Distribution: Occurring on both sides of the Cascades crest in Washington; British Columbia to California, east to Idaho and Montana.
Habitat: Shores, peatlands, wet meadows, and ditches.
Flowers: June-August
Origin: Native
Growth Duration: Perennial
Conservation Status: Not of concern
Pollination: Wind
Tufted or clumping perennials, 5-25 cm, from heavy, long, creeping rhizome; stems erect and somewhat flattened.
Basal leaves 2-5, cauline leaves 2-4; auricles absent or, when present, 0.5-1.5 mm, apex acute; blade flat, 5-15 cm long and 2-3 mm wide.
Condensed cymes, 1-6, each with 3-7 flowers, open to aggregate, 2-6 cm; primary bract or distal leaves typically longer than inflorescence.
Tepals usually brown, ovate-oblong, 3-4 mm, margins scarious, inner whorl slightly short and minutely papillate; stamens 6, filaments 0.8-1.4 mm, anthers 0.8-1.4 mm; style 1mm.
Capsules 3-chambered, narrowly ovoid, 4-5 mm; seeds narrowly ovoid, 0.3 mm, tails absent.
PNW Herbaria: Specimen records of Juncus covillei in the Consortium of Pacific Northwest Herbaria database
WA Flora Checklist: Juncus covillei checklist entry
OregonFlora: Juncus covillei information
E-Flora BC: Juncus covillei atlas page
CalPhotos: Juncus covillei photos