| Name | Jamesia americana var. macrocalyx (Small) Engler |
| Authorship | (Small) Engler |
| Rank | Variety |
| Placed in | Jamesia americana Torrey & A. Gray |
| Citation | 1930 Nat. Pflanzenfam. [Engler & Prantl] 18a: 196 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Jamesia americana var. macrocalyx (Small) Engler |
| Identification made in | 1989 (3) |
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