Distribution: Occurring east of the Cascades crest in southern Washington; native to central and eastern North America.
Habitat: Emergent shorelines in sandy, peaty, or slightly brackish areas (though seldom where disturbed).
Flowers: June-August
Origin: Introduced from eastern and central North America
Growth Duration: Annual
Conservation Status: Not of concern
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PNW Herbaria: Specimen records of Cyperus diandrus in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Cyperus diandrus checklist entry
OregonFlora: Cyperus diandrus information
E-Flora BC: Cyperus diandrus atlas page
CalPhotos: Cyperus diandrus photos