1373 Myriophyllum verticillatum L.

This variable aquatic plant is widely distributed in Eurasia and N. America. Same lower taxa are distinguished (cf. Fernald, Manual 1950, p. 1074). The species s. lat. belongs to the circumpolar plants (Hultén, Circumpol Il, p. 120, 348 and map 112). It is considered native in S. America. Cf. also Meusel et al. 1978, map p. 302.