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: Enum. Pl. Volh. 83 1822.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:284532-1.
This name was in version 1 of The Plant List, record kew-2834765.