Page authors: Don Knoke, David Giblin
Sparganium angustifolium
floating bur-reed, narrow-leaved bur-reed

Distribution: Occurring on both sides of the Cascades crest in Washington; Alaska to California, east to the Rocky Mountains.

Habitat: Ponds and shallow lakes at moderate elevations in the mountains.

Flowers: July-September

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Wind


Dioecious, aquatic perennials from rhizomes, the stems usually floating, 3-10 dm. long.


Leaves alternate, linear, slightly rounded on the back, 2-6 mm. broad, the upper ones sheathing at the base.


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.


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.
Publication: Flora Boreali-Americana. 2: 189. 1803.

Synonyms & Misapplications:
Sparganium angustifolium Michx. var. multipedunculatum (Morong) Brayshaw
Sparganium emersum Rehmann var. multipedunculatum (Morong) Reveal [HC]
Sparganium multipedunculatum (Morong) Rydb.
Sparganium simplex Huds. var. multipedunculatum Morong [VPPNW1]
Additional Resources:

PNW Herbaria: Specimen records of Sparganium angustifolium in the Consortium of Pacific Northwest Herbaria database

WA Flora Checklist: Sparganium angustifolium checklist entry

OregonFlora: Sparganium angustifolium information

E-Flora BC: Sparganium angustifolium atlas page

CalPhotos: Sparganium angustifolium photos

24 photographs:
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