This name is a synonym of Rumex thyrsiflorus Fingerh..
The record derives from Tropicos
(data supplied on 2012-04-18)
which reports it as a synonym (record 50136022) with original publication details: Diagn. Pl. Nov. Mandshur. 2, pl. 1, f. 8 1943.
This name was in version 1 of The Plant List, record tro-50136022, and has not been changed.