| Name | Synthyris missurica subsp. major (Hooker) Pennell |
| Authorship | (Hooker) Pennell |
| Rank | Subspecies |
| Placed in | Synthyris missurica (Rafinesque) Pennell |
| Citation | 1933 Proc. Acad. Nat. Sci. Philadelphia 85: 91 |
| Holdings | 11 Specimens held in the Harvard University Herbaria identified as Synthyris missurica subsp. major (Hooker) Pennell |
| Identification made in | [no date] (11) |