Distribution: Occurring east of the Cascades crest in northeastern Washington; south-central British Columbia to northern Oregon and western Idaho.
Habitat: Ditches, canals, wet pastures, and marshes.
Flowers: June-August
Origin: Introduced from eastern North America
Growth Duration: Perennial
Conservation Status: Not of concern
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PNW Herbaria: Specimen records of Juncus pylaei in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Juncus pylaei checklist entry
OregonFlora: Juncus pylaei information
E-Flora BC: Juncus pylaei atlas page
CalPhotos: Juncus pylaei photos