Deschampsia cespitosa, also known as tufted hair grass, and tussock grass, is from the shortgrass prairie.  They are cool season, clump forming, and long lived.  They are a good choice for covering a large, bare area, as they also self-seed, and fill in quickly.

Variety:

Deschampsia cespitosa 'Bronzeveil'   leaves are dark green, semi-evergreen, 2' tall     seed heads are translucent buff 2-3' tall, with loose panicles, giving it an airy look     zone 4     drought tolerant once established     used as groundcover, and for slope stabilization