This name is a synonym of Rumex bucephalophorus subsp. gallicus (Steinh.) Rchb.f..
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: 38 1940.
This name was in version 1 of The Plant List, record kew-2870895, and has not been changed.