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Purple nutsedge, Cyperus rotundus

  Perennial from tubers and underground runners.  Tubers are bitter to taste.  Stems triangular, from 4 inches to 1 ½ feet tall.  Leaf blades 1/16 to ¼ inch wide, basal blades usually shorter than the seedhead.  Leaf tips abruptly tapering to a sharp point, often described as “boat shaped”.  Seedheads with 2-4 inconspicuous leaves below.  Seedheads reddish or reddish purple, 1 ¼ to 3 ¾ inches long and 1 ½ to 2 ¾ inches wide.  Seedheads with several unequal stalks each bearing 3 to 9 thin, spreading or ascending spikes.  Seed is grayish, less than 1/16 inch long, and three-angled.  Propagation is primarily by tubers and runners, but occasionally by seed.