| Name | Rorippa palustris subsp. occidentalis (S. Watson) Abrams |
| Authorship | (S. Watson) Abrams |
| Rank | Subspecies |
| Placed in | Rorippa palustris (Linnaeus) Besser |
| Citation | 1944 Ill. Fl. Pacific States 2: 278 |
| Holdings | 33 Specimens held in the Harvard University Herbaria identified as Rorippa palustris subsp. occidentalis (S. Watson) Abrams |
| Identification made in | [no date] (29), 1972 (4) |