1) Bunch grass 2) Grass 
A grass that grows in clumps of tussock with a clear boundary around the plant. It has no prominent stolons or rhizomes.
[n] - any of various grasses of many genera that grow in tufts or clumps rather than forming a sod or mat
bunch grass noun any of various grasses of many genera that grow in tufts or clumps rather than forming a sod or mat; chiefly of western United States