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 4102782) with original publication details: Rhodora 42(494): 28 1940.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:222153-2.
This name was in version 1 of The Plant List, record tro-4102782.