This name is a synonym of Sinapis alba subsp. mairei (H.Lindb.) Maire.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Itin. Medit. 65 1932.
This name was in version 1 of The Plant List, record kew-2476509, and has not been changed.