Distribution: Occurring east of the Cascades crest in Washington, where disjunct; also in Boise County, Idaho, otherwise south-central Oregon to California and northern Nevada.
Habitat: Stream banks, floodplains, moist depressions
Flowers: May-July
Origin: Native
Growth Duration: Annual
Conservation Status: Threatened in Washington (WANHP)
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PNW Herbaria: Specimen records of Juncus tiehmii in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Juncus tiehmii checklist entry
OregonFlora: Juncus tiehmii information
E-Flora BC: Juncus tiehmii atlas page
CalPhotos: Juncus tiehmii photos