Cyperus difformis

Cyperus difformis is a species of sedge known by several common names, including variable flatsedge,[2] smallflower umbrella-sedge and rice sedge.[3] This plant is native to southern Europe, most of Africa and Asia, and Australia, and it is naturalized in other areas of the world, including large parts of the Americas.[1][4][5][6][7][8][9][10][11][12]

Cyperus difformis
Scientific classification
Kingdom: Plantae
Clade: Tracheophytes
Clade: Angiosperms
Clade: Monocots
Clade: Commelinids
Order: Poales
Family: Cyperaceae
Genus: Cyperus
Species:
C. difformis
Binomial name
Cyperus difformis
Occurrence data from GBIF
Synonyms[1]
  • Cyperus lateriflorus Torr. 1859, illegitimate homonym, not Steud. 1829
  • Cyperus protractus Link 1821, illegitimate homonym, not Delile 1813
  • Cyperus viridis Willd. ex Kunth 1837, illegitimate homonym, not Krock. 1787 nor Sieber ex C. Presl 1828 nor Roxb. ex C.B. Clarke 1884
  • Cyperus holoschoenoides Jan ex Schult.
  • Cyperus subrotundus Llanos
  • Cyperus goeringii Steud.
  • Cyperus oryzetorum Steud.

Cyperus difformis is a plant of aquatic and moist habitats. It is a weed of rice fields, but not generally a troublesome one. This is an annual herb with one to many thin, soft erect stems reaching over 30 centimeters in maximum height. There are usually a few long, wispy leaves around the base of the plant. The inflorescence is a rounded bundle one to three centimeters wide, containing up to 120 spikelets, each long and partially or entirely covered in up to 30 bracted flowers. The flowers are light brown with areas darker brown and sometimes a yellowish or purplish tint.[13][14]

References
  1. Kew World Checklist of Selected Plant Families
  2. "Cyperus difformis". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 17 January 2016.
  3. "Cyperus difformis". FloraBase. Western Australian Government Department of Parks and Wildlife.
  4. Altervista Flora Italiana, Zigolo delle risaie, Cyperus difformis L. includes photos plus range maps for Europe and North America
  5. Miller, A.G. & Morris, M. (2004). Ethnoflora of Soqotra Archipelago: 1-759. The Royal Botanic Garden, Edinburgh.
  6. Sita, P. & Moutsambote, J.-M. (2005). Catalogue des plantes vasculaires du Congo , ed. sept. 2005: 1-158. ORSTOM, Centre de Brazzaville.
  7. Acevedo-Rodríguez, P. & Strong, M.T. (2005). Monocotyledons and Gymnosperms of Puerto Rico and the Virgin Islands. Contributions from the United States National Herbarium 52: 1-415.
  8. Tanaka, N., Koyama, T. & Murata, J. (2005). The flowering plants of Mt. Popa, central Myanmar - Results of Myanmar-Japanese joint expeditions, 2000-2004. Makinoa 5: 1-102.
  9. Sosef, M.S.M. & al. (2006). Check-list des plantes vasculaires du Gabon. Scripta Botanica Belgica 35: 1-438.
  10. Figueiredo, E. & Smith, G.F. (2008). Plants of Angola. Strelitzia 22: 1-279. National Botanical Institute, Pretoria
  11. Hoenselaar, K., Verdcourt, B. & Beentje, H. (2010). Cyperaceae. Flora of Tropical East Africa: 1-466.
  12. Figueiredo, E., Paiva, J., Stévart, T., Oliveira, F. & Smith, G.F. (2011). Annotated catalogue of the flowering plants of São Tomé and Príncipe. Bothalia 41: 41-82.
  13. Flora of China, Vol. 23 Page 226, 异型莎草 yi xing suo cao, Cyperus difformis Linnaeus, Cent. Pl. 2: 6. 1756.
  14. Flora of North America, Vol. 23 Page 156, Cyperus difformis Linnaeus, Cent. Pl. II. 6. 1756.


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