Muhlenbergia porteri Scribn. A large, weak stemmed, fine, wiry perennial bunchgrass.
Stems are leafy for their entire length, branched, bent at the joints, and knotty at the base.
Some stems remain a dull green throughout the year. Fine, many-branched, loosely drooping, purplish. During good years the very numerous inflroescence give the entire plant a cobwebby appearance. Occurrence Dry mesas and rocky slopes from 2,000 to 6,000 feet in all counties of the state except Apache county. This was formerly one of the most abundant and important grasses of southern Arizona, but is now often found largely as individual plants under the protection of shrubs.