| Name | Penstemon tenuis Small |
| Authorship | Small |
| Rank | Species |
| Placed in | Penstemon Schmidel |
| Citation | 1903 Fl. S.E. U.S. [Small] 1061, 1337 |
| Holdings | 13 Specimens held in the Harvard University Herbaria identified as Penstemon tenuis Small |
| Identification made in | [no date] (11), 1931 (1), 2012 (1) |
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