This name is a synonym of Rumex graminifolius Georgi ex Lamb..
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Enum. Pl. Nov. 519 1854.
This name was in version 1 of The Plant List, record kew-2869548, and has not been changed.