Grasses

Grasses
Arabiangrass
Buffelgrass
Cheatgrass
Crimson fountaingrass
Field sandbur
Giant reed
Japanese brome
Johnsongrass
Jointed goatgrass
Lehmann lovegrass
Mediterranean grass
Quackgrass
Ravennagrass
Red brome
Rescuegrass
Ripgut brome
Southern sandbur
Tall fescue
Uruguayan pomps grass
Weeping lovegrass
Wild oat

 

Ripgut Brome
Bromus diandrus Roth (Grass family, Poaceae)
 

Description

Ripgut brome is a loosely cespitose or tufted annual cool-season bunchgrass. It produces dense, low, leafy growth in the fall. It does not have creeping stolons or rhizomes; however, it has an extensive fibrous root system and tillers profusely.

Plants: Culms 7-7/8 to 35-3/8 inches tall, erect or decumbent, puberulent below the panicle; leaf sheaths softly pilose, often with retrorse or spreading hairs; auricles absent; ligules less than 1/8 inch long, obtuse, lacerate or erose; blades 1-3/8 to 14-3/4 inches long, less than 3/8 inches wide, both surfaces pilose.
Inflorescence/Spikelet/Floret: Flowers April to June; inflorescence is a panicle, 5-1/8 to 14-3/4 inches long, 3/8 to 4-3/4 inches wide, erect to spreading; panicle branches 3/8 to 2-3/4 inches long, stiffly erect to ascending or spreading, with 1 or 2 spikelets; spikelets 1 to 2-3/4 inches long, sides parallel or diverging from the center, moderately laterally compressed, with 4 to 11 florets per spikelet; glumes smooth or scabrous, margins hyaline, lower 3/4 to 1-3/8 inches long, 1 to 3 nerves, upper 3/4 to 1-3/8 inches long, 3 to 5 nerves; lemmas 3/4 to 1-3/8 inches long, linear-lanceolate, scabrous, 7 nerved, rounded over the mid-nerve, margins hyaline, apices bifid, acuminate, teeth less than 3/16 inch long; awns 1-3/16 to 2-9/16 inches long, straight, arising less than 1/16 inch below the lemma apices.

Habitat

Cultivated and disturbed or degraded sites in desert and semidesert grassland communities, and roadsides within elevations that generally range from 3,200 to 4,600 feet.

Propagation/Phenology

Reproduces by seed.

Comments

Native to southern and western Europe; the common name “ripgut brome” suggests possible damage to animals if they consume the sharp, long-awned florets of this species. Ripgut brome may suppress the growth of native plants. Bromes are known to cause hay fever and asthma. Ripgut brome has poor forage quality. This species generally occurs as a weed in wildland areas of the Southwestern Region rather than as an invasive plant.

collage of 4 images

 
Forest Service Shield
Invasive plants and weeds of the national forests and grasslands in the southwestern region
Ariabiangrass inflorescence Arabiangrass spikelet Arabiangrass plants Ripgut brome spikelet Ripgut brome leaf collar region Ripgut brome spikelets Ripgut brome plants