75; see text Callitriche is a genus of largely aquatic plants known as water-starwort.

Previously, it was the only genus in the family Callitrichaceae.

However, according to the APG II system this family is now included in the Plantaginaceae (plantain family).

[1] The first molecular phylogeny of the aquatic genus of 50 species discerned three clades: Clade A (three species, widespread); Clade C (10 species, New World); Clade D (six species, Europe).

[3] The parsimony analyses revealed that aneuploid reduction (n=5 to 4) and polyploidy (n=5 to 10) have evolved at least twice in the genus, whereas the obligately submersed growth habit and hypohydrophily have evolved once.