Distribution: Occurring chiefly along the Columbia River in Washington; Washington to California, east along the southern U.S. border to eastern North America.
Habitat: Riverbanks, seeps, and ditches.
Flowers: June-August
Origin: Introduced from Eurasia, northern Africa, and Australia
Growth Duration: Annual
Conservation Status: Not of concern
[none provided]
PNW Herbaria: Specimen records of Cyperus difformis in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Cyperus difformis checklist entry
OregonFlora: Cyperus difformis information
E-Flora BC: Cyperus difformis atlas page
CalPhotos: Cyperus difformis photos