| Name | Calystegia spithamaea subsp. purshiana (Wherry) Brummitt |
| Authorship | (Wherry) Brummitt |
| Rank | Subspecies |
| Placed in | Calystegia spithamaea (Linnaeus) Pursh |
| Citation | 1965 Ann. Missouri Bot. Gard. 52(2): 215 |
| Holdings | 28 Specimens held in the Harvard University Herbaria identified as Calystegia spithamaea subsp. purshiana (Wherry) Brummitt |
| Identification made in | [no date] (28) |
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