Heterotypic synonym according to GBIF classification (Originally found in sources as synonym of Rumex acetosella subsp. acetoselloides (Bal.) J.C.M.Den Nijs)
Rumex acetosella f. tenuifolius Wallr.
Doubtful according to GBIF classification (Possible variant of Rumex acetosella subsp. tenuifolius (Wallr.) O.Schwarz)