667 Rumex crispus L.

This widespread species originates from Eurasia. The lack of known localities in C. Asia seems to reflect the actual situation. It has been introduced and naturalized in Japan (besides the native R. japonicus Houtt.) and other parts of E. Asia, in N. America (the area schematically indicated) and in other places around the world. With its present distribution the species may be, in spite of discontinuities, referred to the circumpolar plants (Hultén, Circumpol. Il, p. 268 and map 260).