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CCDB → Angiosperms → Plantaginaceae → Penstemon → Penstemon attenuatus Douglas ex Lindl.
| Name | Accepted Name | Gametophytic(n) | Sporophytic(2n) | Data Source | reference | ||
| ! | Penstemon attenuatus Douglas ex Lindl. | Penstemon attenuatus Douglas ex Lindl. | ~24 | Fedorov, 1974 | Clausen J. et al. 1940b | ||
| ! | Penstemon attenuatus Douglas ex Lindl. | Penstemon attenuatus Douglas ex Lindl. | 48 | Fedorov, 1974 | Keck 1945 | ||
| ! | Penstemon attenuatus Douglas ex Lindl. | Penstemon attenuatus Douglas ex Lindl. | 48 | Darlington, 1955 | Keck 1945 |