Cyperus pennatiformis, a member of the Cyperaceae (sedge) family, is a short-lived perennial plant with a woody root system covered with brown scales. The stout, smooth, three-angled stems are between 0.4 and 1.2 m (1.3 and 4 ft) long, slightly concave, and 3 to 7 mm (0.1 to 0.3 in) in diameter in...