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Bouteloua hirsuta - hairy grama

Scientific Family
Poaceae
Synonyms
Bouteloua hirta var. minor, Bouteloua palmeri, Chondrosum aschenbornianum, Chondrosum drummondii, Chondrosum hirtum
Other common names
navajita velluda
Plant type
Grasses
Riparian
No

Grass Description

Origin
Native
Season
Warm

Found on rocky slopes, open plains, and shaded openings in woods, often on rocky soils.

Plant Community
Grasslands
Interior Chaparral
Pinyon Juniper Woodlands
Low elevation
4000
High elevation
6500
Similar species
Bouteloua gracilis

General Description

Tufted bunchgrass, numerous 10 to 24 inch tall erect, leafy based seedheads with up to 4 comb-like branches, branch tips exceeding the spikelets.

Tufted erect perennial, sometimes stoloniferous. Stems and sheath hairy. Ligule a fringe of hairs. Leaves basal, mostly flat, margins hairy at bases. Seedheads of up to 4 branches of one-sided spikelets, branch tips extend beyond the spikelets.

Grass type
Perennial bunchgrass
Rhizomes
No
Stolons
Yes
Clump Diameter 2 ft or more
No
Bushy - highly branched
No
Height with Seedheads
12 inches or more
Seedhead Structure
Branched - comblike
Seedhead droops
No
First bloom month
August
Last bloom month
October

Flower Characteristics

Flowers per Spikelet
Multi-flowered
Spikelets One-Sided
Yes
Awns
Less than 1/4 inch
Three Awns
Yes
Awns bent
No
Flower and Seedhead Notes

Seedhead typically has 2, sometimes 3 or 4 hairy comb-like branches with up to 50 one-sided spikelets. The spikelet branches extend beyond the spikelets as a naked point. Spikelets are green to dark purple; glumes are awn-tipped.

Vegetative Characteristics

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

Leaves are mostly basal, <1/8 inch wide, 1 to 5 inches long, and flat to inrolled with hairs often present on both surfaces, usually also present on the bases of the margins.

Sheath is hairy
No
Tufts of hair top of sheath or collar
Yes
Ligule
Hairy
Auricles
No

Very good, one of the most important Arizona range grasses.