Numerous species are introduced into many countries worldwide.
Cyperus brevifolius (Rottb.) Hassk., C. difformis and C. haspan L. are major weeds in rice fields in numerous countries worldwide.
Annual or perennial sedge. Stem compact, sometimes with creeping rhizome, usually triangular in cross-section. Leaves in basal rosette, linear and elongate or reduced to scale-like sheaths. Inflorescence terminal, of simple or compound umbels or heads; branches bearing multiple spikelets with distichous bractlets, subtending bracts leaf-like; spikelets 1- to many-flowered; bracts leaf-like. Perianth bristles absent.
all types of water-bodies
a large genus with ca. 900 species worldwide