| Name | Penstemon laxiflorus Pennell |
| Authorship | Pennell |
| Rank | Species |
| Placed in | Penstemon Schmidel |
| Holdings | 72 Specimens held in the Harvard University Herbaria identified as Penstemon laxiflorus Pennell |
| Identification made in | [no date] (45), 1932 (1), 1934 (1), 1937 (9), 1939 (7), 1941 (1), 1961 (6), 1965 (1), 1969 (1) |
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