Page authors: Don Knoke, David Giblin
Cyperus esculentus
yellow nut-grass
WTU specimens
Other herbaria

Distribution: Widely distributed throughout Washington; widespread throughout North America.

Habitat: Moist, low ground along streams and ditches, but sometimes in drier ground.

Flowers: June-August

Origin: Native

Conservation Status: Not of concern

Description:
General:

Herbaceous, sweet-scented perennial, the sharply triangular, solid stems 1-7 dm. tall, arising singly from slender rhizomes that terminate in small tubers.

Leaves:

Leaves grass-like, clustered at the base, the elongate blade 3-8 mm. wide, the sheaths closed; involucre bracts elongate, unequal, sometimes longer than the leaves.

Flowers:

Spikelets in open, cylindric spikes, the terminal spike or cluster of spikes sessile, the others single or in small groups on rays up to 7 cm. long; spikelets slender, 0.5-5 cm. long and 1-2 mm. wide; scales of the spikelets in two vertical rows, 2.5-3 mm. long, several nerved, broad and overlapping laterally, but not closely set; perianth none; stamens 3; style trifid.

Fruits:

Achenes unequally triangular, 1.3-2 mm. long.

Accepted Name:
Cyperus esculentus L.
Publication: Sp. Pl. 1: 45. 1753.

Synonyms & Misapplications:
(none provided)
Infraspecies:
var. leptostachyus – yellow nut-grass
Additional Resources:

PNW Herbaria: Specimen records of Cyperus esculentus in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Cyperus esculentus checklist entry.

E-Flora BC: Cyperus esculentus atlas page.

CalPhotos: Cyperus esculentus photos.

USDA Plants: Cyperus esculentus information.

21 photographs:
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