| Name | Penstemon cardinalis var. regalis (A. Nelson) C. C. Freeman |
| Authorship | (A. Nelson) C. C. Freeman |
| Rank | Variety |
| Placed in | Penstemon cardinalis Wooton & Standley |
| Citation | 2017 PhytoKeys 80: 34 |
| Holdings | 5 Specimens held in the Harvard University Herbaria identified as Penstemon cardinalis var. regalis (A. Nelson) C. C. Freeman |
| Identification made in | 1974 (5) |
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