Buffalograss (Buchloe dactyloides) is described in the texts as a gray-green, fine-textured, warm-season grass. Translation: you're never going to get a dark green lawn out of this grass (so quit trying!) and it won't green up or start growing until the frosts end here in Kansas, usually around May 1st. It is, of course, a major component of the short-grass prairie to my west and it thrives both south and north of the Flint Hills. It is hardy from zones 3-9, and can be found growing naturally from Canada to Texas.
A big advantage of a buffalobrass lawn, in my estimation, is that you can forever give up overseeding or patch-seeding. Buffalograss spreads from rhizomes as you can see from the picture at the edge of my blacktop at the right, and it will fill in bare spots within a season if minimally cared for. I've had large areas develop sparse grass in my buffalograss lawn, especially when I was learning to care for it, but they are easy to entice the grass to fill in with a minimum of treatment and fertilizer.