| Name | Penstemon diphyllus Rydberg |
| Authorship | Rydberg |
| Rank | Species |
| Placed in | Penstemon Schmidel |
| Citation | 1900 Mem. New York Bot. Gard. 1: 349 |
| Holdings | 21 Specimens held in the Harvard University Herbaria identified as Penstemon diphyllus Rydberg |
| Identification made in | [no date] (21) |
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