Distribution: Occurring chiefly east of the Cascades crest in Washington; Washington to the Rocky Mountains, Great Plains, Great Lakes region, and northeastern North America.
Habitat: Sandy lakeshores and riverbanks.
Flowers: July-September
Origin: Native east Cascades, introduced in Seattle, WA
Growth Duration: Perennial
Conservation Status: Not of concern
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PNW Herbaria: Specimen records of Cyperus schweinitzii in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Cyperus schweinitzii checklist entry
OregonFlora: Cyperus schweinitzii information
E-Flora BC: Cyperus schweinitzii atlas page
CalPhotos: Cyperus schweinitzii photos