| Lateinischer name | Allgemeiner name | Familie | ||
| Penstemon laricifolius Hook. & Arn. ssp. laricifolius | larchleaf beardtongue |
Scrophulariaceae |
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| Penstemon laricifolius Hook. & Arn. var. exilifolius (A. Nels.) Payson | >>Penstemon laricifolius ssp. exilifolius |
Scrophulariaceae |
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| Penstemon laricifolius Hook. & Arn. var. laricifolius | >>Penstemon laricifolius ssp. laricifolius |
Scrophulariaceae |
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| Penstemon laxiflorus Pennell | nodding beardtongue |
Scrophulariaceae |
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| Penstemon laxus A. Nels. | tufted penstemon |
Scrophulariaceae |
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| Penstemon leiophyllus Pennell | smoothleaf beardtongue |
Scrophulariaceae |
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| Penstemon leiophyllus Pennell var. francisci-pennellii (Crosswhite) N. Holmgren | smoothleaf beardtongue |
Scrophulariaceae |
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| Penstemon leiophyllus Pennell var. keckii (Clokey) N. Holmgren | Keck s beardtongue |
Scrophulariaceae |
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| Penstemon leiophyllus Pennell var. leiophyllus | smoothleaf beardtongue |
Scrophulariaceae |
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| Penstemon lemhiensis (Keck) Keck & Cronq. | Lemhi penstemon |
Scrophulariaceae |
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| Penstemon lemmonii Gray | >>Keckiella lemmonii |
Scrophulariaceae |
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| Penstemon lentus Pennell | handsome beardtongue |
Scrophulariaceae |
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| Penstemon lentus Pennell ssp. albiflorus Keck | >>Penstemon lentus var. albiflorus |
Scrophulariaceae |
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| Penstemon lentus Pennell var. albiflorus (Keck) Reveal | handsome beardtongue |
Scrophulariaceae |
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| Penstemon lentus Pennell var. lentus | handsome beardtongue |
Scrophulariaceae |
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| Penstemon leonardii Rydb. | Leonard s beardtongue |
Scrophulariaceae |
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| Penstemon leonardii Rydb. var. higginsii Neese | Higgins beardtongue |
Scrophulariaceae |
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| Penstemon leonardii Rydb. var. leonardii | Leonard s beardtongue |
Scrophulariaceae |
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| Penstemon leonardii Rydb. var. patricus (N. Holmgren) Neese | Leonard s beardtongue |
Scrophulariaceae |
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| Penstemon leptanthus Pennell | Sevier Plateau beardtongue |
Scrophulariaceae |
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| Penstemon linarioides Gray | toadflax penstemon |
Scrophulariaceae |
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| Penstemon linarioides Gray ssp. coloradoensis (A. Nels.) Keck | toadflax penstemon |
Scrophulariaceae |
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| Penstemon linarioides Gray ssp. compactifolius Keck | toadflax beardtongue |
Scrophulariaceae |
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| Penstemon linarioides Gray ssp. linarioides | toadflax beardtongue |
Scrophulariaceae |
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| Penstemon linarioides Gray ssp. maguirei Keck | Maguire s penstemon |
Scrophulariaceae |
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| Penstemon linarioides Gray ssp. sileri (Gray) Keck | Siler s penstemon |
Scrophulariaceae |
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| Penstemon linarioides Gray ssp. taosensis Keck | >>Penstemon crandallii ssp. taosensis |
Scrophulariaceae |
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| Penstemon linarioides Gray ssp. typicus Keck | >>Penstemon linarioides ssp. linarioides |
Scrophulariaceae |
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| Penstemon linarioides Gray var. sileri Gray | >>Penstemon linarioides ssp. sileri |
Scrophulariaceae |
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| Penstemon linarioides Gray var. viridis Keck | >>Penstemon linarioides ssp. sileri |
Scrophulariaceae |
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| Penstemon longiflorus (Pennell) S.L. Clark | longflower penstemon |
Scrophulariaceae |
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| Penstemon lyallii (Gray) Gray | Lyall s beardtongue |
Scrophulariaceae |
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| Penstemon macranthus Eastw. | >>Penstemon palmeri var. macranthus |
Scrophulariaceae |
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| Penstemon maguirei Crosswhite | >>Penstemon arenarius |
Scrophulariaceae |
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| Penstemon marcusii (Keck) N. Holmgren | Marcus beardtongue |
Scrophulariaceae |
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| Penstemon mensarum Pennell | tiger beardtongue |
Scrophulariaceae |
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| Penstemon menziesii Hook. p.p. | >>Penstemon davidsonii var. menziesii |
Scrophulariaceae |
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| Penstemon menziesii Hook. ssp. davidsonii (Greene) Piper | >>Penstemon davidsonii var. davidsonii |
Scrophulariaceae |
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| Penstemon menziesii Hook. ssp. thompsonii Pennell | >>Penstemon davidsonii var. davidsonii |
Scrophulariaceae |
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| Penstemon metcalfei Woot. & Standl. | Metcalfe s beardtongue |
Scrophulariaceae |
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| Penstemon microphyllus Gray | >>Keckiella antirrhinoides ssp. microphylla |
Scrophulariaceae |
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| Penstemon minidokanus A. Nels. & J.F. Macbr. | >>Penstemon perpulcher |
Scrophulariaceae |
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| Penstemon miser Gray | Malheur penstemon |
Scrophulariaceae |
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| Penstemon modestus Greene | >>Penstemon procerus var. modestus |
Scrophulariaceae |
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| Penstemon moffatii Eastw. | Moffatt s beardtongue |
Scrophulariaceae |
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| Penstemon moffatii Eastw. ssp. marcusii Keck | >>Penstemon marcusii |
Scrophulariaceae |
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| Penstemon moffatii Eastw. ssp. moffatii | Moffatt s beardtongue |
Scrophulariaceae |
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| Penstemon moffatii Eastw. ssp. paysonii (Pennell) Keck | Moffatt s beardtongue |
Scrophulariaceae |
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| Penstemon monoensis Heller | Mono penstemon |
Scrophulariaceae |
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| Penstemon montanus Greene | cordroot beardtongue |
Scrophulariaceae |
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| Penstemon montanus Greene ssp. idahoensis Pennell & Keck | >>Penstemon montanus var. idahoensis |
Scrophulariaceae |
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| Penstemon montanus Greene var. idahoensis (Pennell & Keck) Cronq. | Central Idaho penstemon |
Scrophulariaceae |
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| Penstemon montanus Greene var. montanus | cordroot beardtongue |
Scrophulariaceae |
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| Penstemon moriahensis N. Holmgren | Mt. Moriah beardtongue |
Scrophulariaceae |
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| Penstemon mucronatus N. Holmgren | >>Penstemon pachyphyllus var. mucronatus |
Scrophulariaceae |
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| Penstemon multicaulis Pennell | >>Penstemon arkansanus |
Scrophulariaceae |
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| Penstemon multiflorus Chapman ex Benth. | manyflower beardtongue |
Scrophulariaceae |
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| Penstemon murrayanus Hook. | scarlet beardtongue |
Scrophulariaceae |
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| Penstemon nanus Keck | dwarf beardtongue |
Scrophulariaceae |
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| Penstemon navajoa N. Holmgren | Navajo Mountain beardtongue |
Scrophulariaceae |
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| Penstemon nemorosus (Dougl. ex Lindl.) Trautv. | >>Nothochelone nemorosa |
Scrophulariaceae |
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| Penstemon neomexicanus Woot. & Standl. | New Mexico beardtongue |
Scrophulariaceae |
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| Penstemon neotericus Keck | Plumas County beardtongue |
Scrophulariaceae |
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| Penstemon newberryi Gray | mountain pride |
Scrophulariaceae |
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| Penstemon newberryi Gray ssp. berryi (Eastw.) Keck | Berry s penstemon |
Scrophulariaceae |
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| Penstemon newberryi Gray ssp. newberryi | mountain pride |
Scrophulariaceae |
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| Penstemon newberryi Gray ssp. sonomensis (Greene) Keck | Sonoma penstemon |
Scrophulariaceae |
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| Penstemon newberryi Gray var. berryi (Eastw.) N. Holmgren | >>Penstemon newberryi ssp. berryi |
Scrophulariaceae |
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| Penstemon newberryi Gray var. newberryi Gray [superfluous autonym] | >>Penstemon newberryi |
Scrophulariaceae |
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| Penstemon newberryi Gray var. sonomensis (Greene) Jepson | >>Penstemon newberryi ssp. sonomensis |
Scrophulariaceae |
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| Penstemon nitidus Dougl. ex Benth. | waxleaf penstemon |
Scrophulariaceae |
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| Penstemon nitidus Dougl. ex Benth. ssp. polyphyllus Pennell | >>Penstemon nitidus var. polyphyllus |
Scrophulariaceae |
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| Penstemon nitidus Dougl. ex Benth. var. nitidus | waxleaf penstemon |
Scrophulariaceae |
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| Penstemon nitidus Dougl. ex Benth. var. polyphyllus (Pennell) Cronq. | waxleaf penstemon |
Scrophulariaceae |
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| Penstemon nudiflorus Gray | Flagstaff beardtongue |
Scrophulariaceae |