This name is a synonym of Rorippa alpina (S. Watson) Rydb..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 4101421) with original publication details: Sida 4(4): 346 1972.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:222129-2.
This name was in version 1 of The Plant List, record tro-4101421, and has not been changed.