6 species
3 subspecies and varieties
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Callitriche brutianarrow-leaf water-starwort
Origin: Native
Callitriche hermaphroditicaautumn water-starwort, northern water-starwort
Distribution: Across northern North America, south to central California, northern New Mexico, the Great Lakes, and northeast United States.
Habitat: Sloughs and streams.
Origin: Native
Flowers: July - September
Growth Duration: perennial
Callitriche heterophylladifferent-leaved water-starwort
Distribution: North and South America and Greenland.
Habitat: Sloughs and slow-moving, fresh water.
Origin: Native
Flowers: April - July
Growth Duration: annual, perennial
var. bolanderi – Bolander's different-leaved water-starwort
Callitriche marginatawinged water-starwort
Distribution: Reported from eastern counties in Washington; British Columbia south to California.
Habitat: Ponds, lakes, slow-moving streams.
Origin: Native
Flowers: July-August
Growth Duration: perennial
Callitriche palustrisspring water-starwort, vernal water-starwort
Distribution: General in North America except Mexico and south and southeast United States.
Habitat: Sloughs and slow-moving fresh water.
Origin: Native
Flowers: June - August
Growth Duration: perennial
Callitriche stagnalispond water-starwort
Distribution: Introduced in the Pacific Coast states, Montana, and some Eastern states
Habitat: Uncommon in streams, ponds and ditches
Origin: Introduced from Europe
Flowers: May - August
Growth Duration: perennial