This name is a synonym of Rumex obtusifolius subsp. transiens (Simonk.) Rech.f..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Consp. Fl. Gallic. Crit. 2: 107 1908.
This name was in version 1 of The Plant List, record kew-2869570, and has not been changed.