This name is a synonym of Brassica elongata Ehrh..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Ill. Fl. Mitt.-Eur. 4(38): 235 1918.
This name was in version 1 of The Plant List, record kew-2682198.