This name is a synonym of Brassica fruticulosa subsp. radicata (Desf.) Batt..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Comp. Fl. Atlant. 2: 191 1885.
This name was in version 1 of The Plant List, record kew-2682241, and has not been changed.