paysoniana (Pennell) W.A. Weber – not accepted
  Asclepias hirtella (Pennell) Woodson – accepted – green milkweed, tall-green milkweed, prairie milkweed
  Penstemon globosus (Piper) Pennell & D.D. Keck – accepted – globe penstemon
  Synthyris lanuginosa (Piper) Pennell & J.W. Thomp. – accepted – featherleaf kittentails
  Bacopa egensis (Poepp.) Pennell – accepted – Brazilian waterhyssop
  Lindernia dubia var. major (Pursh) Pennell – not accepted
  Pedicularis langsdorffii ssp. arctica (R. Br.) Pennell – accepted – arctic lousewort
  Pedicularis langsdorfii ssp. arctica (R. Br.) Pennell – not accepted – arctic lousewort
  Agalinis tenuifolia ssp. leucanthera (Raf.) Pennell – not accepted
  Agalinis tenuifolia var. leucanthera (Raf.) Pennell – not accepted – slenderleaf false foxglove
  Aureolaria flava ssp. reticulata (Raf.) Pennell – not accepted
  Aureolaria flava var. reticulata (Raf.) Pennell – not accepted
  Besseya cinerea (Raf.) Pennell – not accepted
  Dasystephana tenuifolia (Raf.) Pennell – not accepted
  Gerardia obtusifolia (Raf.) Pennell – not accepted
  Gerardia tenuifolia ssp. leucanthera (Raf.) Pennell – not accepted
  Mecardonia acuminata var. microphylla (Raf.) Pennell – accepted – axilflower
  Synthyris missurica (Raf.) Pennell – accepted – tailed kittentails
  Synthyris missurica ssp. missurica (Raf.) Pennell – accepted – tailed kittentails
  Chelone montana (Raf.) Pennell & Wherry – not accepted
  Melasma melampyroides (Rich.) Pennell – not accepted
  Kneiffia tetragona (Roth) Pennell – not accepted
  Linaria canadensis var. texana (Scheele) Pennell – not accepted
  Chamaecrista deeringiana Small & Pennell – accepted – Florida Keys sensitive pea
  Cassia deeringiana (Small & Pennell) J.F. Macbr. – not accepted
  Smilax biltmoreana (Small) J.B. Norton ex Pennell – accepted – Biltmore's carrionflower
  Smilax hugeri (Small) J.B. Norton ex Pennell – accepted – Huger's carrionflower
  Agalinis tenuifolia var. polyphylla (Small) Pennell – not accepted – slenderleaf false foxglove
  Agalinis viridis (Small) Pennell – accepted – green false foxglove
  Aureolaria dispersa (Small) Pennell – not accepted
  Gerardia tenuifolia ssp. polyphylla (Small) Pennell – not accepted
  Rhinanthus arcticus (Sterneck) Pennell – not accepted
  Penstemon deustus ssp. variabilis (Suksd.) Pennell & D.D. Keck – not accepted
  Macuillamia repens (Sw.) Pennell – not accepted
  Mecardonia dianthera (Sw.) Pennell – not accepted
  Penstemon deustus ssp. heterander (Torr. & A. Gray) Pennell & D.D. Keck – not accepted
  Aureolaria grandiflora ssp. serrata (Torr. ex Benth.) Pennell – not accepted
  Aureolaria grandiflora var. serrata (Torr. ex Benth.) Pennell – not accepted – largeflower yellow false foxglove
  Macranthera flammea (W. Bartram) Pennell – accepted – flameflower
  Ilysanthes inequalis (Walter) Pennell – not accepted
  Pagesia acuminata (Walter) Pennell – not accepted
   

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