Page authors: Don Knoke, David Giblin
Cyperus squarrosus
awned flatsedge

Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to the Atlantic Coast.

Habitat: Lake and pond shores, banks of slow moving streams and rivers, and other wet, open areas at low to middle elevations.

Flowers: June-September

Origin: Native

Conservation Status: Not of concern


Tufted, sweet-scented annual, the triangular, solid, slender stems 0.3-1.5 dm. tall.


Leaves few, grass-like, all near the base, as long or longer than the culms, 0.5-2 mm. wide; involucral bracts much surpassing the inflorescence.


Spikelets in dense, capitate clusters, the terminal cluster sessile, the others on slender rays up to 3 cm. long; spikelets 4-10 mm. long, flattened; scales of the spikelets in two vertical rows, 7- to 9-nerved, 1.0-1.7 mm. long, with a recurved awn tip 0.3-1.0 mm. long; stamen solitary; style trifid.


Achenes triangular, 0.6-1.0 mm. long.

Accepted Name:
Cyperus squarrosus L.
Publication: Cent. Pl. II. 6. 1756.

Synonyms & Misapplications:
Chlorocyperus inflexus (Muhl.) Palla
Cyperus aristatus Rottb. [HC]
Cyperus aristatus Rottb. var. runyonii O’Neill
Cyperus inflexus Muhl.
Dichostylis aristata (Rottb.) Palla
Mariscus squarrosus (L.) C.B. Clarke
Additional Resources:

PNW Herbaria: Specimen records of Cyperus squarrosus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Cyperus squarrosus checklist entry.

E-Flora BC: Cyperus squarrosus atlas page.

CalPhotos: Cyperus squarrosus photos.

USDA Plants: Cyperus squarrosus information.

23 photographs:
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