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 50129869) with original publication details: Botany (Fortieth Parallel) 15 1871.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:167335-2.
This name was in version 1 of The Plant List, record tro-50129869, and has not been changed.