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Max Licher @
Yavapai County Native & Naturalized Plants

Setaria pumila - yellow foxtail

Plant Form:Grass

Family: Poaceae

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  Grass Description -   Glossary of Grass Terminology

Origin: Introduced    Season: Need value
Habitat Description: Found in lawns, irrigated lands, waste places, in disturbed soils.
Plant Communities: Disturbed Areas
Elevation: 4500 - 7000 feet

General Description

Desc: Mostly hairless stems ranging from green to purple-tinged bristles. The bristles turn yellow at maturity, giving the grass its name.
Identification notes: Tufted 1 to 3 foot annual; stems branch at base, usually at sharp angles, blade with hairs on lower surface; dense, spikelike, erect seedheads; spikelets turgid, subtended by 1/8 to 1/4 inch long 5-20 bristles, ligule a dense fringe of stiff hairs.
Grass Type: Annual  Rhizomes: N  Stolons: N
Large Dense Clump (> 2 feet): N  Bushy (highly branched): N
Height with Seedheads: 24 to 36 inches
Seedhead Structure: Branched - contracted  Seedhead Droops: N
Flowering Period: Jul - Oct

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: The seedhead is cylindrical and bristly, reaching 6 inches in length and 1/3 to 2/3 inch in width. Spikelets are approximately 1/8 inch long, green, and each spikelet has 1 to 3 bristles that are 1/4 to 1/2 inch long.

Vegetative Characteristics

Blade Hairy: Y  Blade with White Margin: N  Blade Cross Section: Flat  
Blade Notes: Leaf blades may reach 12 inches in length and 7 to 12-1/2 inches in width, and have long silky hairs at the leaf bases. Auricles are absent and the ligule is a fringe of hairs reaching 1/16 inch in length.
Sheath Hairy: N  Tuft of Hairs Top of Sheath or Collar: N  Ligules: Hairy
Auricles (Ear-like lobes at base of blades): N
Vegetative Notes: Sheaths smooth; ligules 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  
Content Questions/Comments: Email Jeff Schalau  
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