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Grass Family (Poaceae). Giant cutgrass is a warm season, rhizomatous perennial grass. The height is between 3 to 9 feet. The leaf blade is long and flat, rough on edges, almost sawlike. The leaf sheath is rounded and opens with shorter than internodes. The seedhead is narrow and nodding panicles, spikelets unisexual, 1 flowered, male and female on same branch of panicle.