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Montana Field Guide

Montana Field Guides

Smooth Brome - Bromus inermis ssp. inermis

Non-native Species

Global Rank: G5T5
State Rank: SNA

Agency Status


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General Description
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Diagnostic Characteristics
This subspecies, which is considered non-native, is contrasted from subsp. pumpellianus (which is recognized as a species in Flora North America) by its (usually) glabrous lemmas (which can be sparsely short-hairy at the base and along the margins), usually glabrous nodes and leaf blades, and the absence of awns or awns no more than 3 mm long (Pavlick and Anderton, 2007, Fl. North America, Vol. 24).

Range Comments
Widespread and non-native, across most of North America excluding southeastern states where it is absent (FL) or rare (others) (Kartesz 2009).

Observations in Montana Natural Heritage Program Database
Number of Observations: 9

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Relative Density



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


  • Additional ReferencesLegend:   View Online Publication
    Do you know of a citation we're missing?
    • Aho, Ken Andrew. 2006. Alpine and Cliff Ecosystems in the North-Central Rocky Mountains. Ph.D. Dissertation. Bozeman, Montana: Montana State University. 343 p.
    • Culver, D.R. 1994. Floristic analysis of the Centennial Region, Montana. M.Sc. Thesis. Montana State University, Bozeman. 199 pp.
    • Eggers, M.J.S. 2005. Riparian vegetation of the Montana Yellowstone and cattle grazing impacts thereon. M.Sc. Thesis. Montana State University, Bozeman, MT. 125 p.
    • Lesica, P., M.T. Lavin, and P.F. Stickney. 2012. Manual of Montana Vascular Plants. Fort Worth, TX: BRIT Press. viii + 771 p.
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Citation for data on this website:
Smooth Brome — Bromus inermis ssp. inermis.  Montana Field Guide.  .  Retrieved on , from