Rorippa palustris var. occidentalis (S. Watson) Rollins in Harvard Pap. Bot. 1(4): 48. 1993 sec. Rollins 1993
- ≡Nasturtium terrestre var. occidentale S. Watson, Syn. Fl. N. Amer. 1(1[1]): 148. 1895 syn. sec. Rollins 1993
- =Rorippa pacifica Howell, Fl. N.W. Amer. [Howell] 1: 40. 1897 syn. sec. Rollins 1993
- =Rorippa clavata Rydb. in Bull. Torrey Bot. Club 29(4): 235. 1902 syn. sec. Rollins 1993
- =Radicula pacifica (Howell) Greene in Leafl. Bot. Observ. Crit. 1(9): 114. 1905 syn. sec. Rollins 1993
- =Nasturtium clavatum (Rydb.) Standl. in Publ. Field Mus. Nat. Hist., Bot. Ser. 8(5): 312. 1931 syn. sec. Rollins 1993
- =Rorippa palustris var. pacifica (Howell) G.N. Jones in Univ. Wash. Publ. Biol. 5: 161. 1936 syn. sec. Rollins 1993
- =Rorippa islandica var. occidentalis (S. Watson) Butters & Abbe in Rhodora 42(494): 27. 1940 syn. sec. Rollins 1993
- =Rorippa palustris subsp. occidentalis (S. Watson ex A. Gray) Abrams, Ill. Fl. Pacific States 2: 278. 1944 syn. sec. Rollins 1993