Callitriche
water-starwort
6 species
3 subspecies and varieties
3 subspecies and varieties
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Callitriche hermaphroditica – autumn 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
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 heterophylla – different-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
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 marginata – winged 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
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 palustris – spring 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
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 stagnalis – pond 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
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
