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Montana Field Guide

Montana Field Guides

Hairy Brome - Bromus commutatus

Exotic Species (not native to Montana)

Global Rank: GNR
State Rank: SNA

Agency Status
USFWS:
USFS:
BLM:
MNPS Threat Rank:
C-value: 1

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General Description
Annuals, culms 40-120 cm, erect or ascending. Lower sheaths densely stiff-hairy (hairs often retrorse); upper sheaths pubescent or glabrous; ligules 1-2.5 mm, glabrous or pilose, obtuse, ciliolate; blades 9-18 cm long, 2-4 mm wide, pilose on both surfaces. Panicles 7-16 cm long, 3-6 cm wide, open, erect to ascending; branches sometimes longer than the spikelets, slender, erect to spreading. Spikelets 14-18(-30) mm, terete to moderately compressed; florets 4-9(11). Lower glumes 5-7 mm, 5-veined; upper glumes 6-9 mm, 7(9)-veined; lemmas 8-11.5 mm long, backs usually glabrous, distinctly 7(9)-veined, margins scabrous or pubescent, awns 3-10 mm, straight, arising less than 1.5 mm below the leema apex; anthers 0.7-1.7 mm. Caryopsis equal to or shorter than the paleas (adapted from: Pavlick & Anderton, 2007, in Flora N. America, Vol. 24).

Species Range
Unknown/Undetermined
 


Range Comments
Native to Europe and the Baltic region; now widespread across North America (Pavlick & Anderton, 2007, in Flora N. America, Vol. 24).

Summary of Observations Submitted for Montana
Number of Observations: 5

(Click on the following maps and charts to see full sized version) Map Help and Descriptions
Relative Density

Recency

 

(Observations spanning multiple months or years are excluded from time charts)



References
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Citation for data on this website:
Hairy Brome — Bromus commutatus.  Montana Field Guide.  .  Retrieved on , from