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Plant
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Yavapai County Native & Naturalized Plants

Achnatherum speciosum - Barkworth desert needlegrass

Synonyms: Stipa speciosa, Pappostipa speciosa
Plant Form: Grass

Family: Poaceae


   
 
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Plant and blades
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Seedhead
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Spikelets
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  Grass Description -   Glossary of Grass Terminology


Origin: Native    Season: Cool
Habitat Description: Coarse rocky soils with little or no profile development such as alluvial fans, dry rocky hills and talus slopes.
Plant Communities:Desert Scrub, Interior Chaparral, Semidesert Grasslands, Pinyon Juniper Woodland
Elevation: 2000 - 6500 feet


General Description

Desc: A short perennial bunchgrass reaching a height of 1 to 2 feet. Leaf blades are thin and rolled along the edges. The inflorescence is up to 2 inches long and is dense and fluffy. Each spikelet is very hairy and has a bent awn coated in long hairs.
Identification Notes: A robust plant with firm glumes, hairy collars and 1 inch once bent awns that have a straight terminal segment. The seedhead is branched but narrow as branching is appressed.
Grass Type: Perennial bunchgrass  Rhizomes: N  Stolons: N
Large Dense Clump (> 2 feet): N  Bushy (highly branched): N
Height with Seedheads: 12 to 24 inches
Seedhead Structure: Branched - contracted  Seedhead Droops: N
Flowering Period: Mar - Jun
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: Y
Flower and Seedhead Notes: Each spikelet is very hairy and has a bent awn which is coated in long hairs. The inflorescence is compact, 4 to 6 inches long and generally partly enclosed by the uppermost leaf sheath.
Vegetative Charcteristics

Blade Hairy: Y    Blade with White Margins: N    Blade Cross section: Involute
Blade Notes: Leaves mostly basal and below the middle of stems with leaves sheathing at bases. Leaf blades very narrow with rolled margins and more or less hairy.
Sheath Hairy: Y    Tuft of Hairs at top of Sheath or Collar: Y    Ligules: Membranous and hairy
Auricles (Ear-like lobes at collar area: N

Forage Value: Desert needlegrass is palatable to all classes of livestock and wildlife such as desert bighorn sheep and feral burros when young. After it matures it is moderately grazed by horses and cattle, but is often avoided by other livestock such as sheep.


  Arizona Cooperative Extension
Yavapai County
840 Rodeo Dr #C
Prescott, AZ 86305
(928) 445-6590
Version 8.0  
http://cales.arizona.edu/yavapaiplants/SpeciesDetailGrass.php  
Last Updated: Dec 13, 2022
Content Questions/Comments: Email Matt Halldorson  
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