This name is a synonym of Rumex acetosa subsp. hibernicus (Rech.f.) Akeroyd.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Watsonia 5: 65 1961.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:697187-1.
This name was in version 1 of The Plant List, record kew-2424082, and has not been changed.