Distribution: Occurring chiefly west of the Cascades crest in Washington; British Columbia to California, east to Idaho.
Habitat: Generally saline soil, damp dunes, salt marshes, swales, pools, and ditches.
Flowers: June-September
Origin: Introduced from Europe
Conservation Status: Not of concern
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PNW Herbaria: Specimen records of Juncus bufonius var. congestus in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Juncus bufonius var. congestus checklist entry
OregonFlora: Juncus bufonius var. congestus information
E-Flora BC: Juncus bufonius var. congestus atlas page
CalPhotos: Juncus bufonius var. congestus photos