| Name | Gentiana ×billingtonii Farwell |
| Authorship | Farwell |
| Rank | Species |
| Placed in | Gentiana Linnaeus |
| Citation | 1964 Trans. Wisconsin Acad. Sci. 53: 274 |
| Holdings | 3 Specimens held in the Harvard University Herbaria identified as Gentiana ×billingtonii Farwell |
| Identification made in | [no date] (2), 1967 (1) |