Yellow Nutsedge

Cyperus esculentus ( Chufa Sedge , Yellow Nutsedge , Tigernut Sedge , Earthalmond ) is a species of sedge native to warm temperate to subtropical regions of the Northern Hemisphere . It is an annual or perennial plant, growing to 90 cm tall, with solitary stems growing from a tuber . The stems are triangular in section, and bear slender leaves 3-10 mm wide. The flowers of the plant are distinctive, with a cluster of flat oval seeds surrounded by four hanging leaf-like bracts positioned 90 degrees from each other. The plant foliage is very tough and fibrous, and is often mistaken for a grass .