Juncus covillei
Coville's rush

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.

Fruits :

Capsules 3-chambered, narrowly ovoid, 4-5 mm; seeds narrowly ovoid, 0.3 mm, tails absent.

Accepted Name:
Juncus covillei Piper
Publication: Contributions from the U. S. National Herbarium. 11: 182. 1906.

Synonyms & Misapplications:
Juncus covillei Piper var. covillei [FNA22, HC]
Juncus covillei Piper var. obtusatus C.L. Hitchc. [FNA22, HC]
Juncus falcatus E. Mey. var. paniculatus Engelm.
Juncus falcatus E. Mey. var. prominens Buchenau
Juncus latifolius (Engelm.) Buchenau var. paniculatus (Engelm.) Buchenau
Juncus obtusatus Engelm., homonym (illegitimate)
Additional Resources:

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

13 photographs:
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