Little bluestem, Schizachyrium scoparium, is a native perennial bunchgrass that is found commonly in prairies. It is commonly found throughout the U.S. and Mexico. It grows up to 24 inches in height and each clump up to a foot in diameter. It has slender blue-green stems that turn reddish in the fall and cotton-tufted seeds that disperse in the winter. Bluestem provides food for birds and small mammals.
My iNaturalist post can be found here.
Source: http://www.wildflower.org/plants/result.php?id_plant=SCSC