This name is a synonym of Rumex acetosella subsp. acetoselloides (Balansa) Den Nijs.
The record derives from WCSP (in review)
(data supplied on 2012-03-23)
which reports it as a synonym with original publication details: Bull. Soc. Bot. France 1: 282 1854.
This name was in version 1 of The Plant List, record kew-2424181, and has not been changed.