| Lateinischer name | Allgemeiner name | Familie | ||
| Penstemon nyeensis Crosswhite | >>Penstemon kingii |
Scrophulariaceae |
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| Penstemon oklahomensis Pennell | Oklahoma beardtongue |
Scrophulariaceae |
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| Penstemon oliganthus Woot. & Standl. | Apache beardtongue |
Scrophulariaceae |
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| Penstemon ophianthus Pennell | coiled anther penstemon |
Scrophulariaceae |
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| Penstemon oreocharis Greene | >>Penstemon rydbergii var. oreocharis |
Scrophulariaceae |
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| Penstemon osterhoutii Pennell | Osterhout s beardtongue |
Scrophulariaceae |
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| Penstemon ovatus Dougl. ex Hook. | eggleaf beardtongue |
Scrophulariaceae |
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| Penstemon ovatus Dougl. ex Hook. var. pinetorum Piper | >>Penstemon wilcoxii |
Scrophulariaceae |
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| Penstemon pachyphyllus Gray ex Rydb. | thickleaf beardtongue |
Scrophulariaceae |
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| Penstemon pachyphyllus Gray ex Rydb. ssp. congestus (M.E. Jones) Keck | >>Penstemon pachyphyllus var. congestus |
Scrophulariaceae |
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| Penstemon pachyphyllus Gray ex Rydb. var. congestus (M.E. Jones) N. Holmgren | thickleaf beardtongue |
Scrophulariaceae |
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| Penstemon pachyphyllus Gray ex Rydb. var. mucronatus (N. Holmgren) Neese | mucronate penstemon |
Scrophulariaceae |
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| Penstemon pachyphyllus Gray ex Rydb. var. pachyphyllus | thickleaf beardtongue |
Scrophulariaceae |
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| Penstemon pahutensis N. Holmgren | Paiute beardtongue |
Scrophulariaceae |
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| Penstemon pallidus Small | pale beardtongue |
Scrophulariaceae |
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| Penstemon pallidus Small ssp. arkansanus (Pennell) Bennett | >>Penstemon arkansanus |
Scrophulariaceae |
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| Penstemon palmeri Gray | Palmer s penstemon |
Scrophulariaceae |
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| Penstemon palmeri Gray ssp. eglandulosus Keck | >>Penstemon palmeri var. eglandulosus |
Scrophulariaceae |
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| Penstemon palmeri Gray ssp. typicus Keck | >>Penstemon palmeri var. palmeri |
Scrophulariaceae |
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| Penstemon palmeri Gray var. eglandulosus (Keck) N. Holmgren | scented beardtongue |
Scrophulariaceae |
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| Penstemon palmeri Gray var. macranthus (Eastw.) N. Holmgren | scented beardtongue |
Scrophulariaceae |
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| Penstemon palmeri Gray var. palmeri | Palmer s penstemon |
Scrophulariaceae |
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| Penstemon papillatus J.T. Howell | Inyo beardtongue |
Scrophulariaceae |
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| Penstemon parryi (Gray) Gray | Parry s beardtongue |
Scrophulariaceae |
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| Penstemon parviflorus Pennell | Montezuma County beardtongue |
Scrophulariaceae |
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| Penstemon parvulus (Gray) Krautter | >>Penstemon azureus ssp. azureus |
Scrophulariaceae |
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| Penstemon parvus Pennell | Aquarius Plateau beardtongue |
Scrophulariaceae |
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| Penstemon patens (M.E. Jones) N. Holmgren | Lone Pine beardtongue |
Scrophulariaceae |
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| Penstemon patricus N. Holmgren | >>Penstemon leonardii var. patricus |
Scrophulariaceae |
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| Penstemon pauciflorus auct. non Greene [misapplied] | >>Penstemon ramosus |
Scrophulariaceae |
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| Penstemon payettensis A. Nels. & J.F. Macbr. | Payette beardtongue |
Scrophulariaceae |
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| Penstemon paysoniorum Keck | Payson s beardtongue |
Scrophulariaceae |
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| Penstemon peckii Pennell | Peck s beardtongue |
Scrophulariaceae |
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| Penstemon penlandii W.A. Weber | Penland s beardtongue |
Scrophulariaceae |
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| Penstemon pennellianus Keck | Blue Mountain beardtongue |
Scrophulariaceae |
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| Penstemon penstemon (L.) Britt. | >>Penstemon laevigatus |
Scrophulariaceae |
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| Penstemon perpulcher A. Nels. | Minidoka beardtongue |
Scrophulariaceae |
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| Penstemon personatus Keck | closethroat beardtongue |
Scrophulariaceae |
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| Penstemon petiolatus Brandeg. | petiolate beardtongue |
Scrophulariaceae |
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| Penstemon pinifolius Greene | pineneedle beardtongue |
Scrophulariaceae |
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| Penstemon pinorum L.& J. Shultz | Pine Valley penstemon |
Scrophulariaceae |
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| Penstemon platyphyllus Rydb. | broadleaf beardtongue |
Scrophulariaceae |
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| Penstemon pratensis Greene | western whiteflower beardtongue |
Scrophulariaceae |
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| Penstemon procerus Dougl. ex Graham | littleflower penstemon |
Scrophulariaceae |
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| Penstemon procerus Dougl. ex Graham ssp. aberrans (M.E. Jones) Keck | >>Penstemon procerus var. aberrans |
Scrophulariaceae |
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| Penstemon procerus Dougl. ex Graham ssp. brachyanthus (Pennell) Keck | >>Penstemon procerus var. brachyanthus |
Scrophulariaceae |
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| Penstemon procerus Dougl. ex Graham ssp. formosus (A. Nels.) Keck | >>Penstemon procerus var. formosus |
Scrophulariaceae |
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| Penstemon procerus Dougl. ex Graham ssp. modestus (Greene) Keck | >>Penstemon procerus var. modestus |
Scrophulariaceae |
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| Penstemon procerus Dougl. ex Graham ssp. tolmiei (Hook.) D. D. Keck | >>Penstemon procerus var. tolmiei |
Scrophulariaceae |
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| Penstemon procerus Dougl. ex Graham var. aberrans (M.E. Jones) A. Nels. | pincushion beardtongue |
Scrophulariaceae |
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| Penstemon procerus Dougl. ex Graham var. brachyanthus (Pennell) Cronq. | pincushion beardtongue |
Scrophulariaceae |
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| Penstemon procerus Dougl. ex Graham var. formosus (A. Nels.) Cronq. | pincushion beardtongue |
Scrophulariaceae |
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| Penstemon procerus Dougl. ex Graham var. modestus (Greene) N. Holmgren | pincushion beardtongue |
Scrophulariaceae |
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| Penstemon procerus Dougl. ex Graham var. procerus | pincushion beardtongue |
Scrophulariaceae |
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| Penstemon procerus Dougl. ex Graham var. tolmiei (Hook.) Cronq. | Tolmie s penstemon |
Scrophulariaceae |
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| Penstemon pruinosus Dougl. ex Lindl. | Chelan beardtongue |
Scrophulariaceae |
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| Penstemon pseudoparvus Crosswhite | Mt. Washington beardtongue |
Scrophulariaceae |
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| Penstemon pseudoputus (Crosswhite) N. Holmgren | Kaibab Plateau beardtongue |
Scrophulariaceae |
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| Penstemon pseudospectabilis M.E. Jones | desert penstemon |
Scrophulariaceae |
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| Penstemon pseudospectabilis M.E. Jones ssp. connatifolius (A. Nels.) Keck | desert beardtongue |
Scrophulariaceae |
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| Penstemon pseudospectabilis M.E. Jones ssp. pseudospectabilis | desert beardtongue |
Scrophulariaceae |
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| Penstemon pseudospectabilis M.E. Jones ssp. typicus Keck | >>Penstemon pseudospectabilis ssp. pseudospectabilis |
Scrophulariaceae |
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| Penstemon puberulentus Rydb. | >>Penstemon gairdneri var. oreganus |
Scrophulariaceae |
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| Penstemon pudicus Reveal & Beatley | Kawich Range beardtongue |
Scrophulariaceae |
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| Penstemon pulchellus Lindl. [excluded] | >>Penstemon campanulatus ssp. chihuahuensis |
Scrophulariaceae |
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| Penstemon pumilus Nutt. | Salmon River beardtongue |
Scrophulariaceae |
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| Penstemon purpusii Brandeg. | Snow Mountain beardtongue |
Scrophulariaceae |
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| Penstemon putus A. Nels. | Black River beardtongue |
Scrophulariaceae |
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| Penstemon radicosus A. Nels. | matroot penstemon |
Scrophulariaceae |
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| Penstemon ramosus Crosswhite | lanceleaf beardtongue |
Scrophulariaceae |
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| Penstemon rattanii Gray | Rattan s beardtongue |
Scrophulariaceae |
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| Penstemon rattanii Gray ssp. kleei (Greene) Keck | Santa Cruz Mountains beardtongue |
Scrophulariaceae |
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| Penstemon rattanii Gray ssp. rattanii | Rattan s beardtongue |
Scrophulariaceae |
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| Penstemon rattanii Gray var. kleei (Green) Gray | >>Penstemon rattanii ssp. kleei |
Scrophulariaceae |
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| Penstemon rattanii Gray var. minor Gray | >>Penstemon anguineus |
Scrophulariaceae |