| Name | Penstemon ambiguus var. thurberi (Torrey) A. Gray |
| Authorship | (Torrey) A. Gray |
| Rank | Variety |
| Placed in | Penstemon ambiguus Torrey |
| Citation | 1862 Proc. Amer. Acad. Arts 6: 65 |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Penstemon ambiguus var. thurberi (Torrey) A. Gray |
| Identification made in | [no date] (1) |
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