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Montana Field Guide

Montana Field Guides

Field Brome - Bromus arvensis

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
Erect annuals 80-110 cm tall. Lower sheaths with dense, soft, apprsssed hairs; ligules 1-1.5 mm long, hairy, obtuse, erose; blades 10-20 cm long, 2-6 mm wide, coarsely pilose on both surfaces. Panicles 11-30 cm long, 4-20 cm wide, open, erect or nodding; branches usually longer than the spikelets, ascending to widely spreading. Spikelets 10-25 mm long, terete to moderately compressed, often purple-tinged; florets 4-10. Glumes glabrous; lower glumes 4-6 mm long, 3-veined; upper glumes 5-8 mm long, 5-veined; lemmas 7-9 mm long, obscurely 7-veined, rounded over the midvein, glabrous, apices acute, bifid, teeth less than 1 mm long; awns 6-11 mm, straight; anthers 2.5-5 mm long; caryopses shorter than the paleas, weakly to strongly inrolled (adapted from: Pavlick and Anderton, 2007, in Flora N. America, Vol. 24).


While many authors (Holmgren and Holmgren, 1977 in Intermountain Flora Vol. 6; Lavin and Seibert 2011 in Grasses of Montana; Shaw 2008 in Grasses of Colorado) include B. arvensis in synonymy of other species, Pavlick and Anderton (2007, Flora North America, Vol. 24) recognize it as distinct.

Range Comments
Infrequent and scattered from WA, ID, MT, ND, AZ, OK, and TX east of the Mississippi River (Pavlick & Anderton, 2007, in Flora of N. America, Vol. 24). Distrubtion maps should be interpreted with caution from other sources, given the frequency that this species is included in the synonymy of other species.

Habitat
Roadsides, fields, and waste areas; native to southern and south-central Europe (Pavlick & Anderton, 2007, in Flora of N. America, Vol. 24).

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