Cyperus, from the Greek name for this plant, cyperus edge, referring to the sharp edges on the leaves of many species. Sedges are herbs usually found in moist areas. Stems maybe angular, often 3-sided, internodes solid. The grass-like leaves have a leaf-sheath which is usually closed unlike grasses and there is no ligule. Spikelets are subtended by one or more glumes, perianth is absent or replaced by bristles etc. Stamens 1-3, anthers basifixed, connective often forms an appendage. Fruit is an achene or nut, style often persistent.