This name is a synonym of Rorippa barbareifolia (DC.) Kitag..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 4102305) with original publication details: Great Basin Naturalist 28(3): 152 1968.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:222149-2.
This name was in version 1 of The Plant List, record tro-4102305.