Every accepted species in the genus is listed. A name links to its page when we hold at least three commercially licensed photographs of it. Where we do not, the row shows how many we actually found, which is usually none.
| Species | Authority | Usable photographs | Page |
|---|---|---|---|
| Penstemon digitalis | Nutt. ex Sims | 1,407 | documented |
| Penstemon cobaea | Nutt. | 758 | documented |
| Penstemon centranthifolius | (Benth.) Benth. | 557 | documented |
| Penstemon fruticosus | (Pursh) Greene | 517 | documented |
| Penstemon barbatus | (Cav.) Roth | 479 | documented |
| Penstemon newberryi | A.Gray | 448 | documented |
| Penstemon palmeri | A.Gray | 389 | documented |
| Penstemon heterophyllus | Lindl. | 356 | documented |
| Penstemon whippleanus | A.Gray | 356 | documented |
| Penstemon serrulatus | Menzies ex Sm. | 330 | documented |
| Penstemon davidsonii | Greene | 327 | documented |
| Penstemon speciosus | Douglas | 325 | documented |
| Penstemon eatonii | A.Gray | 310 | documented |
| Penstemon procerus | Douglas ex Graham | 299 | documented |
| Penstemon rostriflorus | Kellogg | 292 | documented |
| Penstemon spectabilis | Thurb. ex A.Gray | 292 | documented |
| Penstemon virens | Pennell ex Rydb. | 290 | documented |
| Penstemon hirsutus | (L.) Willd. | 285 | documented |
| Penstemon strictus | Benth. | 283 | documented |
| Penstemon deustus | Douglas | 241 | documented |
| Penstemon laevigatus | Aiton | 238 | documented |
| Penstemon albidus | Nutt. | 219 | documented |
| Penstemon laxiflorus | Pennell | 218 | documented |
| Penstemon neomexicanus | Wooton & Standl. | 217 | documented |
| Penstemon secundiflorus | Benth. | 216 | documented |
| Penstemon parryi | A.Gray | 198 | documented |
| Penstemon grinnellii | Eastw. | 195 | documented |
| Penstemon rydbergii | A.Nelson | 187 | documented |
| Penstemon bradburyi | Pursh | 183 | documented |
| Penstemon confertus | Douglas | 182 | documented |
| Penstemon multiflorus | (Benth.) Chapm. ex Small | 142 | documented |
| Penstemon angustifolius | Nutt. ex Pursh | 136 | documented |
| Penstemon utahensis | Eastw. | 132 | documented |
| Penstemon gracilis | Nutt. | 125 | documented |
| Penstemon baccharifolius | Hook. | 123 | documented |
| Penstemon fendleri | Torr. & A.Gray | 121 | documented |
| Penstemon nitidus | Douglas ex Benth. | 118 | documented |
| Penstemon ellipticus | J.M.Coult. & Fisher | 110 | documented |
| Penstemon labrosus | (A.Gray) Mast. ex Hook.f. | 100 | documented |
| Penstemon roseus | (Cerv. ex Sweet) G.Don | 100 | documented |
| Penstemon heterodoxus | A.Gray | 98 | documented |
| Penstemon linarioides | A.Gray | 94 | documented |
| Penstemon richardsonii | Douglas ex Lindl. | 94 | documented |
| Penstemon rupicola | (Piper) Howell | 93 | documented |
| Penstemon ambiguus | Torr. | 90 | documented |
| Penstemon glaber | Pursh | 87 | documented |
| Penstemon laetus | A.Gray | 86 | documented |
| Penstemon pseudospectabilis | M.E.Jones | 86 | documented |
| Penstemon tubaeflorus | Nutt. | 84 | documented |
| Penstemon cyananthus | Hook. | 82 | documented |
| Penstemon confusus | M.E.Jones | 80 | documented |
| Penstemon pallidus | Small | 78 | documented |
| Penstemon patens | (M.E.Jones) N.H.Holmgren | 74 | documented |
| Penstemon cardwellii | Howell | 68 | documented |
| Penstemon humilis | Nutt. ex A.Gray | 68 | documented |
| Penstemon gentianoides | (Kunth) Poir. | 67 | documented |
| Penstemon canescens | Britton | 66 | documented |
| Penstemon eriantherus | Nutt. ex Pursh | 65 | documented |
| Penstemon comarrhenus | A.Gray | 62 | documented |
| Penstemon tenuis | Small | 60 | documented |
| Penstemon lyallii | (A.Gray) A.Gray | 58 | documented |
| Penstemon tenuiflorus | Pennell | 58 | documented |
| Penstemon hallii | A.Gray | 53 | documented |
| Penstemon australis | Small | 50 | documented |
| Penstemon cyaneus | Pennell | 50 | documented |
| Penstemon pruinosus | Douglas | 49 | documented |
| Penstemon virgatus | A.Gray | 49 | documented |
| Penstemon jamesii | Benth. | 48 | documented |
| Penstemon gracilentus | A.Gray | 45 | documented |
| Penstemon roezlii | Regel | 45 | documented |
| Penstemon scapoides | D.D.Keck | 45 | documented |
| Penstemon thurberi | Torr. | 45 | documented |
| Penstemon radicosus | A.Nelson | 42 | documented |
| Penstemon calycosus | Small | 41 | documented |
| Penstemon euglaucus | English | 41 | documented |
| Penstemon laevis | Pennell | 40 | documented |
| Penstemon monoensis | A.Heller | 40 | documented |
| Penstemon gormanii | Greene | 37 | documented |
| Penstemon albertinus | Greene | 35 | documented |
| Penstemon papillatus | J.T.Howell | 35 | documented |
| Penstemon triflorus | A.Heller | 34 | documented |
| Penstemon leiophyllus | Pennell | 33 | documented |
| Penstemon wilcoxii | Rydb. | 33 | documented |
| Penstemon diphyllus | Rydb. | 32 | documented |
| Penstemon gairdneri | Hook. | 32 | documented |
| Penstemon watsonii | A.Gray | 31 | documented |
| Penstemon montanus | Greene | 30 | documented |
| Penstemon campanulatus | (Cav.) Willd. | 29 | documented |
| Penstemon kralii | D.Estes | 28 | documented |
| Penstemon oliganthus | Wooton & Standl. | 28 | documented |
| Penstemon pachyphyllus | A.Gray ex Rydb. | 27 | documented |
| Penstemon buckleyi | Pennell | 26 | documented |
| Penstemon attenuatus | Douglas | 25 | documented |
| Penstemon purpusii | Brandegee | 25 | documented |
| Penstemon laricifolius | Hook. & Arn. | 24 | documented |
| Penstemon caesius | A.Gray | 23 | documented |
| Penstemon californicus | (Munz & I.M.Johnst.) D.D.Keck | 22 | documented |
| Penstemon clevelandii | A.Gray | 22 | documented |
| Penstemon platyphyllus | Rydb. | 22 | documented |
| Penstemon azureus | Benth. | 21 | documented |
| Penstemon calcareus | Brandegee | 21 | documented |
| Penstemon pinifolius | Greene | 21 | documented |
| Penstemon caespitosus | Nutt. ex A.Gray | 20 | documented |
| Penstemon murrayanus | Hook. | 20 | documented |
| Penstemon pumilus | Nutt. | 20 | documented |
| Penstemon subglaber | Rydb. | 20 | documented |
| Penstemon venustus | Douglas | 20 | documented |
| Penstemon acuminatus | Douglas ex Lindl. | 18 | documented |
| Penstemon crandallii | A.Nelson | 18 | documented |
| Penstemon filiformis | (D.D.Keck) D.D.Keck | 18 | documented |
| Penstemon fruticiformis | Coville | 17 | documented |
| Penstemon incertus | Brandegee | 17 | documented |
| Penstemon pseudoputus | (Crosswh.) N.H.Holmgren | 17 | documented |
| Penstemon lemhiensis | (D.D.Keck) D.D.Keck & Cronquist | 16 | documented |
| Penstemon anguineus | Eastw. | 15 | documented |
| Penstemon arenarius | Greene | 15 | documented |
| Penstemon peckii | Pennell | 15 | documented |
| Penstemon albomarginatus | M.E.Jones | 14 | documented |
| Penstemon bicolor | (Brandegee) Clokey & D.D.Keck | 14 | documented |
| Penstemon janishiae | N.H.Holmgren | 14 | documented |
| Penstemon lanceolatus | Benth. | 14 | documented |
| Penstemon petiolatus | Brandegee | 14 | documented |
| Penstemon cyanocaulis | Payson | 13 | documented |
| Penstemon ophianthus | Pennell | 13 | documented |
| Penstemon perfoliatus | Al.Brongn. | 13 | documented |
| Penstemon leonardii | Rydb. | 12 | documented |
| Penstemon mensarum | Pennell | 12 | documented |
| Penstemon parvulus | (A.Gray) Krautter | 12 | documented |
| Penstemon pratensis | Greene | 12 | documented |
| Penstemon barrettiae | A.Gray | 11 | documented |
| Penstemon kingii | S.Watson | 11 | documented |
| Penstemon leonensis | Straw | 11 | documented |
| Penstemon oklahomensis | Pennell | 11 | documented |
| Penstemon subulatus | M.E.Jones | 11 | documented |
| Penstemon superbus | A.Nelson | 11 | documented |
| Penstemon arkansanus | Pennell | 10 | documented |
| Penstemon breviculus | (D.D.Keck) G.T.Nisbet & R.C.Jacks. | 10 | documented |
| Penstemon havardii | A.Gray | 10 | documented |
| Penstemon barnebyi | N.H.Holmgren | 9 | documented |
| Penstemon brevisepalus | Pennell | 9 | documented |
| Penstemon clutei | A.Nelson | 9 | documented |
| Penstemon dasyphyllus | A.Gray | 9 | documented |
| Penstemon aridus | Rydb. | 8 | documented |
| Penstemon cerrosensis | Kellogg | 8 | documented |
| Penstemon cinicola | D.D.Keck | 8 | documented |
| Penstemon hesperius | M.E.Peck | 8 | documented |
| Penstemon moffatii | Eastw. | 8 | documented |
| Penstemon sudans | M.E.Jones | 8 | documented |
| Penstemon thompsoniae | (A.Gray) Rydb. | 8 | documented |
| Penstemon deaveri | Crosswh. | 7 | documented |
| Penstemon immanifestus | N.H.Holmgren | 7 | documented |
| Penstemon inflatus | Crosswh. | 7 | documented |
| Penstemon mucronatus | N.H.Holmgren | 7 | documented |
| Penstemon rattanii | A.Gray | 7 | documented |
| Penstemon sepalulus | A.Nelson | 7 | documented |
| Penstemon subserratus | Pennell | 7 | documented |
| Penstemon amphorellae | Crosswh. | 6 | documented |
| Penstemon arenicola | A.Nelson | 6 | documented |
| Penstemon personatus | D.D.Keck | 6 | documented |
| Penstemon wislizeni | (A.Gray) Straw | 6 | documented |
| Penstemon eximius | D.D.Keck | 5 | documented |
| Penstemon griffinii | A.Nelson | 5 | documented |
| Penstemon saxosorum | Pennell | 5 | documented |
| Penstemon stenophyllus | A.Gray | 5 | documented |
| Penstemon bleaklyi | O'Kane & K.D.Heil | 4 | documented |
| Penstemon globosus | (Piper) Pennell & D.D.Keck | 4 | documented |
| Penstemon hartwegii | Benth. | 4 | documented |
| Penstemon lentus | Pennell | 4 | documented |
| Penstemon miser | A.Gray | 4 | documented |
| Penstemon osterhoutii | Pennell | 4 | documented |
| Penstemon payettensis | A.Nelson & J.F.Macbr. | 4 | documented |
| Penstemon alamosensis | Pennell & Nisbet | 3 | documented |
| Penstemon auriberbis | Pennell | 3 | documented |
| Penstemon cardinalis | Wooton & Standl. | 3 | documented |
| Penstemon cyathophorus | Rydb. | 3 | documented |
| Penstemon flowersii | Neese & S.L.Welsh | 3 | documented |
| Penstemon ovatus | Douglas | 3 | documented |
| Penstemon pennellianus | D.D.Keck | 3 | documented |
| Penstemon wrightii | Hook. | 3 | documented |
| Penstemon ammophilus | N.H.Holmgren & L.M.Schultz | 4 | below the evidence gate |
| Penstemon compactus | (D.D.Keck) Crosswh. | 2 | below the evidence gate |
| Penstemon discolor | D.D.Keck | 2 | below the evidence gate |
| Penstemon floridus | Brandegee | 2 | below the evidence gate |
| Penstemon metcalfei | Wooton & Standl. | 2 | below the evidence gate |
| Penstemon neotericus | D.D.Keck | 2 | below the evidence gate |
| Penstemon triphyllus | Douglas | 2 | below the evidence gate |
| Penstemon carnosus | Pennell | 1 | below the evidence gate |
| Penstemon guadalupensis | A.Heller | 1 | below the evidence gate |
| Penstemon isophyllus | B.L.Rob. | 1 | below the evidence gate |
| Penstemon miniatus | Lindl. | 1 | below the evidence gate |
| Penstemon reidmoranii | Zacarías & A.Wolfe | 1 | below the evidence gate |
| Penstemon strictiformis | Rydb. | 1 | below the evidence gate |
| Penstemon × crideri | A.Nelson | 0 | below the evidence gate |
| Penstemon × dubius | Davidson | 0 | below the evidence gate |
| Penstemon × mirus | A.Nelson | 0 | below the evidence gate |
| Penstemon × parishii | A.Gray | 0 | below the evidence gate |
| Penstemon × peirsonii | Munz & I.M.Johnst. | 0 | below the evidence gate |
| Penstemon abietinus | Pennell | 0 | below the evidence gate |
| Penstemon absarokensis | Evert | 0 | below the evidence gate |
| Penstemon acaulis | L.O.Williams | 0 | below the evidence gate |
| Penstemon albifluvis | England | 0 | below the evidence gate |
| Penstemon angelicus | (I.M.Johnst.) Moran | 0 | below the evidence gate |
| Penstemon atropurpureus | (Sweet) G.Don | 0 | below the evidence gate |
| Penstemon atwoodii | S.L.Welsh | 0 | below the evidence gate |
| Penstemon bolanius | Straw | 0 | below the evidence gate |
| Penstemon bolanus | Straw | 0 | below the evidence gate |
| Penstemon bracteatus | D.D.Keck | 0 | below the evidence gate |
| Penstemon brevibarbatus | Crosswhite | 0 | below the evidence gate |
| Penstemon caryi | Pennell | 0 | below the evidence gate |
| Penstemon cedrosensis | Krautter | 0 | below the evidence gate |
| Penstemon concinnus | D.D.Keck | 0 | below the evidence gate |
| Penstemon curtiflorus | (D.D.Keck) N.H.Holmgren | 0 | below the evidence gate |
| Penstemon cusickii | A.Gray | 0 | below the evidence gate |
| Penstemon deamii | Pennell | 0 | below the evidence gate |
| Penstemon debilis | O'Kane & J.L.Anderson | 0 | below the evidence gate |
| Penstemon degeneri | Crosswh. | 0 | below the evidence gate |
| Penstemon dissectus | Elliott | 0 | below the evidence gate |
| Penstemon distans | N.H.Holmgren | 0 | below the evidence gate |
| Penstemon dolius | M.E.Jones | 0 | below the evidence gate |
| Penstemon duchesnensis | (N.H.Holmgren) Neese | 0 | below the evidence gate |
| Penstemon dugesii | Pérez-Calix & Zacarías | 0 | below the evidence gate |
| Penstemon elegantulus | Pennell | 0 | below the evidence gate |
| Penstemon fasciculatus | A.Gray | 0 | below the evidence gate |
| Penstemon filisepalis | Straw | 0 | below the evidence gate |
| Penstemon flavescens | Pennell | 0 | below the evidence gate |
| Penstemon floribundus | Danley | 0 | below the evidence gate |
| Penstemon franklinii | S.L.Welsh | 0 | below the evidence gate |
| Penstemon fremontii | Torr. & A.Gray | 0 | below the evidence gate |
| Penstemon galloensis | G.L.Nesom | 0 | below the evidence gate |
| Penstemon gentryi | Standl. | 0 | below the evidence gate |
| Penstemon gibbensii | Dorn | 0 | below the evidence gate |
| Penstemon glandulosus | Douglas ex Lindl. | 0 | below the evidence gate |
| Penstemon glaucinus | Pennell | 0 | below the evidence gate |
| Penstemon goodrichii | N.H.Holmgren | 0 | below the evidence gate |
| Penstemon grahamii | D.D.Keck | 0 | below the evidence gate |
| Penstemon harbourii | A.Gray | 0 | below the evidence gate |
| Penstemon harringtonii | Penland | 0 | below the evidence gate |
| Penstemon haydenii | S.Watson ex J.M.Coult. | 0 | below the evidence gate |
| Penstemon henricksonii | Straw | 0 | below the evidence gate |
| Penstemon hidalgensis | Straw | 0 | below the evidence gate |
| Penstemon idahoensis | N.D.Atwood & S.L.Welsh | 0 | below the evidence gate |
| Penstemon imberbis | (Kunth) Trautv. | 0 | below the evidence gate |
| Penstemon jaliscensis | B.L.Rob. | 0 | below the evidence gate |
| Penstemon jonesii | Pennell | 0 | below the evidence gate |
| Penstemon laxus | A.Nelson | 0 | below the evidence gate |
| Penstemon longiflorus | (Pennell) S.L.Clark | 0 | below the evidence gate |
| Penstemon luteus | G.L.Nesom | 0 | below the evidence gate |
| Penstemon marcusii | (D.D.Keck) N.H.Holmgren | 0 | below the evidence gate |
| Penstemon minutifolius | Straw | 0 | below the evidence gate |
| Penstemon mohinoranus | Straw | 0 | below the evidence gate |
| Penstemon moriahensis | N.H.Holmgren | 0 | below the evidence gate |
| Penstemon moronensis | Crosswh. | 0 | below the evidence gate |
| Penstemon nanus | D.D.Keck | 0 | below the evidence gate |
| Penstemon navajoa | N.H.Holmgren | 0 | below the evidence gate |
| Penstemon nudiflorus | A.Gray | 0 | below the evidence gate |
| Penstemon occiduus | Straw | 0 | below the evidence gate |
| Penstemon pahutensis | N.H.Holmgren | 0 | below the evidence gate |
| Penstemon parvus | Pennell | 0 | below the evidence gate |
| Penstemon paysoniorum | D.D.Keck | 0 | below the evidence gate |
| Penstemon penlandii | W.A.Weber | 0 | below the evidence gate |
| Penstemon perpulcher | A.Nelson | 0 | below the evidence gate |
| Penstemon pinorum | L.M.Shultz & J.S.Shultz | 0 | below the evidence gate |
| Penstemon plagapineus | Straw | 0 | below the evidence gate |
| Penstemon potosinus | Straw | 0 | below the evidence gate |
| Penstemon pseudoparvus | Crosswh. | 0 | below the evidence gate |
| Penstemon pudicus | Reveal & Beatley | 0 | below the evidence gate |
| Penstemon punctatus | Brandegee | 0 | below the evidence gate |
| Penstemon putus | A.Nelson | 0 | below the evidence gate |
| Penstemon retrorsus | Payson | 0 | below the evidence gate |
| Penstemon rhizomatosus | N.H.Holmgren | 0 | below the evidence gate |
| Penstemon rotundifolius | A.Gray | 0 | below the evidence gate |
| Penstemon rubicundus | D.D.Keck | 0 | below the evidence gate |
| Penstemon salmonensis | N.H.Holmgren | 0 | below the evidence gate |
| Penstemon saltarius | Crosswh. | 0 | below the evidence gate |
| Penstemon scariosus | Pennell | 0 | below the evidence gate |
| Penstemon schaffneri | (Hemsl.) Straw | 0 | below the evidence gate |
| Penstemon seorsus | (A.Nelson) D.D.Keck | 0 | below the evidence gate |
| Penstemon smallii | A.Heller | 0 | below the evidence gate |
| Penstemon spatulatus | Pennell | 0 | below the evidence gate |
| Penstemon stephensii | Brandegee | 0 | below the evidence gate |
| Penstemon tenuifolius | Benth. | 0 | below the evidence gate |
| Penstemon tepicensis | Straw | 0 | below the evidence gate |
| Penstemon teucrioides | Greene | 0 | below the evidence gate |
| Penstemon tidestromii | Pennell | 0 | below the evidence gate |
| Penstemon tiehmii | N.H.Holmgren | 0 | below the evidence gate |
| Penstemon tracyi | D.D.Keck | 0 | below the evidence gate |
| Penstemon tubiflorus | Nutt. | 0 | below the evidence gate |
| Penstemon uintahensis | Pennell | 0 | below the evidence gate |
| Penstemon vizcainensis | Moran | 0 | below the evidence gate |
| Penstemon vulcanellus | Crosswh. | 0 | below the evidence gate |
| Penstemon wardii | A.Gray | 0 | below the evidence gate |
| Penstemon washingtonensis | D.D.Keck | 0 | below the evidence gate |
| Penstemon wendtiorum | B.L.Turner | 0 | below the evidence gate |
| Penstemon xylus | A.Nelson | 0 | below the evidence gate |
| Penstemon yampaensis | Penland | 0 | below the evidence gate |
This site is commercial, so it can only publish photographs licensed for commercial use. Roughly three quarters of the photographs on iNaturalist are CC BY-NC, which excludes them. A species needs at least three usable photographs before we will build it a page, because a page with one picture and no traits tells you nothing you could not get from a search result, and generating hundreds of thousands of those is precisely the practice that got the previous version of this site deleted.
So the species above without a link are not errors and they are not omissions. They are real, accepted plants that we cannot yet document to the standard we hold ourselves to, and the count in the photographs column is exactly how far short we fall.