Distribution: Occurring east of the Cascades crest in Washington; Washington to California, east to Idaho, Montana, and Nevada.
Habitat: Vernally damp meadows, springs, shores, moist open forests, and ditches.
Flowers: May-July
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
[none provided]
PNW Herbaria: Specimen records of Juncus trilocularis in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Juncus trilocularis checklist entry
OregonFlora: Juncus trilocularis information
E-Flora BC: Juncus trilocularis atlas page
CalPhotos: Juncus trilocularis photos