Page author: Don Knoke
Hordeum murinum
mouse barley, smooth barley, wall barley

Distribution: Uncommon weed in the United States, occasional in southern British Columbia and western Washington.

Habitat: Disturbed soil and wasteland.

Flowers: June - July

Origin: Introduced

Growth Duration: Annual

Conservation Status: Not of concern

Pollination: Wind


Glabrous annual, the culms 2-4 dm. tall.


Sheaths open, glabrous; auricles well-developed, 1-2 mm. long; ligules barely 1 mm. long; blades 3-4 mm. broad, sparsely hairy.


Inflorescence a terminal spike 4-7 cm. long, sometimes partially enclosed in the inflated upper sheath; spikelets 3 per node, 1-flowered, all well developed; central spikelet sessile, the glumes 2-3 cm. long, broadened and long-hairy basally; lateral spikelets short-pedicillate, the glumes narrower than those of the central spikelet; rachilla of the lateral spikelets prolonged past the floret 2.5-3.5 mm., bristle-like.

Accepted Name:
Hordeum murinum L.

Synonyms & Misapplications:
(none provided)
Additional Resources:

PNW Herbaria: Specimen records of Hordeum murinum in the Consortium of Pacific Northwest Herbaria database.

WA Flora Checklist: Hordeum murinum checklist entry.

OregonFlora: Hordeum murinum information.

E-Flora BC: Hordeum murinum atlas page.

CalPhotos: Hordeum murinum photos.

USDA Plants: Hordeum murinum information.

27 photographs:
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