Autumn Water-starwort, Autumnal Water Starwort, Northern Water-starwort, Northern Water Starwort: Callitriche hermaphroditica (Synonyms: Callitriche autumnalis, Callitriche fassettii, Callitriche hermaphroditica ssp. hermaphroditica) - This is considered Callitriche fassettii in Oregon.
Bolander's Different-leaved Water-starwort, Bolander's Water Starwort, Bolander's Water-starwort, Different-leaved Water Starwort, Two-headed Water-starwort: Callitriche heterophylla var. bolanderi (Synonyms: Callitriche bolanderi, Callitriche heterophylla ssp. bolanderi) -
Winged Water-starwort: Callitriche marginata (Synonym: Callitriche sepulta) -
Spring Water-starwort, Spring Water Starwort, Vernal Water-starwort, Vernal Water Starwort: Callitriche palustris (Synonyms: Callitriche anceps, Callitriche palustris var. verna, Callitriche verna) -
Pond Water-starwort: Callitriche stagnalis -