Taxa: Penstemon angustifolius, Penstemon angustifolius var. venosus (Penstemon angustifolius ssp. venosus, Penstemon venosus), Penstemon angustifolius var. caudatus (Penstemon caudatus, Penstemon angustifolius ssp. caudatus), Penstemon angustifolius var. angustifolius, Penstemon angustifolius var. dulcis,
... (show all) Penstemon angustifolius var. vernalensis