Calamovilfa longifolia is a species of grass known by the common names prairie sandreed and sand reedgrass.

It is native to North America, where it occurs from the Northwest Territories to Ontario in Canada and as far south as New Mexico and Kansas in the United States.

[1][2] This species is a perennial grass with long, leafy rhizomes which hold the soil, forming sod.

It is a dominant grass species in many regions, including the Nebraska Sand Hills[5] and other sand hills, the Red River Valley, many prairies and grasslands of the Great Plains, and certain beaches along the Great Lakes, such as those at Kohler-Andrae State Park and Point Beach State Forest in Wisconsin.

[1] Though it is not one of the most palatable or nutritious grasses, this species is an important forage for livestock in sand hills regions.