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.

Flowers: June - August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Small aquatic herbs, the stems 5-20 cm. long, submerged or partially floating; leaf bases joined by small, winged ridges.


Submerged leaves linear, 5-20 mm. long, thin, 1-nerved, with a slight notch at the tip; floating and emergent leaves broadly spatulate, up to 4 mm. broad, 3-nerved.


Flowers imperfect, sessile in the leaf axils, each consisting of a single pistil or 1 stamen or both; styles 2, distinct, 1-2.5 mm. long, deciduous; floral bracts present.


Carpels 2, oblong-obovate, about 1 mm. long and 0.7 mm. broad, with pit-like markings in vertical lines.

Accepted Name:
Callitriche palustris L.

Synonyms & Misapplications:
Callitriche verna L. [HC]
Additional Resources:

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

WA Flora Checklist: Callitriche palustris checklist entry.

OregonFlora: Callitriche palustris information.

E-Flora BC: Callitriche palustris atlas page.

CalPhotos: Callitriche palustris photos.

USDA Plants: Callitriche palustris information.

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