Penstemon osterhoutii Pennell species accepted

Penstemon ovatus Douglas species accepted

Penstemon pachyphyllus A. Gray ex Rydb. species accepted

Penstemon pahutensis N. H. Holmgren species accepted

Penstemon pallidus Small species accepted

Penstemon palmeri A. Gray species accepted

Penstemon papillatus J. T. Howell species accepted

Penstemon × parishii A. Gray species accepted

Penstemon parryi A. Gray species accepted

Penstemon parvus Pennell species accepted

Penstemon patens (M. E. Jones) N. H. Holmgren species accepted

Penstemon payettensis A. Nelson & J. F. Macbr. species accepted

Penstemon newberryi A. Gray species accepted

Penstemon nitidus Douglas ex Benth. species accepted

Penstemon nudiflorus A. Gray species accepted

Penstemon occiduus Straw species accepted

Penstemon oklahomensis Pennell species accepted

Penstemon oliganthus Wooton & Standl. species accepted

Penstemon ophianthus Pennell species accepted

Penstemon secundiflorus Benth. species accepted

Penstemon seorsus (A. Nelson) D. D. Keck species accepted

Penstemon sepalulus A. Nelson species accepted

Penstemon serrulatus Menzies species accepted

Penstemon smallii A. Heller species accepted

Penstemon spatulatus Pennell species accepted

Penstemon speciosus Douglas species accepted

Penstemon stephensii Brandegee species accepted

Penstemon subglaber Rydb. species accepted

Penstemon tenuiflorus Pennell species accepted

Penstemon tepicensis Straw species accepted

Penstemon teucrioides Greene species accepted

Penstemon strictiformis Rydb. species accepted

Penstemon subserratus Pennell species accepted

Penstemon sudans M. E. Jones species accepted

Penstemon superbus A. Nelson species accepted

Penstemon tenuifolius Benth. species accepted

Penstemon thompsoniae (A. Gray) Rydb. species accepted

Penstemon tidestromii Pennell species accepted

Penstemon paysoniorum D. D. Keck species accepted

Penstemon pennellianus D. D. Keck species accepted

Penstemon perfoliatus Brongn. species accepted

Penstemon personatus D. D. Keck species accepted

Penstemon pinifolius Greene species accepted

Penstemon plagapineus Straw species accepted

Penstemon pratensis Greene species accepted

Penstemon procerus Douglas ex Graham species accepted

Penstemon punctatus Brandegee species accepted

Penstemon retrorsus Payson species accepted

Penstemon roezlii Regel species accepted

Penstemon rotundifolius A. Gray species accepted

Penstemon rupicola (Piper) Howell species accepted

Penstemon pseudoputus (Crosswh.) N. H. Holmgren species accepted

Penstemon pudicus Reveal & Beatley species accepted

Penstemon radicosus A. Nelson species accepted

Penstemon rattanii A. Gray species accepted

Penstemon rhizomatosus N. H. Holmgren species accepted

Penstemon roseus (Cerv. ex Sweet) G. Don species accepted

Penstemon saltarius Crosswh. species accepted

Penstemon scapoides D. D. Keck species accepted

Penstemon schaffneri (Hemsl.) Straw species accepted

Penstemon tracyi D. D. Keck species accepted

Penstemon triphyllus Douglas species accepted

Penstemon uintahensis Pennell species accepted

Penstemon utahensis Eastw. species accepted

Penstemon venustus Douglas species accepted

Penstemon virgatus A. Gray species accepted

Penstemon wardii A. Gray species accepted

Penstemon × mirus A. Nelson species accepted

Penstemon washingtonensis D. D. Keck species accepted

Penstemon whippleanus A. Gray species accepted

Penstemon wislizeni (A. Gray) Straw species accepted

Penstemon × crideri A. Nelson species accepted

Penstemon euglaucus English species accepted

Penstemon eximius D. D. Keck species accepted

Penstemon fasciculatus A. Gray species accepted

Penstemon filisepalis Straw species accepted

Penstemon floribundus Danley species accepted

Penstemon flowersii Neese & S. L. Welsh species accepted

Penstemon fremontii Torr. & A. Gray species accepted

Penstemon fruticosus (Pursh) Greene species accepted

Penstemon gentianoides (Kunth) Poir. species accepted

Penstemon grahamii D. D. Keck species accepted

Penstemon griffinii A. Nelson species accepted

Penstemon gairdneri Hook. species accepted

Penstemon glaber Pursh species accepted

Penstemon globosus (Piper) Pennell & D. D. Keck species accepted

Penstemon gormanii Greene species accepted

Penstemon guadalupensis A. Heller species accepted

Penstemon harbourii A. Gray species accepted

Penstemon hartwegii Benth. species accepted

Penstemon henricksonii Straw species accepted

Penstemon heterophyllus Lindl. species accepted

Penstemon cinicola D. D. Keck species accepted

Penstemon clevelandii A. Gray species accepted

Penstemon cobaea Nutt. species accepted

Penstemon concinnus D. D. Keck species accepted

Penstemon cusickii A. Gray species accepted

Penstemon cyathophorus Rydb. species accepted

Penstemon deamii Pennell species accepted

Penstemon degeneri Crosswh. species accepted

Penstemon deustus Douglas species accepted

Penstemon confertus Douglas species accepted

Penstemon cyananthus Hook. species accepted

Penstemon dasyphyllus A. Gray species accepted

Penstemon deaveri Crosswh. species accepted

Penstemon digitalis Nutt. species accepted

Penstemon discolor D. D. Keck species accepted

Penstemon distans N. H. Holmgren species accepted

Penstemon dugesii Pérez-Calix & Zacarías species accepted

Penstemon ellipticus Coult. & Fisher species accepted

Penstemon eriantherus Pursh species accepted

Penstemon laevis Pennell species accepted

Penstemon laricifolius Hook. & Arn. species accepted

Penstemon laxus A. Nelson species accepted

Penstemon lemhiensis (D. D. Keck) D. D. Keck & Cronquist species accepted

Penstemon leonardii Rydb. species accepted

Penstemon longiflorus (Pennell) S. L. Clark species accepted

Penstemon lyalli (A. Gray) A. Gray species accepted

Penstemon mensarum Pennell species accepted

Penstemon leonensis Straw species accepted

Penstemon linarioides A. Gray species accepted

Penstemon luteus G. L. Nesom species accepted

Penstemon metcalfei Wooton & Standl. species accepted

Penstemon minutifolius Straw species accepted

Penstemon miser A. Gray species accepted

Penstemon moffattii Eastw. species accepted

Penstemon mohinoranus Straw species accepted

Penstemon monoensis A. Heller species accepted

Penstemon montanus Greene species accepted

Penstemon hidalgensis Straw species accepted

Penstemon humilis Nutt. ex A. Gray species accepted

Penstemon jamesii Benth. species accepted

Penstemon hirsutus (L.) Willd. species accepted

Penstemon idahoensis N. D. Atwood & S. L. Welsh species accepted

Penstemon imberbis (Kunth) Trautv. species accepted

Penstemon immanifestus N. H. Holmgren species accepted

Penstemon incertus Brandegee species accepted

Penstemon inflatus Crosswh. species accepted

Penstemon janishiae N. H. Holmgren species accepted

Penstemon kingii S. Watson species accepted

Penstemon kralii D. Estes species accepted

Penstemon labrosus (A. Gray) Mast. ex Hook. fil. species accepted

Penstemon laetus A. Gray species accepted

Penstemon laevigatus Aiton species accepted

Penstemon moriahensis N. H. Holmgren species accepted

Penstemon × moronensis Crosswh. species accepted

Penstemon murrayanus Hook. species accepted

Penstemon nanus D. D. Keck species accepted

Penstemon navajoa N. H. Holmgren species accepted

Penstemon neomexicanus Wooton & Standl. species accepted

Penstemon neotericus D. D. Keck species accepted

Penstemon stenophyllus A. Gray species accepted

Penstemon strictus Benth. species accepted

Penstemon subulatus M. E. Jones species accepted

Penstemon tenuis Small species accepted

Penstemon thurberi Torr. species accepted

Penstemon tiehmii N. H. Holmgren species accepted

Penstemon peckii Pennell species accepted

Penstemon penlandii W. A. Weber species accepted

Penstemon perpulcher A. Nelson species accepted

Penstemon petiolatus Brandegee species accepted

Penstemon pinorum L. M. Shultz & J. S. Shultz species accepted

Penstemon platyphyllus Rydb. species accepted

Penstemon potosinus Straw species accepted

Penstemon pruinosus Douglas species accepted

Penstemon pseudospectabilis M. E. Jones species accepted

Penstemon purpusii Brandegee species accepted

Penstemon richardsonii Douglas species accepted

Penstemon rostriflorus Kellogg species accepted

Penstemon rubicundus D. D. Keck species accepted

Penstemon rydbergii A. Nelson species accepted

Penstemon pseudoparvus Crosswh. species accepted

Penstemon pumilus Nutt. species accepted

Penstemon putus A. Nelson species accepted

Penstemon reidmoranii Zacarías & A. Wolfe species accepted

Penstemon saxosorum Pennell species accepted

Penstemon scariosus Pennell species accepted

Penstemon triflorus A. Heller species accepted

Penstemon unilateralis Rydb. species accepted

Penstemon virens Pennell ex Rydb. species accepted

Penstemon vizcainensis Moran species accepted

Penstemon watsonii A. Gray species accepted

Penstemon wrightii Hook. species accepted

Penstemon vulcanellus Crosswh. species accepted

Penstemon wendtiorum B. L. Turner species accepted

Penstemon wilcoxii Rydb. species accepted

Penstemon yampaensis Penland species accepted

Penstemon × jonesii Pennell species accepted

Penstemon fendleri Torr. & A. Gray species accepted

Penstemon filiformis (D. D. Keck) D. D. Keck species accepted

Penstemon flavescens Pennell species accepted

Penstemon floridus Brandegee species accepted

Penstemon galloensis G. L. Nesom species accepted

Penstemon gentryi Standl. species accepted

Penstemon glaucinus Pennell species accepted

Penstemon goodrichii N. H. Holmgren species accepted

Penstemon gracilentus A. Gray species accepted

Penstemon grinnellii Eastw. species accepted

Penstemon franklinii S. L. Welsh species accepted

Penstemon fruticiformis Coville species accepted

Penstemon gibbensii Dorn species accepted

Penstemon gracilis Nutt. species accepted

Penstemon hallii A. Gray species accepted

Penstemon harringtonii Penland species accepted

Penstemon havardii A. Gray species accepted

Penstemon hesperius M. E. Peck species accepted

Penstemon heterodoxus A. Gray species accepted

Penstemon clutei A. Nelson species accepted

Penstemon comarrhenus A. Gray species accepted

Penstemon confusus M. E. Jones species accepted

Penstemon crandallii A. Heller species accepted

Penstemon cyaneus Pennell species accepted

Penstemon davidsonii Greene species accepted

Penstemon debilis O'Kane & J. L. Anderson species accepted

Penstemon compactus (D. D. Keck) Crosswh. species accepted

Penstemon cyanocaulis Payson species accepted

Penstemon diphyllus Rydb. species accepted

Penstemon dissectus Elliott species accepted

Penstemon dolius M. E. Jones species accepted

Penstemon eatonii A. Gray species accepted

Penstemon elegantulus Pennell species accepted

Penstemon lanceolatus Benth. species accepted

Penstemon laxiflorus Pennell species accepted

Penstemon leiophyllus Pennell species accepted

Penstemon lentus Pennell species accepted

Penstemon luculentus R. L. Johnson & M. R. Stevens species accepted

Penstemon marcusii (D. D. Keck) N. H. Holmgren species accepted

Penstemon miniatus Lindl. species accepted

Penstemon absarokensis Evert species accepted

Penstemon acaulis L. O. Williams species accepted

Penstemon abietinus Pennell species accepted

Penstemon acuminatus Douglas species accepted

Penstemon alamosensis Pennell & Nisbet species accepted

Penstemon albertinus Greene species accepted

Penstemon albidus Nutt. species accepted

Penstemon albomarginatus M. E. Jones species accepted

Penstemon ambiguus Torr. species accepted

Penstemon ammophilus N. H. Holmgren & L. M. Schultz species accepted

Penstemon amphorellae Crosswh. species accepted

Penstemon anguineus Eastw. species accepted

Penstemon bradburyi Pursh species accepted

Penstemon breviculus (D. D. Keck) Nisbet & R. C. Jacks. species accepted

Penstemon × bryantiae D. D. Keck species accepted

Penstemon buckleyi Pennell species accepted

Penstemon caesius A. Gray species accepted

Penstemon caespitosus Nutt. ex A. Gray species accepted

Penstemon californicus (Munz & L M. Johnst.) D. D. Keck species accepted

Penstemon campanulatus (Cav.) Willd. species accepted

Penstemon caryi Pennell species accepted

Penstemon cedrosensis Krautter species accepted

Penstemon angustifolius Nutt. ex Pursh species accepted

Penstemon calcareus Brandegee species accepted

Penstemon calycosus Small species accepted

Penstemon canescens (Britton) Britton species accepted

Penstemon cardinalis Wooton & Standl. species accepted

Penstemon cardwellii Howell species accepted

Penstemon carnosus Pennell species accepted

Penstemon centranthifolius (Benth.) Benth. species accepted

Penstemon arenarius Greene species accepted

Penstemon arenicola A. Nelson species accepted

Penstemon aridus Rydb. species accepted

Penstemon arkansanus Pennell species accepted

Penstemon atropurpureus (Sweet) G. Don species accepted

Penstemon attenuatus Douglas species accepted

Penstemon auriberbis Pennell species accepted

Penstemon australis Small species accepted

Penstemon baccharifolius Hook. species accepted

Penstemon barrettiae A. Gray species accepted

Penstemon bicolor (Brandegee) Clokey & D. D. Keck species accepted

Penstemon bolanius Straw species accepted

Penstemon bracteatus D. D. Keck species accepted

Penstemon atwoodii S. L. Welsh species accepted

Penstemon azureus Benth. species accepted

Penstemon barbatus (Cav.) Roth species accepted

Penstemon barnebyi N. H. Holmgren species accepted

Penstemon bleaklyi O'Kane & K. D. Heil species accepted

Penstemon tubaeflorus Nutt. species accepted

Penstemon brevisepalus Pennell species accepted

Penstemon duchesnensis (N. H. Holmgren) Neese species accepted

Penstemon mucronatus N. H. Holmgren species accepted

Penstemon parvulus (A. Gray) Krautter species accepted

Penstemon angelicus (I. M. Johnst.) Moran species accepted

Penstemon curtiflorus (D. D. Keck) N. H. Holmgren species accepted

Penstemon salmonensis N. H. Holmgren species accepted

Penstemon xylus A. Nelson species accepted

Penstemon isophyllus B. L. Rob. species accepted

Penstemon multiflorus (Benth.) Chapm. ex Small species accepted

Penstemon × dubius Davidson species accepted

Penstemon × peirsonii Munz & I. M. Johnst. species accepted

Penstemon glandulosus Douglas ex Lindl. species accepted

Penstemon haydenii S. Watson ex Coult. species accepted

Penstemon spectabilis Thurb. ex Torr. & A. Gray species accepted