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Sporobolus flexuosus - mesa dropseed

Scientific Family
Poaceae
Plant type
Grasses
Riparian
No

Grass Description

Origin
Native
Season
Warm

Dry sandy and gravelly slopes, flats, and roadsides. Associated with desert scrub, pinyon-juniper and pine forests.

Plant Community
Desert Scrub
Disturbed Areas
Interior Chaparral
Montane Conifer Forest
Pinyon Juniper Woodlands
Grasslands
Low elevation
2000
High elevation
7000
Similar species
Sporobolus cryptandrus, S. contractus

General Description

Perennial bunchgrass, 1 to 3 feet tall, usually grows in rather small clumps. Stems are erect or trailing. It is a perennial grass but it is short-lived and is sometimes an annual.

Perennial; seedhead branches loosely flowered, branchlets and spikelet stems spreading; sheaths hairy on margins and collar; spikelets less than 1/8 inch long. Seedheads are always wide open and more loosely flowered then S. cryptandrus .

Grass type
Perennial bunchgrass
Rhizomes
No
Stolons
No
Clump Diameter 2 ft or more
No
Bushy - highly branched
No
Height with Seedheads
24 inches or more
Seedhead Structure
Branched - open and spreading
Seedhead droops
Yes
First bloom month
June
Last bloom month
October

Flower Characteristics

Flowers per Spikelet
One-flowered
Spikelets One-Sided
No
Awns
Absent
Three Awns
No
Awns bent
No
Flower and Seedhead Notes

Large loosely-flowered, airy, elongate seedheads have slender branches and branchlets which spread and droop. Grayish single-seeded spikelets have unequal glumes and no awns.

Vegetative Characteristics

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

Leaf blades are flat or folded, becoming V-shaped toward the long-tapered tips and are less than 1/8 inch wide and up to 8 inches long. The leaf sheaths are densely hairy at the top and often have a fringe of hair along the margins.

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

Browsed by wildlife and cattle during summer months with fair forage value. Mesa dropseed becomes unpalatable and low in nutrition at maturity.