Page authors: Don Knoke, David Giblin
Schoenoplectus subterminalis
swaying clubrush, water clubrush

Distribution: Occurring chiefly west of the Cascades crest; Alaska to California, east to Montana, Idaho, and Utah, also from northern Great Plains east to the Atlantic Coast.

Habitat: Quiet, shallow water 2-8 dm. deep,

Flowers: July-August

Origin: Native

Growth Duration: Perennial

Conservation Status: Not of concern


Aquatic perennials from rhizomes, the slender, weak, sub-terete stems 20-80 cm. long.


Leaves elongate, weak, from near the base, the upper portion usually floating, or the plant occasionally terrestrial with erect stem and leaves.


Inflorescence a solitary, light brown spikelet 7-12 mm. long, subtended by a bract 1.5-6 cm. long that looks like a continuation of the stem; flowers subtended by thin translucent scales 4-6 mm. long; perianth of 2-6 bristles about equal to the achene; stamens 3; style trifid.


Achenes triangular, 2.5-3.8 mm. long, including the slender beak.

Accepted Name:
Schoenoplectus subterminalis (Torr.) Soják
Publication: Cas. Nár. Mus., Odd. Prír. 140: 127. 1972.

Synonyms & Misapplications:
Scirpus subterminalis Torr. [HC]
Additional Resources:

PNW Herbaria: Specimen records of Schoenoplectus subterminalis in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Schoenoplectus subterminalis checklist entry.

E-Flora BC: Schoenoplectus subterminalis atlas page.

CalPhotos: Schoenoplectus subterminalis photos.

USDA Plants: Schoenoplectus subterminalis information.

25 photographs:
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