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Grass Family (Poaceae). This plumegrass is a native, warm season, robust, perennial bunch grass. The average height is 4 to 7 feet. The leaf blade is wide and flat with strong midrib. The leaf sheath has few hairs, especially at upper end, and is shorter than internodes. The stem is large and rigid and 3/8 to 1/2 inches in diameter at base. The nodes are smooth or covered with short white hairs. Seedheads are open panicles, brownish at maturity with hairs as long as spikelets at its base. The glume has an awn 3/8 to 1/2 inched long spirally coiled at the base of the spikelet.