field brome

Bromus arvensis L.

Description from Invasive.org

Appearance

Bromus arvensis is an annual in the grass family (Poaceae). It is a cool season, annual grass that can range in height from 14-40 in.

Foliage

Leaf blades are flat, covered with soft, distinct, thin hair, approximately 1-8 in. in length, and 1/32-1/16 of an in. wide. Sheaths are covered with dense, soft hairs. Ligules are 1/64-1/16 of an in. long and auricles are absent.

Flowers

Inflorescence is an open panicle, 2-7 in. long with spreading, usually drooping branches. Spikelets are 6 to 10 flowered, 1/2-1 in. in length, and 1/8-1/4 of an inch wide. First glumes are usually 3- to 5- nerved, 1/8-1/4 of an inch long. Second glumes are 5- to 9-nerved and 1/4-1/2 of an inch in length.

Fruit

Lemmas are broader at the upper-half, tapering to the bottom, with margins not strongly enrolled in the fruit. Awns are 1/4-3/4 in. long, somewhat twisted and widely spread at maturity.

Ecological Threat

Bromus arvensis can be found on a wide variety of soils that include sand, silt, and clay, but thrives on fine-textured soils. Waste areas, disturbed sites, roadsides, pastures, rangelands, and wheat fields are areas where Bromus arvensis can establish. The plant is a common component of many mixed prairie communities. It is an aggressive species that out-competes desirable vegetation for water and soil nutrients, thus reducing plant biodiversity. Forage production of perennial grasses and grazing performance is also reduced in areas infested with Bromus arvensis.

Selected Images from Invasive.org

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Flower(s) Dried flowers
John M. Randall, The Nature Conservancy, Bugwood.org
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Flower(s) inflorescence.
Joseph M. DiTomaso, University of California - Davis, Bugwood.org
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Flower(s) spikelets.
Joseph M. DiTomaso, University of California - Davis, Bugwood.org
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Stem(s) collar and sheath.
Joseph M. DiTomaso, University of California - Davis, Bugwood.org
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