This name is a synonym of Rorippa clandestina (Spreng.) J.F. Macbr..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 4101589) with original publication details: Repert. Spec. Nov. Regni Veg. 33: 278 1934.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:167286-2.
This name was in version 1 of The Plant List, record tro-4101589.