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Montana Field Guide

Montana Field Guides

Broad-glumed Brome - Bromus latiglumis

Undetermined Origin
Not Documented

Global Rank: G5
State Rank: SNA
(see State Rank Reason below)

Agency Status
MNPS Threat Rank:

External Links

State Rank Reason (see State Rank above)
Bromus latiglumis has not been documented in Montana (Lesica et al. 2012; Postings as of October 23, 2019 on the Consortium of Pacific Northwest Herbaria [] and Rocky Mountain Herbarium [] portals). A reported 2010 observation is likely a mis-identification and no specimen was collected. There is potential for it to occur in Montana, and potential specimens should be reported and confirmed by one of our State Herbaria (University of Montana, Montana State University, or Montana State University-Billings). A conservation status rank is not applicable (SNA) because this plant is not known to occur in Montana.
General Description
Cespitose perennials 55-130(-160) cm tall. Culms mostly glabrous, internodes usually 10 or more. Blades 10-30 cm long, 3.5-11(-13) mm wide, glabrous to scabrous or (rarely) sparsely appressed-pubescent; sheaths glabrous to densely retrorse-pilose; auricles present and conspicuous (unless broken off); ligules mostly less than 1.5 mm long, often pubescent. Panicle 10-24 cm long, open, the branches spreading to ascending, somewhat flexuous. Spikelets 5-10(-12)-flowered, 15-33 mm long, 4-9 mm wide. Glumes and lemmas usually hairy. First glume mostly 5-7 mm long, 1-nerved; second glume mostly 6.5-9 mm long, 3-nerved; lowest lemma 8.5-11 mm long, awned 1-5 mm; anthers 1.5-2.8 mm long.

Adapted from Sutherland in Flora of the Great Plains 1986.

Diagnostic Characteristics
In Montana Broad-glumed Brome can be distinguished by other native, perennial bunchgrasses by exhibiting culms with 9-20 nodes, leaf sheaths with dense pilose hairs near the collar and throat, and auricles of 1-2.5 mm long on most of the lower leaves (Lesica et al. 2012).

Range Comments
Northern Great Plains from AB and ND east to QB and ME, south KS, TN and NC (Kartesz in prep. 2012).

Shaded or open woods, along stream banks, and on alluvial plains and slopes (Barkworth in FNA 2007).

  • Literature Cited AboveLegend:   View Online Publication
    • Flora of North America Editorial Committee. 2007. Flora of North America North of Mexico. Vol. 24. Magnoliophyta: Commelinidae (in part): Poaceae, part 1. Oxford Univ. Press, New York. xxviii + 911 pp.
    • Great Plains Flora Association (McGregor, R.L., coordinator, and T.M. Barkley, R.E. Brooks, and E.K. Schofield - eds.). 1986. Flora of the Great Plains. Lawrence, KS: Univ. Press Kansas. 1392 pp.
    • 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:
Broad-glumed Brome — Bromus latiglumis.  Montana Field Guide.  .  Retrieved on , from