Page author: Don Knoke
Juncus nodosus
knotted rish, tuberous rush

Distribution: East of the Cascades, British Columbia to California, east to Nova Scotia and Maine.

Habitat: Ditches, ponds and wet places.

Flowers: Late June - August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Perennial from slender rhizomes, the stems 1.5-4 dm. tall, arising singly from swollen nodes.


Leaves alternate, 1-3, the blades semi-terete, with prominent partitions; leaf bases sheathing, the sheaths projecting into rounded auricles 1 mm. long.


Inflorescence terminal, up to 5 cm. long, exceeded by the upper leaf and the involucral bract; heads 3-15, many-flowered, up to 1 cm. long; perianth about 3.5 mm. long, greenish-brown to tawny, the 6 segments narrowly lanceolate, acuminate and somewhat awl-shaped, subequal; stamens 6.


Capsule conic, tapered almost from the base to a long beak that much exceeds the perianth.

Accepted Name:
Juncus nodosus L.
Publication: Sp. Pl., ed. 2. 1: 466. 1762. 1762.

Synonyms & Misapplications:
Juncus nodosus L. var. meridionalis F.J. Herm.
Juncus nodosus L. var. nodosus [KZ99]
Juncus rostkovii E. Mey.
Additional Resources:

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

WA Flora Checklist: Juncus nodosus checklist entry.

E-Flora BC: Juncus nodosus atlas page.

CalPhotos: Juncus nodosus photos.

USDA Plants: Juncus nodosus information.

20 photographs:
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