|Cyperus polystachyos flower head|
About 109 (not all listed here)
Cyperaceae are a family of monocotyledonous graminoid flowering plants known as sedges, which superficially resemble grasses or rushes. The family is large, with some 5,500 species described in about 109 genera. These species are widely distributed, with the centers of diversity for the group occurring in tropical Asia and tropical South America. While sedges may be found growing in almost all environments, many are associated with wetlands, or with poor soils. Ecological communities dominated by sedges are known as sedgelands.
Features distinguishing members of the sedge family from grasses or rushes are that members of the sedge family have stems with triangular cross-sections (with occasional exceptions), and their leaves are spirally arranged in three ranks (grasses have alternate leaves forming two ranks).
Some well-known sedges include the water chestnut (Eleocharis dulcis) and the papyrus sedge (Cyperus papyrus), from which the Ancient Egyptian writing material was made. This family also includes cotton-grass (Eriophorum), spike-rush (Eleocharis), sawgrass (Cladium), nutsedge or nutgrass (Cyperus rotundus, a common lawn weed), the large genus of Carex, and white star sedge (Rhynchospora colorata).
Selected genera 
- R. Govaerts & D. A. Simpson, with J. Bruhl, T. Egorova, P. Goetghebeur & K. Wilson (2007). Word Checklist of Cyperaceae: Sedges. Royal Botanic Gardens, Kew. ISBN 978-1-84246-199-0.
- "Grasslike non-grasses".
- Peter W. Ball, A. A. Reznicek & David F. Murray. "210. Cyperaceae Jussieu". In Flora of North America Editorial Committee. Magnoliophyta: Commelinidae (in part): Cyperaceae. Flora of North America 23. Oxford University Press. ISBN 978-0-19-515207-4.
- Brian R. Speer (September 29, 1995). "Glumiflorae: More on Morphology". University of California, Berkeley. Retrieved March 23, 2007.
- Cyperaceae at The Plant List
- Cyperaceae at The Families of Flowering Plants (DELTA)
- Cyperaceae at the Encyclopedia of Life
- Cyperaceae at the Angiosperm Phylogeny Website
- Cyperaceae at the Royal Botanic Gardens, Kew
- Cyperaceae at the online Flora of North America
- Cyperaceae at the online Flora of Michigan
- Cyperaceae at the online Flora of Northern Ireland
- Cyperaceae at the online Flora of Zimbabwe
- Cyperaceae at the online Flora of Western Australia
- Cyperaceae at the online Flora of New South Wales
- Cyperaceae at the online Flora of New Zealand
- Cyperaceae at Flowers in Israel