Grass Family (Poaceae). Big cordgrass is a warm season, robust, rhizomatous perennial. The height ranges from 3 to 10 feet. The leaf blade is flat and 1/2 to 1 inch wide; often 18 to 24 inches long; rough and sharp margin. The leaf sheath is rounded. The ligule has short membrane and densely hairy. The stem is thick, round and often 3/4 inch in diameter at base. The seedhead has 20 to 40 spikes, each about 3 inches long, and spikelets about 1/2 inch long growing on one side of rachis with the seedhead growing 12 to 18 inches long.
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