Page author: Don Knoke
Juncus effusus

Distribution: Alaska to Baja California, east to Newfoundland and most of central and eastern United States.

Habitat: Moist areas, from coastal tideflats to mountain meadows and ridges.

Flowers: June - August

Origin: Both native and introduced

Growth Duration: Perennial

Conservation Status: Not of concern


Strongly tufted perennial with stout rhizomes, the stems terete, 2-10 dm. tall, finely grooved, 1.5-3 mm. thick.


Leaves bladeless or with a short, awn-like blade; leaf bases sheathing, the sheaths pale to deep brown, 5-12 cm. long.


Inflorescence apparently lateral, the involucral bract terete and resembling the stem, 5-20 cm. long, up to 1/3 the length of the stem; flowers numerous in a subcapitate to diffuse panicle up to 15 cm. long; perianth 2.5-3.5 mm. long, the 6 segments narrowly lanceolate; stamens 3, opposite the outer tepals.


Capsule equal to the perianth, obovoid but three-angled above, flat on the end.

Accepted Name:
Juncus effusus L.
Publication: Sp. Pl. 1: 326. 1753.

Synonyms & Misapplications:
(none provided)
ssp. effusus – soft rush
ssp. pacificus – common rush, Pacific rush
ssp. solutus – eastern soft rush
Additional Resources:

PNW Herbaria: Specimen records of Juncus effusus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Juncus effusus checklist entry.

E-Flora BC: Juncus effusus atlas page.

CalPhotos: Juncus effusus photos.

USDA Plants: Juncus effusus information.

57 photographs:
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