This name is a synonym of Brassica elongata Ehrh..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50297568) with original publication details: Exkurs.-Fl. Bayern 223 1884.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:289325-1.
This name was in version 1 of The Plant List, record tro-50297568.