| Name | Penstemon oklahomensis Pennell |
| Authorship | Pennell |
| Rank | Species |
| Placed in | Penstemon Schmidel |
| Holdings | 7 Specimens held in the Harvard University Herbaria identified as Penstemon oklahomensis Pennell |
| Identification made in | [no date] (3), 1931 (3), 1969 (1) |
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