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Yavapai County Native & Naturalized Plants

Bromus arizonicus - Arizona brome

Plant Form:Grass

Family: Poaceae

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Max Licher @
  Grass Description -   Glossary of Grass Terminology

Origin: Native    Season: Cool and Warm
Habitat Description: Grows in dry, open areas and disturbed ground below 6500.
Plant Communities: Desert Scrub, Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland, Montane Conifer Forest, Disturbed Areas
Elevation: 1000 - 6500 feet

Similar Species: B. carinatus, B. marginatus

General Description

Desc: Annual grass growing over 3 feet tall with open, branching seedheads. The spikelets are flat and hairy and have awns up to 1/2 inch long.
Identification notes: Spikelets are definitely flattened; the second glume is nearly equal to the lowest floret; lemmas are keeled, hairy on their margins and have awns of 1/4 to 1/2 inch long.
Grass Type: Annual  Rhizomes: N  Stolons: N
Large Dense Clump (> 2 feet): U  Bushy (highly branched): N
Height with Seedheads: 24 to 36 inches
Seedhead Structure: Branched - contracted  Seedhead Droops: N
Flowering Period: Mar - Oct

Flower Characteristics

Number of Flowers per Spikelet: Multi-flowered  Spikelets One-sided: N
Awns: 1/4 inch to 1 inch   Three Awns: N  Awns Bent: N

Flower and Seedhead Notes: Spikelets 3/4 to 1 inch, elliptic to lanceolate, strongly laterally compressed, with 4–8 florets. Seedheads are 1 to 3 feet tall, 1/8 inch thick, often lying along the ground with the extremity curving upward. Flowers mostly March to June.

Vegetative Characteristics

Blade Hairy: N  Blade with White Margin: Y  Blade Cross Section: Flat  
Blade Notes: Blades 3 to 6 inches long, 1/8 to 1/2 inch wide, flat, sparsely with soft hairs on both surfaces, sometimes the lower side is smooth.
Sheath Hairy: Y  Tuft of Hairs Top of Sheath or Collar: U  Ligules: Hairy
Auricles (Ear-like lobes at base of blades): N
Vegetative Notes: Sheaths are pointed backwards with long soft hairs, sometimes smooth, throats sometimes with hairs; auricles are absent.

Forage Value: No information found.

  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 8.0  
Last Updated: Feb 16, 2020  
Content Questions/Comments: Email Jeff Schalau  
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