Cyperaceae. Sedge family. 
Grass-like or rush-like herbs with fibrous roots, either annual 
or perennial by more or less conspicuous rootstocks. Stems (culms) solid, 
rarely hollow, commonly triangular, often columnar, sometimes Patten: 
Leaves alternate, often d-ranked, narrow, the blades usually flattened or trough 
shaped, the sheathing portion closed and completely tubular. Flowers perfect or 
imperfsct, arranged in spikelets, each (rarely 2) in the axil of ‘ick bract 
(scale or glume), the spikelets solitary or variously clustered, l-many flowered. 
Bracts 2-ranked or spirally imbricated, persistent or deciduous. Perianth 
composed of bristles or scales or wanting. Stamens 1-3. Pistil 1, the ovary 
1l-chambered with a single ovule, the style 2-3-cleft. Fruit an achene, either 
d-angled or lenticular, frequently flat on one surface, convex on the other. 
