Distribution: Occurring on both sides of the Cascades crest along the coast in Washington; British Columbia to Oregon, scattered eastward across North America to the Atlantic Coast.
Habitat: Often near cranberry farms, on sandy and peaty shores or ditches,
Flowers: June-August
Origin: Native in interior Washington, introduced along the coast.
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Wind
[none provided]
PNW Herbaria: Specimen records of Juncus tweedyi in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Juncus tweedyi checklist entry
OregonFlora: Juncus tweedyi information
E-Flora BC: Juncus tweedyi atlas page
CalPhotos: Juncus tweedyi photos