| Name | Penstemon angustifolius subsp. caudatus (A. Heller) D. D. Keck |
| Authorship | (A. Heller) D. D. Keck |
| Rank | Subspecies |
| Placed in | Penstemon angustifolius Nuttall ex Pursh |
| Citation | 1939 J. Wash. Acad. Sci. 29: 490 |
| Holdings | 25 Specimens held in the Harvard University Herbaria identified as Penstemon angustifolius subsp. caudatus (A. Heller) D. D. Keck |
| Identification made in | [no date] (20), 1930 (1), 1937 (4) |
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