(n)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.bunch grass
The Collaborative International Dictionary of English (GCIDE) v.0.53Collaborative International Dictionary (GCIDE)
(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 ]