Callitriche heterophylla
different-leaved water-starwort

Distribution: North and South America and Greenland.

Habitat: Sloughs and slow-moving, fresh water.

Flowers: April - July

Origin: Native

Growth Duration: Annual, Perennial

Conservation Status: Not of concern


Small aquatic herbs, the stems 0.5-4 dm. long, emersed to emergent, with small, membranous ridges between the leaf bases.


Emersed leaves linear, 1-nerved, 0.5-2.5 mm. long; floating and emergent leaves broadly obovate, 3-nerved, up to 1 cm. wide.


Flowers imperfect, sessile in the leaf axils, each consisting of a single pistil or 1 stamen or both; styles 2, distinct, 1-5 mm. long, persistent; floral bracts present.


Carpels 2, obovate, 0.7-1.2 mm. long and broad, wingless, pitted with small, shallow pits.

Accepted Name:
Callitriche heterophylla Pursh

Synonyms & Misapplications:
(none provided)
var. bolanderi – Bolander's different-leaved water-starwort
Additional Resources:

PNW Herbaria: Specimen records of Callitriche heterophylla in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Callitriche heterophylla checklist entry.

E-Flora BC: Callitriche heterophylla atlas page.

CalPhotos: Callitriche heterophylla photos.

USDA Plants: Callitriche heterophylla information.

18 photographs:
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