1345 Elatine hydropiper L.

This species (incl. E. orthosperma Düben) occurs in large parts of Europe and, perhaps infrequently, in Asia. Its occurrence, especially in Asia, is incompletely known. For the distribution in N. Europe, see Uotila in Mem. Soc. F. Fl. Fenn. 50/1974, p. 114 ff. Uotila has also published a map of the distribution of E. orthosperma in Fennoscandia (1. cit.).