This name is a synonym of Rorippa palustris (L.) Besser.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 4101441) with original publication details: Ill. Fl. Pacific States 2: 278 1944.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:1136772-2.
This name was in version 1 of The Plant List, record tro-4101441.