bunch grass(n = noun.plant) bunchgrass - 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;
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]