| Name | Pseudotrillium rivale (S. Watson) S. B. Farmer |
| Authorship | (S. Watson) S. B. Farmer |
| Rank | Species |
| Placed in | Pseudotrillium S. B. Farmer |
| Citation | 2002 Syst. Bot. 27(4): 687 |
| Holdings | 2 Specimens held in the Harvard University Herbaria identified as Pseudotrillium rivale (S. Watson) S. B. Farmer |
| Identification made in | 2007 (2) |