Originally in the family Callitrichaceae, the water-starworts are now placed in the Plantaginaceae.
Narrow-leaf Water-starwort: Callitriche brutia (Synonym: Callitriche brutia var. hamulata)
Autumn Water-starwort, Autumnal Water-starwort, Northern Water-starwort: Callitriche fassettii (Synonyms: Callitriche autumnalis, Callitriche hermaphroditica, Callitriche hermaphroditica ssp. hermaphroditica)
Bolander's Different-leaved Water-star-wort, Bolander's Water-starwort: Callitriche heterophylla var. bolanderi (Synonyms: Callitriche bolanderi, Callitriche heterophylla ssp. bolanderi)
Different-leaved Water-starwort: Callitriche heterophylla var. heterophylla (Synonyms: Callitriche anceps, Callitriche heterophylla ssp. heterophylla)
Winged Water-starwort: Callitriche marginata
Spring Water-starwort, Vernal Water-starwort: Callitriche palutris (Synonym: Callitriche verna)
Pond Water-starwort: Callitriche stagnalis
Wheel-fruited Water-starwort: Callitriche trochlearis