Atlas of North European vascular plants
Hultén & Fries 1986
663 Rumex arcticus Trautv.
This arctic species is closely related to R. aquaticus subsp. aquaticus and subsp. fenestratus (cf. Hultén, Circumpol. Il, p. 16) on map 662. It belongs to the disjunctly circumpolar plants (op. cit. p. 16 and map 7).