Cyperus, a large genus of Cyperaceæ, chiefly tropical. The tubers or root-stocks of some species are edible, notably C. esculentus, cultivated in southern Europe for its amandes de terre. C. longus and others are used in medicine and perfumery. C. textilis of South Africa yields fibre. In America,
C. hydra, a tuberous species, is an exceedingly troublesome weed in cultivated lands, such as cotton-fields.