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Yavapai County Native & Naturalized Plants

Setaria grisebachii - Grisebach's bristlegrass

Plant Form:Grass

Family: Poaceae

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Patrick Alexander @
  Grass Description -   Glossary of Grass Terminology

Origin: Native    Season: Warm
Habitat Description: Found on rocky slopes, washes, and in open woodlands.
Plant Communities: Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland
Elevation: 2000 - 6500 feet

General Description

Desc: Distinguished by being an annual with densely hairy sheaths; loose, interrupted seedheads which taper toward the apex; 1 to 2 bristles below each spikelet; finely wrinkled lemmas.
Identification notes: Annual, 6 to 20 inches tall; seedheads loosely spike-like, interrupted, often purple, tapering at apex; bristles subtend spikelets; stems often bent, spreading, branching at the base; sheaths densely hairy; internodes smooth nodes microscopically hairy.
Grass Type: Annual  Rhizomes: Y  Stolons: Y
Large Dense Clump (> 2 feet): N  Bushy (highly branched): N
Height with Seedheads: 12 to 24 inches
Seedhead Structure: Branched - open and spreading  Seedhead Droops: N
Flowering Period: Aug - Dec

Flower Characteristics

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

Flower and Seedhead Notes: Panicles 1 to 6 inches long,loosely flowered and tapering to a point; spikelets 1/16 inch long; lower glumes about one third as long as the spikelets, distinctly 3-veined.

Vegetative Characteristics

Blade Hairy: Y  Blade with White Margin: N  Blade Cross Section: Flat  
Blade Notes: Blades lance-shaped, widest below mid-point of the blade, tapering to a point, 1/16 to 1/2 inch wide; leaf blades mostly flat, more or less hairy, scabrous, roughened or wrinkled.
Sheath Hairy: Y  Tuft of Hairs Top of Sheath or Collar: N  Ligules: Hairy
Auricles (Ear-like lobes at base of blades): N
Vegetative Notes: Sheaths with fringe of hair on margins; ligules also hairy.

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  
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