This name is a synonym of Brassica repanda subsp. confusa (Emb. & Maire) Heywood.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Nouv. Mat. Fl. Atl. 2: 361 1875.
This name was in version 1 of The Plant List, record kew-2682442, and has not been changed.