1571 Callitriche palustris L.

Syn.: C. verna L.

This widespread species belongs to the circumpolar plants (Hultén, Circumpol. II, p. 114 and map 106). The distribution is still incompletely known, especially concerning Eurasia, for instance SE. Europe. Cf. also Meusel et al. 1978, map p. 272.