Skip to main content

Setaria viridis - green bristlegrass

Scientific Family
Poaceae
Plant type
Grasses
Riparian
No

Grass Description

Origin
Introduced
Season
Cool
Warm

Found in lawns, along roads, waste places, farmed lands, and disturbed ground.

Plant Community
Disturbed Areas
Low elevation
2000
High elevation
8000

General Description

Introduced, tufted grass with rolled leaf arrangement, stems bent at the base and ascending above, branching, smooth.

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
No
Stolons
No
Clump Diameter 2 ft or more
Yes
Bushy - highly branched
No
Height with Seedheads
24 inches or more
Seedhead Structure
Branched - contracted
Seedhead droops
No
First bloom month
June
Last bloom month
August

Flower Characteristics

Flowers per Spikelet
One-flowered
Spikelets One-Sided
No
Awns
Absent
Three Awns
No
Awns bent
No
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 is hairy
No
Blade margins white
No
Blade cross-section
Flat

Blades to 10 inches long, about 1/16 inch wide, lance-shaped, flat, smooth or rough, parallel-veined.

Sheath is hairy
Yes
Tufts of hair top of sheath or collar
Yes
Ligule
Membranous and hairy
Auricles
No

Not available.