bunch grass

from WordNet (r) 3.0 (2006)

bunch grass
    n 1: 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 [syn: {bunchgrass}, {bunch grass}]

from The Collaborative International Dictionary of English v.0.48

Bunch grass \Bunch" grass`\ (Bot.)
   A grass growing in bunches and affording pasture. In
   California, {Atropis tenuifolia}, {Festuca scabrella}, and
   several kinds of {Stipa} are favorite bunch grasses. In Utah,
   {Eriocoma cuspidata} is a good bunch grass.
   [1913 Webster]