Arizona Range Grasses
Their Description, Forage Value, and Grazing Management
Cooperative Extension,College of Agriculture & Life Sciences, The University of Arizona

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RING MUHLY (RINGGRASS)
Muhlenbergia torreyi (Kunth.) Hitchc. ex Bush.

 


Figure 50.—Ringgrass (Muhlenbergia torreyi).

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Description

Growth habit: A low-growing, fine-leaved, fine-stemmed sodgrass that tends to grow in rings. These are caused by the center dying out as the plant enlarges. The rings may range in size from several inches to a few feet across.
Color: Green to bluish-green, reddish or purplish. The red or purple cast is given the plants by the numerous seed heads.
Leaves: Very numerous, forming a crisp, curly cushion, slender to the point of being threadlike, curved rather like a bow and inrolled at the edges; from 1/2 to 1 1/2 inches long.
Inflorescence: Usually from 2 to 9 inches long, profusely spreading with fine, almost hair-like branches. The flowerheads are usually purplish even before maturity. Seeds are small and the lemma of the spikelet is tipped with a fine awn that may be twice as long as the seed.
Season: Warm Season
Origin: Native

Occurrence

Widespread throughout much of the pinyon-juniper and grassland range in the central and northern part of the state. An abundance of this grass is almost always a sign of a range that has been overgrazed. Occasionally it may indicate poor site potential.

 

Forage Value

Even when ring muhly is young and growing rapidly its palatability is low. As the plants mature palatability drops almost to zero. Because of their low palatability and small size, ring muhly plants have very little value as forage.


Grazing Management

Ranges with ring muhly should be managed with other grasses as key species. Continued attempts to obtain even a moderate amount of grazing from the ringgrass will in time drive out all of the desirable forage species. Ranges with an abundance of this grass should be rested during the summer rainy season at least every other year until the vigor and density of the better forage species has clearly improved.


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Document located http://cals.arizona.edu/pubs/natresources/az1272/
published
2002
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