Page author: Don Knoke
Sclerochloa dura
common hard grass

Distribution: Sparingly introduced in much of western United States; established in eastern Washington and Oregon.

Habitat: Weed of waste areas.

Flowers: June

Origin: Introduced

Growth Duration: Annual

Conservation Status: Not of concern

Pollination: Wind


Glabrous, low, spreading annual, the culms 3-9 cm. tall.


Sheaths partially closed, compressed; ligules 0.5-1.5 mm. long; blades involute, the tip somewhat boat-shaped.


Inflorescence a terminal, spikelike raceme 1-5 cm. long, exceeded by the upper leaves; spikelets 3-flowered, subsessile, closely crowded on one side of the rachis, 6-10 mm. long; first glume 2-3 mm. long, 3-nerved, rounded at the tip; second glume 4-6 mm. long, 7-nerved, rounded at the tip; lemmas compressed, 4-6 mm. long, with 5 non-convergent nerves; paleas much shorter than the lemmas, sharply 2-keeled.

Accepted Name:
Sclerochloa dura (L.) P. Beauv.
Publication: Ess. Agrostogr. 98, 174, 177, pl. 19, f. 4. 1812.

Synonyms & Misapplications:
Cynosurus durus L.
Additional Resources:

PNW Herbaria: Specimen records of Sclerochloa dura in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Sclerochloa dura checklist entry.

OregonFlora: Sclerochloa dura information.

E-Flora BC: Sclerochloa dura atlas page.

CalPhotos: Sclerochloa dura photos.

USDA Plants: Sclerochloa dura information.

20 photographs:
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