Blooms: July-September
Habit: herb
Duration: perennial
Origin: Native
Conservation Status: Abundant; of no concern.
Distribution: Widely distributed in much of Washington; Alaska south to California, east to the Rocky Mountain states.
Habitat: Ponds and shallow lakes at moderate elevations in the mountains.
Habit: herb
Duration: perennial
Origin: Native
Conservation Status: Abundant; of no concern.
Distribution: Widely distributed in much of Washington; Alaska south to California, east to the Rocky Mountain states.
Habitat: Ponds and shallow lakes at moderate elevations in the mountains.
Species Description:
General: Dioecious, aquatic perennials from rhizomes, the stems usually floating, 3-10 dm. long.
Leaves: Leaves alternate, linear, slightly rounded on the back, 2-6 mm. broad, the upper ones sheathing at the base.
Flowers: Flowers in globose clusters toward the tip of the main stem; staminate heads up to 5, above the pistillate; pistillate heads 2-4, the lower 1-2 long stalked and borne in the axils of leaf-like bracts, up to 1.5 cm. thick; stamens 3-5 with 3-5 minute chaffy bracts, with long filaments; style 1, with a larger bract.
Fruits: Achenes spindle-shaped, about 2.5 mm. long, on a stipe 1-1.5 mm. long, and with a beak about 2 mm. long.
General: Dioecious, aquatic perennials from rhizomes, the stems usually floating, 3-10 dm. long.
Leaves: Leaves alternate, linear, slightly rounded on the back, 2-6 mm. broad, the upper ones sheathing at the base.
Flowers: Flowers in globose clusters toward the tip of the main stem; staminate heads up to 5, above the pistillate; pistillate heads 2-4, the lower 1-2 long stalked and borne in the axils of leaf-like bracts, up to 1.5 cm. thick; stamens 3-5 with 3-5 minute chaffy bracts, with long filaments; style 1, with a larger bract.
Fruits: Achenes spindle-shaped, about 2.5 mm. long, on a stipe 1-1.5 mm. long, and with a beak about 2 mm. long.
Accepted Name:
Sparganium angustifolium Michx.Synonyms:
Sparganium angustifolium Michaux var. multipedunculatum (Morong) Brayshaw
Sparganium emersum Rehmann var. multipedunculatum (Morong) Reveal
Sparganium multipedunculatum (Morong) Rydberg
Sparganium simplex Huds. var. multipedunculatum Morong
Treated in Flora of the PNW as:
Sparganium angustifolium, Sparganium emersum vars. emersum & multipedunculatum
Additional Resources:
PNW Herbaria Specimens: View list of Sparganium angustifolium specimens in the Consortium of Pacific Northwest Herbaria database.
WTU Herbarium Specimens: View list of Sparganium angustifolium specimens in the WTU Herbarium database.
Washington Flora Checklist: Sparganium angustifolium treatment.
E-Flora BC: Sparganium angustifolium atlas page.
CalPhotos: Sparganium angustifolium images.
USDA Plants Database: Sparganium angustifolium.
Ben Legler, 2004
Ben Legler, 2004
Bud Kovalchik
Bud Kovalchik
G. D. Carr, 2008
G. D. Carr, 2008
G. D. Carr, 2008
G. D. Carr, 2008
G. D. Carr, 2008
G. D. Carr, 2008
Robert Cummings, 2009
Clayton J. Antieau, 1991
Susan McDougall, 2004
Susan McDougall, 2004
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 WA Native Plant Society |
