⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-4101441, with some changes.
This name is a synonym of Rorippa palustris var. occidentalis (S. Watson) Rollins.
The record derives from Tropicos which reports it as a synonym (record 4101441) with original publication details: Ill. Fl. Pacific States 2: 278 278 1944.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:222182-2.