| Name | Penstemon unilateralis Rydberg |
| Authorship | Rydberg |
| Rank | Species |
| Placed in | Penstemon Schmidel |
| Citation | 1906 Bull. Torrey Bot. Club 33: 150 |
| Holdings | 47 Specimens held in the Harvard University Herbaria identified as Penstemon unilateralis Rydberg |
| Identification made in | [no date] (28), 1921 (1), 1930 (18) |
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