|Cyperus polystachyos flower head|
Sedges include many wild marsh and grassland plants, and some cultivated ones such as water chestnut (Eleocharis dulcis) and papyrus sedge (Cyperus papyrus). These species are widely distributed, with many in tropical Asia and tropical South America. Sedges may be found growing in almost all environments. Many are wetlands, or have poor soils. Ecological communities dominated by sedges are known as sedgelands.
Features distinguishing members of the sedge family from grasses or rushes are stems with triangular cross-sections (with occasional exceptions) and leaves that are spirally arranged in three ranks (grasses have alternate leaves forming two ranks).
- "Cyperaceae". Plants of the World Online. Royal Botanic Gardens, Kew. 
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- Hipp, Andrew L. 2007. Nonuniform processes of chromosome evolution in sedges (Carex: Cyperaceae). Evolution 61, 2175–2194. 
- "Grasslike non-grasses".
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- Speer, Brian R. 1995. Glumiflorae: more on morphology. University of California, Berkeley .