Family: Cyperaceae Description: One of the worlds worst weed, Height -15-60 cm.
- The plant is swollen and thickened at the base. It has triangular smooth scape, 10 to 60 cm in height, arising from the centre of a basal cluster of narrow grass like leaves of 30-50 cm long and 8 mm wide.
- The leaves are smooth shiny, dark green and grooved on the upper surface.
- The slender underground runners grow out from the base of the stem and form series of black, irregular shaped or nearly round tubers which are 2 cm in length. Tubers sprout to produce new plants while still attached to parent plant. - The inflorescence arises from stem apex. It consists of a number of slender branches which carries a cluster of spikelets at the end which are brown to dark brown in colour. Each spikelet consists of 10-30 small crowded florets which ripen to form black triangular nuts. - The rhizomes give rise to underground tubers which proliferates intensively. Tubers are concentrated in the surface 10 cm soil and store food and are effective means of propagation. New tubers are produced within 3 weeks after sprouting of individual tuber. Tubers have nodes, internodes and scale leaves.
- The plant is sensitive to shade.