1572 Callitriche hamulata Ktitz.

Syn.: C. intermedia Hoffm.

This species belongs to the amphi-atlantic plants (Hultén, Amphi-atl., p. 100 and map 81). The distribution is incompletely known. The species has been introduced into New Zealand. Cf. also Meusel et al. 1978, map p. 273.