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Intermountain Herbarium
Intermountain Herbarium (Utah State University)
Yavapai County Native & Naturalized Plants

Muhlenbergia depauperata - sixweeks muhly

Plant Form:Grass

Family: Poaceae

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  Grass Description -   Glossary of Grass Terminology

Origin: Native    Season: Warm
Habitat Description: Grows on gravelly flats, rocky outcrops, exposed bedrock, limestone soils and sandy banks in grassland and scrub associations. Can form dense stands in depressions and flats in limestone gravel.
Plant Communities: Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland
Elevation: 5000 - 8000 feet

Similar Species: M. brevis

General Description

Desc: Small tufted annuals with erect or trailing branches from the base. Seedhead branches are appressed.
Identification notes: Annual; seedhead with appressed branches; first glume bifid; lemmas awned. Similar toM. brevis. but with shorter lemma awns (6 to 15 mm) as compared to 10 to 20 mm.
Grass Type: Annual  Rhizomes: N  Stolons: N
Large Dense Clump (> 2 feet): N  Bushy (highly branched): N
Height with Seedheads: Less than 12 inches
Seedhead Structure: Branched - contracted  Seedhead Droops: N
Flowering Period: Aug - Oct

Flower Characteristics

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

Flower and Seedhead Notes: Seedhead branches are 1 to 3 inches long and compressed with pairs of appressed spikelets.

Vegetative Characteristics

Blade Hairy: Y  Blade with White Margin: Y  Blade Cross Section: Flat or involute  
Blade Notes: Blades have a rough surface and are 1 to 3 inches long, 1/8 inch wide, flat or inrolled; midveins and margins thickened and whitish in color.
Sheath Hairy: Y  Tuft of Hairs Top of Sheath or Collar: N  Ligules: Membranous
Auricles (Ear-like lobes at base of blades): N
Vegetative Notes: Sheaths are rigid, somewhat inflated and wrap around bases of seedhead branches, smooth or hairy with transparent or papery margins and may be spirally coiled when old. Ligules are 1/8 inch long, membranous, pointed and having lateral lobes.

Forage Value: Fair to good.

  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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