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Achnatherum speciosum - Barkworth desert needlegrass

Scientific Family
Poaceae
Synonyms
Stipa speciosa, Pappostipa speciosa
Plant type
Grasses
Riparian
No

Grass Description

Origin
Native
Season
Cool

Coarse rocky soils with little or no profile development such as alluvial fans, dry rocky hills and talus slopes.

Plant Community
Desert Scrub
Grasslands
Interior Chaparral
Pinyon Juniper Woodlands
Low elevation
2000
High elevation
6500

General Description

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.

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

Flower Characteristics

Flowers per Spikelet
One-flowered
Spikelets One-Sided
No
Awns
1/4 inch to 1 inch
Three Awns
No
Awns bent
Yes
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 Characteristics

Blade is hairy
Yes
Blade margins white
No
Blade cross-section
Involute – rolled inward on upper surface

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

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.