This name is a synonym of Brassica elongata subsp. subscaposa (Maire & Weiller) Maire.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Bull. Soc. Hist. Nat. Afrique N. 31: 9 1940.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:279537-1.
This name was in version 1 of The Plant List, record kew-2682830, and has not been changed.