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CCDB → Angiosperms → Plantaginaceae → Penstemon → Penstemon angustifolius
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| ! | Penstemon angustifolius | Penstemon angustifolius Nutt. ex Pursh | 16 | Fedorov, 1974 | Nisbet, Jackson 1960 | ||
| ! | Penstemon angustifolius subsp. caudatus (A. Heller) Rydb. | Penstemon angustifolius subsp. caudatus (A. Heller) D. D. Keck | 8II | 16 | IPCN online | Freeman, C. C. 1983. Chromosome numbers in Great Plains species of Penstemon (Scrophulariaceae). Brittonia 35(3): 232–238. | |
| Penstemon angustifolius var. angustifolius | Penstemon angustifolius Nutt. ex Pursh | 16 | IPCN online | Freeman, C. C. 1983. Chromosome numbers in Great Plains species of Penstemon (Scrophulariaceae). Brittonia 35(3): 232–238. |