Page authors: Don Knoke, David Giblin
Achnatherum hymenoides
Indian rice grass

Distribution: East of the Cascades in Washington; British Columbia south to California, east to Alberta and the Dakotas and Texas.

Habitat: Grasslands, desert plains, and foothills, especially on rocky or sandy soil.

Flowers: May-June

Origin: Native

Conservation Status: Not of concern


Strongly tufted perennial 3-6 dm. tall, the culms thick-walled, but hollow.


Sheaths open, glabrous to puberulent; ligules about 6 mm. long, entire to lacerate, acuminate; blades elongate, strongly involute, about 1 mm. wide.


Inflorescence an open panicle 8-16 cm. long, the branches spreading and dichotomously branched, the pedicles filiform; spikelets 1-flowered, articulate above the glumes; glumes ovate-acuminate, 3-nerved, subglabrous, 5-9 mm. long, subequal; lemmas dark, 3-4 mm. long, copiously hairy, with a stout awn 4-6 mm. long; stamens 3, the anthers with a tuft of hair at the tip; lodicules 3, 2 mm. long, two broadly wedge-shaped, the third rhombic.



Accepted Name:
Achnatherum hymenoides (Roem. & Schult.) Barkworth
Publication: Phytologia 74(1): 7-8. 1993.

Synonyms & Misapplications:
Eriocoma cuspidata Nutt.
Oryzopsis hymenoides (Roem. & Schult.) Ricker ex Piper [HC]
Stipa hymenoides Roem. & Schult.
Additional Resources:

PNW Herbaria: Specimen records of Achnatherum hymenoides in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Achnatherum hymenoides checklist entry.

E-Flora BC: Achnatherum hymenoides atlas page.

CalPhotos: Achnatherum hymenoides photos.

USDA Plants: Achnatherum hymenoides information.

18 photographs:
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