Cyperus Polystachyos Descriptive Essay
This article is about plants in the family Cyperaceae. For other uses of "sedge", see Sedge (disambiguation).
The Cyperaceae are a family of monocotyledonousgraminoidflowering plants known as sedges, which superficially resemble grasses and rushes. The family is large, with some 5,500 known species described in about 90 genera, the largest being the Carex genus of "true sedges" with over 2,000 species. These species are widely distributed, with the centers of diversity for the group occurring in tropicalAsia 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 stems with triangular cross-sections (with occasional exceptions) and leaves that 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 Egyptianwriting material was made. This family also includes cotton-grass (Eriophorum), spike-rush (Eleocharis), sawgrass (Cladium), nutsedge or nutgrass (Cyperus rotundus, a common lawn weed), and white star sedge (Rhynchospora colorata).
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- ^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.
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- ^Milne, Lorus Johnson; Milne, Margery Joan Greene (1975). Living plants of the world. Random House. p. 301.
- ^Hipp, Andrew L. (2007). "Nonuniform processes of chromosome evolution in sedges (Carex: Cyperaceae)"(PDF). Evolution. 61 (9): 2175–2194. doi:10.1111/j.1558-5646.2007.00183.x. ISSN 0014-3820. PMID 17767589.
- ^"Grasslike non-grasses". Backyard Nature. Retrieved December 30, 2014.
- ^Peter W. Ball; A. A. Reznicek; David F. Murray. "210. Cyperaceae Jussieu". In Flora of North Americaial 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.
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