Burke: Callitriche palustris vs. Callitriche stenoptera

	Callitriche palustris	Callitriche stenoptera
	spring water-starwort, vernal water-starwort
Habit	Small aquatic herbs, the stems 5-20 cm. long, submerged or partially floating; leaf bases joined by small, winged ridges.
Leaves	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	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.
Fruits	Carpels 2, oblong-obovate, about 1 mm. long and 0.7 mm. broad, with pit-like markings in vertical lines.

	Callitriche palustris	Callitriche stenoptera
Flowering time	June-August
Habitat	Sloughs and slow-moving fresh water.
Distribution	Occurring on both sides of the Cascades crest in Washington; Alaska to California, east across most of North America to the Atlantic Coast. [WildflowerSearch map] [BONAP county map]	[BONAP county map]
Origin	Native
Conservation status	Not of concern
Sibling taxa	C. brutia, C. hermaphroditica, C. heterophylla, C. marginata, C. stagnalis	C. brutia, C. hermaphroditica, C. heterophylla, C. marginata, C. palustris, C. stagnalis
Web links	Local floras: BC, CA, OR, WA Local Web sites: CalFlora, CalPhotos, Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search	Local floras: BC, OR Local Web sites: Flora NW, PNW Herbaria WildflowerSearch iNaturalist (observations) USDA Plants Database LBJ Wildflower Center SEINet Plants of the World Online Encyclopedia of Life Wikipedia Google Image Search

Callitriche palustris

Callitriche stenoptera

spring water-starwort, vernal water-starwort

Habit

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

Leaves

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

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.

Fruits

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