This name is a synonym of Brassica barrelieri (L.) Janka.
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50232218) with original publication details: Mant. Pl. 255 1771.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:324700-2.
This name was in version 1 of The Plant List, record tro-50232218, and has not been changed.