疏丛性禾草
束生草
簇生草

[ 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
<noun.plant>

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.