Page authors: Don Knoke, David Giblin
Juncus nodosus
knotted rush, tuberous rush
Specimens
Photos

Distribution: Occurring chiefly east of the Cascades crest in Washington; Alaska to California (not in Oregon), east across most of North America to the Atlantic Coast.

Habitat: Shores, wet meadows, springs, and ditches.

Flowers: June-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern

Pollination: Wind

Description:
General:

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

Leaves:

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

Flowers:

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.

Fruits:

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.

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

OregonFlora: Juncus nodosus information

E-Flora BC: Juncus nodosus atlas page

CalPhotos: Juncus nodosus photos

20 photographs:
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