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Sporobolus wrightii - big sacaton

Scientific Family
Poaceae
Synonyms
Sporobolus airoides var. wrightii
Other common names
big sacaton
sacaton
giant sacaton
(Spanish: zacatón)
Plant type
Grasses
Riparian
Yes

Grass Description

Origin
Native
Season
Cool
Warm

Heavier soils in lowland or wetland sites or seasonally flooded areas. Tolerant of highly alkaline and saline soil and poorly drained soils. Restricted to floodplains due to its need to access groundwater for survival.

Plant Community
Riparian
Low elevation
0
High elevation
6500

General Description

A coarse, upright bunch grass that forms dense clumps and can grow from 3 to 8 feet tall. The pale flowers form in stiff, upright clusters.

Tall, densely clumping perennial. Blades flat or involute, rough margins. Sheath sparsely hairy behind the ligule. Seedhead narrow, branches appressed, spikelet bearing to the base. Spikelets one flowered, unequal glumes.

Grass type
Perennial bunchgrass
Rhizomes
No
Stolons
No
Clump Diameter 2 ft or more
Yes
Bushy - highly branched
No
Height with Seedheads
Greater than 36 inches
Seedhead Structure
Branched - open and spreading
Seedhead droops
No
First bloom month
March
Last bloom month
November

Flower Characteristics

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

Primary seedhead branches spreading, secondary appressed; 8 to 24 inches long; 5 to 10 inches wide; seedhead stems exserted from base of plant; spikelets are 1/2 to 1 inch long, crowded, purplish or greenish. Fruits elliptical, reddish-brown or blackish.

Vegetative Characteristics

Blade is hairy
No
Blade margins white
No
Blade cross-section
Flat

Blade margins are roughened with stout projections. Blades are up to 1 foot long and 1 to 2-1/2 inches wide. The bottom of blades are rough, top surfaces are smooth.

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

A valuable forage species for livestock in arid and semi-arid regions.