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Herbarium specimen
Yavapai County Native & Naturalized Plants

Setaria viridis - green bristlegrass

Plant Form:Grass

Family: Poaceae

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  Grass Description -   Glossary of Grass Terminology

Origin: Introduced    Season: Cool and Warm
Habitat Description: Found in lawns, along roads, waste places, farmed lands, and disturbed ground.
Plant Communities: Disturbed Areas
Elevation: 2000 - 8000 feet

General Description

Desc: Introduced, tufted grass with rolled leaf arrangement, stems bent at the base and ascending above, branching, smooth.
Identification notes: Annual tufted grass 1 to 3 feet, erect stems that branch at the base; spikelike, erect seedhead,rounded at the apex; spikelets less than 1/8 inch long; 3 to 5 bristles subtend spikelets; lower glume hairy on back.
Grass Type: Perennial mat or sod-forming  Rhizomes: N  Stolons: N
Large Dense Clump (> 2 feet): Y  Bushy (highly branched): N
Height with Seedheads: 24 to 36 inches
Seedhead Structure: Branched - contracted  Seedhead Droops: N
Flowering Period: Jun - Aug

Flower Characteristics

Number of Flowers per Spikelet: One-flowered  Spikelets One-sided: N
Awns: Absent   Three Awns: N  Awns Bent: N

Flower and Seedhead Notes: Seedhead a terminal arrangement of spikelets, dense, 1 to 8 inches long, spikelike, numerous bristles about 1/3 inch long. Bristles green or purplish, rough. Spikelets nearly stalkless to short-stalked, about 1/16 inch long, lance-shaped to ellipsoid.

Vegetative Characteristics

Blade Hairy: N  Blade with White Margin: N  Blade Cross Section: Flat  
Blade Notes: Blades to 10 inches long, about 1/16 inch wide, lance-shaped, flat, smooth or rough, parallel-veined.
Sheath Hairy: Y  Tuft of Hairs Top of Sheath or Collar: Y  Ligules: Membranous and hairy
Auricles (Ear-like lobes at base of blades): N
Vegetative Notes: Sheaths sometimes minutely rough, fringed with hairs near the top. Ligules 1/16 inch long, membranous, marginally fringed with hairs.

Forage Value: Not available.

  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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