This name is a synonym of Rumex acetosella subsp. pyrenaicus (Pourr. ex Lapeyr.) Akeroyd.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Revista Biol. (Lisbon) 12: 356 1984.
Full publication details for this name can be found in IPNI: http://ipni.org/urn:lsid:ipni.org:names:914543-1.
This name was in version 1 of The Plant List, record kew-2424155, and has not been changed.