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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VINE MESQUITE
Panicum obtusum H.B.K


Description

Growth habit: A perennial viney type of sodgrass. Runners form on top of the ground. These are round, wiry and may be as much as 10 feet long. The nodes of these runners are swollen and densely hairy. Because of the sod growth habit, stands of the grass are often rather dense.
Color: Light bluish-green, curing first to a reddish-straw color and finally to a gray tan.
Leaves: Flat to somewhat inrolled at the edges; hairless or very nearly so; up to 8 inches long; about 1/4 inch wide.
Inflorescence: Generally 3 to 5 inches long. Each inflorescence consists of two to six 1-inch long branches, closely appressed to the main stem. The large, blunt seeds are borne along these branches.
Season: Warm Season
Origin: Native


Figure 54.—Vine mesquite (Panicum obtusum), plant and spikelet .

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Occurrence

In all counties except Coconino, Graham, Pinal, and Maricopa at elevations ranging from 1,000 to 6,000 feet. This grass usually grows in swales, mud flats, lowlands with fine-textured soils, and along drainages that are irrigated at times by flood waters. It extends up into the lower ponderosa pine forest but is more common at slightly lower elevations.

Forage Value

Vine mesquite provides fair forage for all grazing animals while green, but becomes coarse and unpalatable after maturity. It rates excellent as an erosion control plant.


Grazing Management

Vine mesquite should be grazed during the summer while actively growing because the stems and leaves are coarse and lose much of their palatability on drying. When this grass grows in areas that are subject to erosion, it should not be heavily grazed. Light grazing gives the runners an opportunity to grow and permits the plants to spread.


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