This name is a synonym of Brassica repanda subsp. galissieri (Girard) Heywood.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Pflanzenr. IV, 105(70): 72 1919.
This name was in version 1 of The Plant List, record kew-2682791, and has not been changed.