Distribution: Occurring west of the Cascades crest in western Washington; Alaska to northwest Washington, east to the Canadian Great Plains, Great Lakes region.
Habitat: Tidal flats, lakes, peatlands, and ditches.
Flowers: June-September
Origin: Native
Growth Duration: Perennial
Conservation Status: Sensitive in Washington (WANHP)
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PNW Herbaria: Specimen records of Eleocharis mamillata in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Eleocharis mamillata checklist entry
OregonFlora: Eleocharis mamillata information
E-Flora BC: Eleocharis mamillata atlas page
CalPhotos: Eleocharis mamillata photos