⚠ Version 1 of The Plant List has been superseded.
This name is in version 1.1 of The Plant List, record tro-4102306, 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 4102306) with original publication details: Rhodora 42(494): 27 27 1940.
Full publication details for this name can be found in IPNI: urn:lsid:ipni.org:names:222156-2.