This name is a synonym of Rumex thyrsiflorus Fingerh..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Handb. Norges Fl. 285 1903.
This name was in version 1 of The Plant List, record kew-2869544, and has not been changed.