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Bromus orcuttianus Vasey  
Family: Poaceae
Chinook Brome, more...Hall's Brome, Orcutt's brome, Hall's brome, Orcutt brome, Orcutt
[Bromopsis orcuttiana (Vasey) Holub, moreBromus brachyphyllus , Bromus hallii , Bromus orcuttianus var. hallii A.S. Hitchc.]
Bromus orcuttianus image
  • FNA
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Leon E. Pavlick and Laurel K. Anderton. Flora of North America

Plants perennial; not rhizomatous. Culms 90-150 cm, erect; nodes 2-4, pubescent or puberulent; internodes glabrous to pubescent, pilose to densely pubescent below the nodes. Basal sheaths sparingly to densely pilose, hairs 2-4 mm, occasionally glabrous; upper sheaths hairy, hairs to 1 mm, collars pilose, with hairs to 4 mm, or glabrous; auricles absent; ligules 1-3 mm, usually glabrous, occasionally pilose, obtuse, erose; blades 7-24 cm long, 3-12 mm wide, flat, usually glabrous, sometimes hairy. Panicles 7-13.5 cm, open; branches erect, ascending and appressed to slightly spreading. Spikelets 20-40 mm, elliptic to lanceolate, terete to moderately laterally compressed, with 3-9(11) florets. Glumes usually glabrous, occasionally scabrous or pubescent; lower glumes 5-9 mm, 1(3)-veined; upper glumes 7-11 mm, 3(5)-veined, sometimes mucronate; lemmas 9-16 mm, elliptic, rounded over the midvein, backs usually pubescent, sometimes glabrous or scabrous, margins pubescent or scabrous, apices obtuse, entire; awns (4)5.5-8 mm, straight, arising less than 1.5 mm below the lemma apices; anthers 3-5 mm. 2n = 14.

Bromus orcuttianus grows on dry hillsides and rocky slopes, and in open pine woods and meadows in the mountains, from 500-3500 m. It is found in the western United States, including Washington, Oregon, California, Nevada, and Arizona.

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The National Science Foundation
Development supported by National Science Foundation Grants (DBI 9983132, BRC 0237418, DBI 0743827, DBI 0847966)
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