| Name | Penstemon angustifolius var. caudatus (A. Heller) Rydberg |
| Authorship | (A. Heller) Rydberg |
| Rank | Variety |
| NomenclaturalStatus | Unknown |
| Placed in | Penstemon angustifolius Nuttall ex Pursh |
| Holdings | 1 Specimen held in the Harvard University Herbaria identified as Penstemon angustifolius var. caudatus (A. Heller) Rydberg |
| Identification made in | [no date] (1) |
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