This name is a synonym of Brassica repanda subsp. africana (Maire) Greuter & Burdet.
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): 73 1919.
This name was in version 1 of The Plant List, record kew-2682448.