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Yellow nutedge, Cyperus esculentus

 

Perennial from tubers and underground runners.  Tubers neutral or sweet to taste.  Stems 3-angled, from 6 inches to 2 ½ feet tall.  Leaf blades 1/16 to 7/16 inch wide, basal blades usually reaching or surpassing the seedhead.  Leaf tips long and very gradually tapering to a thin, sharp tip.  Seedheads with 3 to 7 conspicuous leaves just below.  Seedheads yellowish-brown to golden-brown, 1 5/8 to 6 inches long, and 1 7/8 to 6 inches wide.  Seedheads with 5 to 10 unequal stalks each bearing 12 to 50 thin, spreading spikes.  The seed is brown, less than 1/16 inch long, and three angled.  Propagation is by tubers, underground runners, and seed.  Yellow nutsedge is a particularly troublesome weed that can grow in all but the driest and wettest of habitats.