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Classification
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Classification for Kingdom Plantae Down to Genus Penstemon Schmidel

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Up to the Kingdom
Kingdom  Plantae – Plants
Subkingdom  Tracheobionta – Vascular plants
Superdivision  Spermatophyta – Seed plants
Division  Magnoliophyta – Flowering plants
Class  Magnoliopsida – Dicotyledons
Subclass  Asteridae
Order  Scrophulariales
Family  Scrophulariaceae – Figwort family
Genus  Penstemon Schmidel – beardtongue P
 
Contains 249 Species and 388 accepted taxa overall
 
Down one level
 
Species  Penstemon abietinus Pennell – firleaf beardtongue P
Species  Penstemon absarokensis Evert – Absaroka Range beardtongue P
Species  Penstemon acaulis L.O. Williams – stemless beardtongue P
Species  Penstemon acuminatus Douglas ex Lindl. – sharpleaf penstemon P
Variety  Penstemon acuminatus Douglas ex Lindl. var. acuminatus – sharpleaf penstemon P
Variety  Penstemon acuminatus Douglas ex Lindl. var. latebracteatus N.H. Holmgren – sharpleaf penstemon P
Species  Penstemon alamosensis Pennell & Nisbet – Los Alamos beardtongue P
Species  Penstemon albertinus Greene – Alberta beardtongue P
Species  Penstemon albidus Nutt. – white penstemon P
Species  Penstemon albomarginatus M.E. Jones – whitemargin beardtongue P
Species  Penstemon alluviorum Pennell – lowland beardtongue P
Species  Penstemon ambiguus Torr. – gilia beardtongue P
Variety  Penstemon ambiguus Torr. var. ambiguus – gilia beardtongue P
Variety  Penstemon ambiguus Torr. var. laevissimus (D.D. Keck) N.H. Holmgren – pink plains beardtongue P
Species  Penstemon ammophilus N.H. Holmgren & L.M. Shultz – sandloving penstemon P
Species  Penstemon anguineus Eastw. – Siskiyou beardtongue P
Species  Penstemon angustifolius Nutt. ex Pursh – broadbeard beardtongue P
Variety  Penstemon angustifolius Nutt. ex Pursh var. angustifolius – broadbeard beardtongue P
Variety  Penstemon angustifolius Nutt. ex Pursh var. caudatus (A. Heller) Rydb. – broadbeard beardtongue P
Variety  Penstemon angustifolius Nutt. ex Pursh var. dulcis Neese – broadbeard beardtongue P
Variety  Penstemon angustifolius Nutt. ex Pursh var. venosus (D.D. Keck) N.H. Holmgren – broadbeard beardtongue P
Variety  Penstemon angustifolius Nutt. ex Pursh var. vernalensis N.H. Holmgren – broadbeard beardtongue P
Species  Penstemon arenarius Greene – Nevada sanddune beardtongue P
Species  Penstemon arenicola A. Nelson – sand penstemon P
Species  Penstemon aridus Rydb. – stiffleaf penstemon P
Species  Penstemon arkansanus Pennell – Arkansas beardtongue P
Species  Penstemon attenuatus Douglas ex Lindl. – sulphur penstemon P
Variety  Penstemon attenuatus Douglas ex Lindl. var. attenuatus – sulphur penstemon P
Variety  Penstemon attenuatus Douglas ex Lindl. var. militaris (Greene) Cronquist – South Idaho penstemon P
Variety  Penstemon attenuatus Douglas ex Lindl. var. palustris (Pennell) Cronquist – sulphur beardtongue P
Variety  Penstemon attenuatus Douglas ex Lindl. var. pseudoprocerus (Rydb.) Cronquist – small penstemon P
Species  Penstemon atwoodii S.L. Welsh – Kaiparowits beardtongue P
Species  Penstemon auriberbis Pennell – Colorado beardtongue P
Species  Penstemon australis Small – Eustis Lake beardtongue P
Species  Penstemon azureus Benth. – azure penstemon P
Subspecies  Penstemon azureus Benth. ssp. angustissimus (A. Gray) D.D. Keck – azure penstemon P
Subspecies  Penstemon azureus Benth. ssp. azureus – azure penstemon P
Species  Penstemon baccharifolius Hook. – baccharisleaf beardtongue P
Species  Penstemon barbatus (Cav.) Roth – beardlip penstemon P
Subspecies  Penstemon barbatus (Cav.) Roth ssp. barbatus – beardlip penstemon P
Subspecies  Penstemon barbatus (Cav.) Roth ssp. torreyi (Benth.) D.D. Keck – Torrey's penstemon P
Subspecies  Penstemon barbatus (Cav.) Roth ssp. trichander (A. Gray) D.D. Keck – beardlip penstemon P
Species  Penstemon barnebyi N.H. Holmgren – White River Valley beardtongue P
Species  Penstemon barrettiae A. Gray – Barrett's beardtongue P
Species  Penstemon bicolor (Brandegee) Clokey & D.D. Keck – pinto beardtongue P
Subspecies  Penstemon bicolor (Brandegee) Clokey & D.D. Keck ssp. bicolor – pinto beardtongue P
Subspecies  Penstemon bicolor (Brandegee) Clokey & D.D. Keck ssp. roseus Clokey & D.D. Keck – pinto beardtongue P
Species  Penstemon bracteatus D.D. Keck – Red Canyon beardtongue P
Species  Penstemon breviculus (D.D. Keck) Nisbet & R.C. Jacks. – shortstem beardtongue P
Species  Penstemon bryantiae D.D. Keck – Bryant's beardtongue P
Species  Penstemon buckleyi Pennell – Buckley's beardtongue P
Species  Penstemon caesius A. Gray – San Bernardino beardtongue P
Species  Penstemon caespitosus Nutt. ex A. Gray – mat penstemon P
Variety  Penstemon caespitosus Nutt. ex A. Gray var. caespitosus – mat penstemon P
Variety  Penstemon caespitosus Nutt. ex A. Gray var. desertipicti (A. Nelson) N.H. Holmgren – mat penstemon P
Variety  Penstemon caespitosus Nutt. ex A. Gray var. perbrevis (Pennell) N.H. Holmgren – mat penstemon P
Species  Penstemon calcareus Brandegee – limestone beardtongue P
Species  Penstemon californicus (Munz & I.M. Johnst.) D.D. Keck – California penstemon P
Species  Penstemon calycosus Small – longsepal beardtongue P
Species  Penstemon campanulatus (Cav.) Willd. [excluded] – bellflower beardtongue P
Subspecies  Penstemon campanulatus (Cav.) Willd. ssp. chihuahuensis Straw [excluded] P
Species  Penstemon canescens (Britton) Britton – eastern gray beardtongue P
Species  Penstemon cardinalis Woot. & Standl. – cardinal beardtongue P
Subspecies  Penstemon cardinalis Woot. & Standl. ssp. cardinalis – cardinal beardtongue P
Subspecies  Penstemon cardinalis Woot. & Standl. ssp. regalis (A. Nelson) Nisbet & R.C. Jacks. – cardinal beardtongue P
Species  Penstemon cardwellii Howell – Cardwell's beardtongue P
Species  Penstemon carnosus Pennell – fleshy beardtongue P
Species  Penstemon caryi Pennell – Cary's beardtongue P
Species  Penstemon centranthifolius (Benth.) Benth. – scarlet bugler P
Species  Penstemon cinicola D.D. Keck – ash penstemon P
Species  Penstemon clevelandii A. Gray – Cleveland's beardtongue P
Subspecies  Penstemon clevelandii A. Gray ssp. clevelandii – Cleveland's beardtongue P
Subspecies  Penstemon clevelandii A. Gray ssp. connatus (Munz & I.M. Johnst.) D.D. Keck – San Jacinto beardtongue P
Subspecies  Penstemon clevelandii A. Gray ssp. mohavensis D.D. Keck – Cleveland's beardtongue P
Species  Penstemon clutei A. Nelson – Sunset Crater beardtongue P
Species  Penstemon cobaea Nutt. – cobaea beardtongue P
Species  Penstemon comarrhenus A. Gray – dusty beardtongue P
Species  Penstemon compactus (D.D. Keck) Crosswh. – compact penstemon P
Species  Penstemon concinnus D.D. Keck – Tunnel Springs beardtongue P
Species  Penstemon confertus Douglas ex Lindl. – yellow penstemon P
Species  Penstemon confusus M.E. Jones – Owens Valley beardtongue P
Species  Penstemon crandallii A. Nelson – Crandall's beardtongue P
Subspecies  Penstemon crandallii A. Nelson ssp. atratus D.D. Keck – Crandall's beardtongue P
Subspecies  Penstemon crandallii A. Nelson ssp. crandallii – Crandall's beardtongue P
Subspecies  Penstemon crandallii A. Nelson ssp. glabrescens (Pennell) D.D. Keck – Crandall's beardtongue P
Subspecies  Penstemon crandallii A. Nelson ssp. procumbens (Greene) D.D. Keck – Crandall's beardtongue P
Subspecies  Penstemon crandallii A. Nelson ssp. taosensis (D.D. Keck) Kartesz & Gandhi – Taos penstemon P
Species  Penstemon ×crideri A. Nelson (pro sp.) P
Species  Penstemon cusickii A. Gray – Cusick's beardtongue P
Species  Penstemon cyananthus Hook. – Wasatch beardtongue P
Variety  Penstemon cyananthus Hook. var. cyananthus – Wasatch beardtongue P
Variety  Penstemon cyananthus Hook. var. subglaber (A. Gray) N.H. Holmgren – Wasatch beardtongue P
Species  Penstemon cyaneus Pennell – blue penstemon P
Species  Penstemon cyanocaulis Payson – bluestem beardtongue P
Species  Penstemon cyathophorus Rydb. – sagebrush beardtongue P
Species  Penstemon dasyphyllus A. Gray – Cochise beardtongue P
Species  Penstemon davidsonii Greene – Davidson's penstemon P
Variety  Penstemon davidsonii Greene var. davidsonii – Davidson's penstemon P
Variety  Penstemon davidsonii Greene var. menziesii (D.D. Keck) Cronquist – Menzies' penstemon P
Variety  Penstemon davidsonii Greene var. praeteritus Cronquist – timberline beardtongue P
Species  Penstemon deamii Pennell – Deam's beardtongue P
Species  Penstemon deaveri Crosswh. – Mt. Graham beardtongue P
Species  Penstemon debilis O'Kane & J.L. Anderson – Parachute beardtongue P
Species  Penstemon degeneri Crosswh. – Degener's beardtongue P
Species  Penstemon deustus Douglas ex Lindl. – scabland penstemon P
Variety  Penstemon deustus Douglas ex Lindl. var. deustus – scabland penstemon P
Variety  Penstemon deustus Douglas ex Lindl. var. pedicellatus M.E. Jones – scabland penstemon P
Variety  Penstemon deustus Douglas ex Lindl. var. suffrutescens L.F. Hend. – scabland penstemon P
Variety  Penstemon deustus Douglas ex Lindl. var. variabilis (Suksd.) Cronquist – scabland penstemon P
Species  Penstemon digitalis Nutt. ex Sims – talus slope penstemon P
Species  Penstemon diphyllus Rydb. – twoleaf beardtongue P
Species  Penstemon discolor D.D. Keck – Cataiina beardtongue P
Species  Penstemon dissectus Elliot – dissected beardtongue P
Species  Penstemon distans N.H. Holmgren – Mt. Tumbull beardtongue P
Species  Penstemon dolius M.E. Jones ex Pennell – Jones' beardtongue P
Variety  Penstemon dolius M.E. Jones ex Pennell var. dolius – Jones' beardtongue P
Variety  Penstemon dolius M.E. Jones ex Pennell var. duchesnensis N.H. Holmgren – Duchesne penstemon P
Species  Penstemon ×dubius Davidson (pro sp.) P
Species  Penstemon eatonii A. Gray – firecracker penstemon P
Subspecies  Penstemon eatonii A. Gray ssp. eatonii – firecracker penstemon P
Subspecies  Penstemon eatonii A. Gray ssp. exsertus (A. Nelson) D.D. Keck – firecracker penstemon P
Subspecies  Penstemon eatonii A. Gray ssp. undosus (M.E. Jones) D.D. Keck – firecracker penstemon P
Species  Penstemon elegantulus Pennell – rockvine penstemon P
Species  Penstemon ellipticus J.M. Coult. & Fisher – rocky ledge penstemon P
Species  Penstemon eriantherus Pursh – fuzzytongue penstemon P
Variety  Penstemon eriantherus Pursh var. argillosus M.E. Jones – fuzzytongue penstemon P
Variety  Penstemon eriantherus Pursh var. cleburnei (M.E. Jones) Dorn – Cleburn's penstemon P
Variety  Penstemon eriantherus Pursh var. eriantherus – fuzzytongue penstemon P
Variety  Penstemon eriantherus Pursh var. redactus Pennell & D.D. Keck – longsac penstemon P
Variety  Penstemon eriantherus Pursh var. whitedii (Piper) A. Nelson – Whited's penstemon P
Species  Penstemon euglaucus English – glaucous beardtongue P
Species  Penstemon fendleri Torr. & A. Gray – Fendler's penstemon P
Species  Penstemon filiformis (D.D. Keck) D.D. Keck – threadleaf beardtongue P
Species  Penstemon flavescens Pennell – high mountain penstemon P
Species  Penstemon floribundus D. Danley – Cordillia's beardtongue P
Species  Penstemon floridus Brandegee – Panamint beardtongue P
Variety  Penstemon floridus Brandegee var. austinii (Eastw.) N.H. Holmgren – Austin's beardtongue P
Variety  Penstemon floridus Brandegee var. floridus – Panamint beardtongue P
Species  Penstemon flowersii Neese & S.L. Welsh – Flowers' beardtongue P
Species  Penstemon franklinii S.L. Welsh – Franklin's penstemon P
Species  Penstemon fremontii Torr. & A. Gray ex A. Gray – Fremont's beardtongue P
Variety  Penstemon fremontii Torr. & A. Gray ex A. Gray var. fremontii – Fremont's beardtongue P
Variety  Penstemon fremontii Torr. & A. Gray ex A. Gray var. glabrescens Dorn & Lichvar – Fremont's beardtongue P
Species  Penstemon fruticiformis Coville – Death Valley beardtongue P
Subspecies  Penstemon fruticiformis Coville ssp. amargosae D.D. Keck – Death Valley beardtongue P
Subspecies  Penstemon fruticiformis Coville ssp. fruticiformis – Death Valley beardtongue P
Species  Penstemon fruticosus (Pursh) Greene – bush penstemon P
Variety  Penstemon fruticosus (Pursh) Greene var. fruticosus – bush penstemon P
Variety  Penstemon fruticosus (Pursh) Greene var. scouleri (Lindl.) Cronquist – littleleaf bush penstemon P
Variety  Penstemon fruticosus (Pursh) Greene var. serratus (D.D. Keck) Cronquist – sawleaf bush penstemon P
Species  Penstemon gairdneri Hook. – Gairdner's beardtongue P
Variety  Penstemon gairdneri Hook. var. gairdneri – Gairdner's beardtongue P
Variety  Penstemon gairdneri Hook. var. oreganus A. Gray – Gairdner's beardtongue P
Species  Penstemon gentianoides (Kunth) Poir. – gentian beardtongue P
Species  Penstemon gibbensii Dorn – Gibbens' beardtongue P
Species  Penstemon glaber Pursh – sawsepal penstemon P
Variety  Penstemon glaber Pursh var. alpinus (Torr.) A. Gray – alpine sawsepal penstemon P
Variety  Penstemon glaber Pursh var. brandegeei (Porter) Freeman – Brandegee's penstemon P
Variety  Penstemon glaber Pursh var. glaber – sawsepal penstemon P
Species  Penstemon glandulosus Douglas – stickystem penstemon P
Variety  Penstemon glandulosus Douglas var. chelanensis (D.D. Keck) Cronquist – stickystem penstemon P
Variety  Penstemon glandulosus Douglas var. glandulosus – stickystem penstemon P
Species  Penstemon glaucinus Pennell – blueleaf beardtongue P
Species  Penstemon globosus (Piper) Pennell & D.D. Keck – globe penstemon P
Species  Penstemon goodrichii N.H. Holmgren – Lapoint beardtongue P
Species  Penstemon gormanii Greene – Gorman's beardtongue P
Species  Penstemon gracilentus A. Gray – slender penstemon P
Species  Penstemon gracilis Nutt. – lilac penstemon P
Variety  Penstemon gracilis Nutt. var. gracilis – lilac penstemon P
Variety  Penstemon gracilis Nutt. var. wisconsinensis (Pennell) Fassett – Wisconsin penstemon P
Species  Penstemon grahamii D.D. Keck – Uinta Basin beardtongue P
Species  Penstemon grandiflorus Nutt. – large beardtongue P
Species  Penstemon griffinii A. Nelson – Griffin's beardtongue P
Species  Penstemon grinnellii Eastw. – Grinnell's beardtongue P
Subspecies  Penstemon grinnellii Eastw. ssp. grinnellii – Grinnell's beardtongue P
Subspecies  Penstemon grinnellii Eastw. ssp. scrophularioides (M.E. Jones) Munz – Grinnell's beardtongue P
Species  Penstemon guadalupensis A. Heller – Guadalupe beardtongue P
Species  Penstemon hallii A. Gray – Hall's beardtongue P
Species  Penstemon harbourii A. Gray – Harbour's beardtongue P
Species  Penstemon harringtonii Penl. – Harrington's beardtongue P
Species  Penstemon hartwegii Benth. – Hartweg's beardtongue P
Species  Penstemon havardii A. Gray – Big Bend beardtongue P
Species  Penstemon haydenii S. Watson – blowout beardtongue P
Species  Penstemon heterodoxus A. Gray – Sierra beardtongue P
Variety  Penstemon heterodoxus A. Gray var. cephalophorus (Greene) N.H. Holmgren – Sierra beardtongue P
Variety  Penstemon heterodoxus A. Gray var. heterodoxus – Sierra beardtongue P
Variety  Penstemon heterodoxus A. Gray var. shastensis (D.D. Keck) N.H. Holmgren – Shasta beardtongue P
Species  Penstemon heterophyllus Lindl. – bunchleaf penstemon P
Subspecies  Penstemon heterophyllus Lindl. ssp. australis (Munz & I.M. Johnst.) D.D. Keck – foothill beardtongue P
Subspecies  Penstemon heterophyllus Lindl. ssp. heterophyllus – bunchleaf penstemon P
Subspecies  Penstemon heterophyllus Lindl. ssp. purdyi D.D. Keck – Purdy's penstemon P
Species  Penstemon hirsutus (L.) Willd. – hairy beardtongue P
Species  Penstemon humilis Nutt. ex A. Gray – low beardtongue P
Subspecies  Penstemon humilis Nutt. ex A. Gray ssp. brevifolius (A. Gray) D.D. Keck – low beardtongue P
Subspecies  Penstemon humilis Nutt. ex A. Gray ssp. humilis – low beardtongue P
Subspecies  Penstemon humilis Nutt. ex A. Gray ssp. obtusifolius (Pennell) D.D. Keck – low beardtongue P
Species  Penstemon idahoensis N.D. Atwood & S.L. Welsh – Idaho beardtongue P
Species  Penstemon immanifestus N.H. Holmgren – Steptoe Valley beardtongue P
Species  Penstemon incertus Brandegee – Mojave beardtongue P
Species  Penstemon inflatus Crosswh. – inflated beardtongue P
Species  Penstemon jamesii Benth. – James' beardtongue P
Species  Penstemon janishiae N.H. Holmgren – Antelope Valley beardtongue P
Species  Penstemon ×jonesii Pennell (pro sp.) P
Species  Penstemon kingii S. Watson – King's beardtongue P
Species  Penstemon labrosus (A. Gray) Hook. f. – San Gabriel beardtongue P
Species  Penstemon laetus A. Gray – mountain blue penstemon P
Subspecies  Penstemon laetus A. Gray ssp. laetus – mountain blue penstemon P
Subspecies  Penstemon laetus A. Gray ssp. leptosepalus (Greene ex A. Gray) D.D. Keck – mountain blue penstemon P
Subspecies  Penstemon laetus A. Gray ssp. sagittatus D.D. Keck – mountain blue penstemon P
Species  Penstemon laevigatus Aiton – eastern smooth beardtongue P
Species  Penstemon laevis Pennell – southwestern beardtongue P
Species  Penstemon laricifolius Hook. & Arn. – larchleaf beardtongue P
Subspecies  Penstemon laricifolius Hook. & Arn. ssp. exilifolius (A. Nelson) D.D. Keck – larchleaf beardtongue P
Subspecies  Penstemon laricifolius Hook. & Arn. ssp. laricifolius – larchleaf beardtongue P
Species  Penstemon laxiflorus Pennell – nodding beardtongue P
Species  Penstemon laxus A. Nelson – tufted penstemon P
Species  Penstemon leiophyllus Pennell – smoothleaf beardtongue P
Variety  Penstemon leiophyllus Pennell var. francisci-pennellii (Crosswh.) N.H. Holmgren – smoothleaf beardtongue P
Variety  Penstemon leiophyllus Pennell var. keckii (Clokey) N.H. Holmgren – Keck's beardtongue P
Variety  Penstemon leiophyllus Pennell var. leiophyllus – smoothleaf beardtongue P
Species  Penstemon lemhiensis (D.D. Keck) D.D. Keck & Cronquist – Lemhi penstemon P
Species  Penstemon lentus Pennell – handsome beardtongue P
Variety  Penstemon lentus Pennell var. albiflorus (D.D. Keck) Reveal – handsome beardtongue P
Variety  Penstemon lentus Pennell var. lentus – handsome beardtongue P
Species  Penstemon leonardii Rydb. – Leonard's beardtongue P
Variety  Penstemon leonardii Rydb. var. higginsii Neese – Higgins' beardtongue P
Variety  Penstemon leonardii Rydb. var. leonardii – Leonard's beardtongue P
Variety  Penstemon leonardii Rydb. var. patricus (N.H. Holmgren) Neese – Leonard's beardtongue P
Species  Penstemon leptanthus Pennell – Sevier Plateau beardtongue P
Species  Penstemon linarioides A. Gray – toadflax penstemon P
Subspecies  Penstemon linarioides A. Gray ssp. coloradoensis (A. Nelson) D.D. Keck – toadflax penstemon P
Subspecies  Penstemon linarioides A. Gray ssp. compactifolius D.D. Keck – toadflax beardtongue P
Subspecies  Penstemon linarioides A. Gray ssp. linarioides – toadflax beardtongue P
Subspecies  Penstemon linarioides A. Gray ssp. maguirei D.D. Keck – Maguire's penstemon P
Subspecies  Penstemon linarioides A. Gray ssp. sileri (A. Gray) D.D. Keck – Siler's penstemon P
Species  Penstemon longiflorus (Pennell) S.L. Clark – longflower penstemon P
Species  Penstemon lyallii (A. Gray) A. Gray – Lyall's beardtongue P
Species  Penstemon marcusii (D.D. Keck) N.H. Holmgren – Marcus' beardtongue P
Species  Penstemon mensarum Pennell – tiger beardtongue P
Species  Penstemon metcalfei Woot. & Standl. – Metcalfe's beardtongue P
Species  Penstemon ×mirus A. Nelson (pro sp.) P
Species  Penstemon miser A. Gray – Malheur penstemon P
Species  Penstemon moffatii Eastw. – Moffatt's beardtongue P
Subspecies  Penstemon moffatii Eastw. ssp. moffatii – Moffatt's beardtongue P
Subspecies  Penstemon moffatii Eastw. ssp. paysonii (Pennell) D.D. Keck – Moffatt's beardtongue P
Species  Penstemon monoensis A. Heller – Mono penstemon P
Species  Penstemon montanus Greene – cordroot beardtongue P
Variety  Penstemon montanus Greene var. idahoensis (Pennell & D.D. Keck) Cronquist – Central Idaho penstemon P
Variety  Penstemon montanus Greene var. montanus – cordroot beardtongue P
Species  Penstemon moriahensis N.H. Holmgren – Mt. Moriah beardtongue P
Species  Penstemon multiflorus Chapm. ex Benth. – manyflower beardtongue P
Species  Penstemon murrayanus Hook. – scarlet beardtongue P
Species  Penstemon nanus D.D. Keck – dwarf beardtongue P
Species  Penstemon navajoa N.H. Holmgren – Navajo Mountain beardtongue P
Species  Penstemon neomexicanus Woot. & Standl. – New Mexico beardtongue P
Species  Penstemon neotericus D.D. Keck – Plumas County beardtongue P
Species  Penstemon newberryi A. Gray – mountain pride P
Subspecies  Penstemon newberryi A. Gray ssp. berryi (Eastw.) D.D. Keck – Berry's penstemon P
Subspecies  Penstemon newberryi A. Gray ssp. newberryi – mountain pride P
Subspecies  Penstemon newberryi A. Gray ssp. sonomensis (Greene) D.D. Keck – Sonoma penstemon P
Species  Penstemon nitidus Douglas ex Benth. – waxleaf penstemon P
Variety  Penstemon nitidus Douglas ex Benth. var. nitidus – waxleaf penstemon P
Variety  Penstemon nitidus Douglas ex Benth. var. polyphyllus (Pennell) Cronquist – waxleaf penstemon P
Species  Penstemon nudiflorus A. Gray – Flagstaff beardtongue P
Species  Penstemon oklahomensis Pennell – Oklahoma beardtongue P
Species  Penstemon oliganthus Woot. & Standl. – Apache beardtongue P
Species  Penstemon ophianthus Pennell – coiled anther penstemon P
Species  Penstemon osterhoutii Pennell – Osterhout's beardtongue P
Species  Penstemon ovatus Douglas ex Hook. – eggleaf beardtongue P
Species  Penstemon pachyphyllus A. Gray ex Rydb. – thickleaf beardtongue P
Variety  Penstemon pachyphyllus A. Gray ex Rydb. var. congestus (M.E. Jones) N.H. Holmgren – thickleaf beardtongue P
Variety  Penstemon pachyphyllus A. Gray ex Rydb. var. mucronatus (N.H. Holmgren) Neese – mucronate penstemon P
Variety  Penstemon pachyphyllus A. Gray ex Rydb. var. pachyphyllus – thickleaf beardtongue P
Species  Penstemon pahutensis N.H. Holmgren – Paiute beardtongue P
Species  Penstemon pallidus Small – pale beardtongue P
Species  Penstemon palmeri A. Gray – Palmer's penstemon P
Variety  Penstemon palmeri A. Gray var. eglandulosus (D.D. Keck) N.H. Holmgren – scented beardtongue P
Variety  Penstemon palmeri A. Gray var. macranthus (Eastw.) N.H. Holmgren – scented beardtongue P
Variety  Penstemon palmeri A. Gray var. palmeri – Palmer's penstemon P
Species  Penstemon papillatus J.T. Howell – Inyo beardtongue P
Species  Penstemon ×parishii A. Gray (pro sp.) P
Species  Penstemon parryi (A. Gray) A. Gray – Parry's beardtongue P
Species  Penstemon parviflorus Pennell – Montezuma County beardtongue P
Species  Penstemon parvus Pennell – Aquarius Plateau beardtongue P
Species  Penstemon patens (M.E. Jones) N.H. Holmgren – Lone Pine beardtongue P
Species  Penstemon payettensis A. Nelson & J.F. Macbr. – Payette beardtongue P
Species  Penstemon paysoniorum D.D. Keck – Payson's beardtongue P
Species  Penstemon peckii Pennell – Peck's beardtongue P
Species  Penstemon ×peirsonii Munz & I.M. Johnst. (pro sp.) P
Species  Penstemon penlandii W.A. Weber – Penland's beardtongue P
Species  Penstemon pennellianus D.D. Keck – Blue Mountain beardtongue P
Species  Penstemon perpulcher A. Nelson – Minidoka beardtongue P
Species  Penstemon personatus D.D. Keck – closethroat beardtongue P
Species  Penstemon petiolatus Brandegee – petiolate beardtongue P
Species  Penstemon pinifolius Greene – pineneedle beardtongue P
Species  Penstemon pinorum L.M. Shultz & J.S. Shultz – Pine Valley penstemon P
Species  Penstemon platyphyllus Rydb. – broadleaf beardtongue P
Species  Penstemon pratensis Greene – western whiteflower beardtongue P
Species  Penstemon procerus Douglas ex Graham – littleflower penstemon P
Variety  Penstemon procerus Douglas ex Graham var. aberrans (M.E. Jones) A. Nelson – pincushion beardtongue P
Variety  Penstemon procerus Douglas ex Graham var. brachyanthus (Pennell) Cronquist – pincushion beardtongue P
Variety  Penstemon procerus Douglas ex Graham var. formosus (A. Nelson) Cronquist – pincushion beardtongue P
Variety  Penstemon procerus Douglas ex Graham var. modestus (Greene) N.H. Holmgren – pincushion beardtongue P
Variety  Penstemon procerus Douglas ex Graham var. procerus – pincushion beardtongue P
Variety  Penstemon procerus Douglas ex Graham var. tolmiei (Hook.) Cronquist – Tolmie's penstemon P
Species  Penstemon pruinosus Douglas ex Lindl. – Chelan beardtongue P
Species  Penstemon pseudoparvus Crosswh. – Mt. Washington beardtongue P
Species  Penstemon pseudoputus (Crosswh.) N.H. Holmgren – Kaibab Plateau beardtongue P
Species  Penstemon pseudospectabilis M.E. Jones – desert penstemon P
Subspecies  Penstemon pseudospectabilis M.E. Jones ssp. connatifolius (A. Nelson) D.D. Keck – desert beardtongue P
Subspecies  Penstemon pseudospectabilis M.E. Jones ssp. pseudospectabilis – desert beardtongue P
Species  Penstemon pudicus Reveal & Beatley – Kawich Range beardtongue P
Species  Penstemon pumilus Nutt. – Salmon River beardtongue P
Species  Penstemon purpusii Brandegee – Snow Mountain beardtongue P
Species  Penstemon putus A. Nelson – Black River beardtongue P
Species  Penstemon radicosus A. Nelson – matroot penstemon P
Species  Penstemon ramosus Crosswh. – lanceleaf beardtongue P
Species  Penstemon rattanii A. Gray – Rattan's beardtongue P
Subspecies  Penstemon rattanii A. Gray ssp. kleei (Greene) D.D. Keck – Santa Cruz Mountains beardtongue P
Subspecies  Penstemon rattanii A. Gray ssp. rattanii – Rattan's beardtongue P
Species  Penstemon retrorsus Payson ex Pennell – Adobe Hills beardtongue P
Species  Penstemon rhizomatosus N.H. Holmgren – Scheel Creek beardtongue P
Species  Penstemon richardsonii Douglas ex Lindl. – cutleaf beardtongue P
Variety  Penstemon richardsonii Douglas ex Lindl. var. curtiflorus (D.D. Keck) Cronquist – cutleaf beardtongue P
Variety  Penstemon richardsonii Douglas ex Lindl. var. dentatus (D.D. Keck) Cronquist – cutleaf beardtongue P
Variety  Penstemon richardsonii Douglas ex Lindl. var. richardsonii – Richardson's penstemon P
Species  Penstemon roezlii Regel – Roezl's penstemon P
Species  Penstemon rostriflorus Kellogg – Bridge penstemon P
Species  Penstemon rubicundus D.D. Keck – Wassuk Range beardtongue P
Species  Penstemon rupicola (Piper) Howell – cliff beardtongue P
Species  Penstemon rydbergii A. Nelson – Rydberg's penstemon P
Variety  Penstemon rydbergii A. Nelson var. aggregatus (Pennell) N.H. Holmgren – meadow beardtongue P
Variety  Penstemon rydbergii A. Nelson var. oreocharis (Greene) N.H. Holmgren – herbaceous penstemon P
Variety  Penstemon rydbergii A. Nelson var. rydbergii – swollen penstemon P
Species  Penstemon saxosorum Pennell – upland beardtongue P
Species  Penstemon scapoides D.D. Keck – pinyon beardtongue P
Species  Penstemon scariosus Pennell – White River beardtongue P
Variety  Penstemon scariosus Pennell var. albifluvis (England) N.H. Holmgren – White River beardtongue P
Variety  Penstemon scariosus Pennell var. cyanomontanus Neese – Neese's Blue Mountain beardtongue P
Variety  Penstemon scariosus Pennell var. garrettii (Pennell) N.H. Holmgren – Garrett's beardtongue P
Variety  Penstemon scariosus Pennell var. scariosus – White River beardtongue P
Species  Penstemon secundiflorus Benth. – sidebells penstemon P
Species  Penstemon seorsus (A. Nelson) D.D. Keck – shortlobe penstemon P
Species  Penstemon sepalulus A. Nelson – littlecup beardtongue P
Species  Penstemon serrulatus Menzies ex Sm. – serrulate penstemon P
Species  Penstemon smallii A. Heller – Small's beardtongue P
Species  Penstemon spatulatus Pennell – Wallowa beardtongue P
Species  Penstemon speciosus Douglas ex Lindl. – royal penstemon P
Species  Penstemon spectabilis Thurb. ex A. Gray – showy penstemon P
Subspecies  Penstemon spectabilis Thurb. ex A. Gray ssp. spectabilis – showy penstemon P
Subspecies  Penstemon spectabilis Thurb. ex A. Gray ssp. subviscosus D.D. Keck – showy penstemon P
Species  Penstemon stenophyllus (A. Gray) Howell – Sonoran beardtongue P
Species  Penstemon stephensii Brandegee – Stephens' penstemon P
Species  Penstemon strictiformis Rydb. – Mancos penstemon P
Species  Penstemon strictus Benth. – Rocky Mountain penstemon P
Species  Penstemon subglaber Rydb. – smooth penstemon P
Species  Penstemon subserratus Pennell – finetooth beardtongue P
Species  Penstemon subulatus M.E. Jones – hackberry beardtongue P
Species  Penstemon sudans M.E. Jones – Susanville beardtongue P
Species  Penstemon superbus A. Nelson – superb beardtongue P
Species  Penstemon tenuiflorus Pennell – eastern whiteflower beardtongue P
Species  Penstemon tenuis Small – sharpsepal beardtongue P
Species  Penstemon teucrioides Greene – germander beardtongue P
Species  Penstemon thompsoniae (A. Gray) Rydb. – Thompson's beardtongue P
Subspecies  Penstemon thompsoniae (A. Gray) Rydb. ssp. jaegeri D.D. Keck – Jaeger's beardtongue P
Subspecies  Penstemon thompsoniae (A. Gray) Rydb. ssp. thompsoniae – Thompson's beardtongue P
Species  Penstemon thurberi Torr. – Thurber's penstemon P
Species  Penstemon tidestromii Pennell – Tidestrom's beardtongue P
Species  Penstemon tiehmii N.H. Holmgren – Tiehm's beardtongue P
Species  Penstemon tracyi D.D. Keck – Trinity penstemon P
Species  Penstemon triflorus A. Heller – Heller's beardtongue P
Subspecies  Penstemon triflorus A. Heller ssp. integrifolius Pennell – Heller's beardtongue P
Subspecies  Penstemon triflorus A. Heller ssp. triflorus – Heller's beardtongue P
Species  Penstemon triphyllus Douglas ex Lindl. – Riggin's penstemon P
Species  Penstemon tubiflorus Nutt. – white wand beardtongue P
Variety  Penstemon tubiflorus Nutt. var. achoreus Fernald – white wand beardtongue P
Variety  Penstemon tubiflorus Nutt. var. tubiflorus – white wand beardtongue P
Species  Penstemon tusharensis N.H. Holmgren – Tushar Range beardtongue P
Species  Penstemon uintahensis Pennell – Uinta Mountain beardtongue P
Species  Penstemon unilateralis Rydb. – oneside penstemon P
Species  Penstemon utahensis Eastw. – Utah penstemon P
Species  Penstemon venustus Douglas ex Lindl. – Venus penstemon P
Species  Penstemon versicolor Pennell – variable-color beardtongue P
Species  Penstemon virens Pennell ex Rydb. – Front Range beardtongue P
Species  Penstemon virgatus A. Gray – upright blue beardtongue P
Species  Penstemon wardii A. Gray – Ward's beardtongue P
Species  Penstemon washingtonensis D.D. Keck – Washington beardtongue P
Species  Penstemon watsonii A. Gray – Watson's penstemon P
Species  Penstemon whippleanus A. Gray – Whipple's penstemon P
Species  Penstemon wilcoxii Rydb. – Wilcox's penstemon P
Species  Penstemon wrightii Hook. – Wright's beardtongue P
Species  Penstemon yampaensis Penl. – Yampa beardtongue P

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