Muhlenbergia asperifolia is a species of grass known as alkali muhly and scratchgrass.

It is native to much of North America, including most of southern Canada, most of the continental United States except for the southeastern region, and parts of northern Mexico.

Muhlenbergia asperifolia is a rhizomatous perennial grass growing decumbent or spreading or erect up to about 60 cm (2 ft) tall.

The inflorescence is a very open, wispy array of many hair-thin, outstretched branches each up to 14 cm (5.5 in) long.

Muhlenbergia asperifolia is a valuable grass for habitat restoration and revegetation projects in disturbed habitat in the southwest United States, especially in riparian zones in California and the Intermountain West.