Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to Montana; also in eastern North America.
Habitat: In streams, ponds, and ditches.
Flowers: May-August
Origin: Introduced from Europe
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Wind
Small aquatic herbs, the stems 3-15 cm. long, aquatic to terrestrial; leaf bases joined by small, winged ridges.
Leaves from linear and 1-nerved to broadly obovate-spatulate and 3- to 5-nerved, and nearly 1 cm. broad.
Flowers imperfect, sessile in the leaf axils, each consisting of a single pistil or 1 stamen or both; styles 2, distinct, 1-3 mm. long, reflexed to erect, deciduous; floral bracts conspicuous, white.
Carpels 2, round to oblong-oval, 1-1.5 mm. long, conspicuously wing-margined all around.
Publication: Fl. Carniol., ed. 2. 2: 251. 1771.
PNW Herbaria: Specimen records of Callitriche stagnalis in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Callitriche stagnalis checklist entry
OregonFlora: Callitriche stagnalis information
E-Flora BC: Callitriche stagnalis atlas page
CalPhotos: Callitriche stagnalis photos
