Cyperus difformis

Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Monocots
Cladus: Commelinids
Ordo: Poales

Familia: Cyperaceae
Subfamilia: Cyperoideae
Tribus: Cypereae
Genus: Cyperus
Species: Cyperus difformis
Name

Cyperus difformis L., Cent. Pl. II: 6 (1756).
Synonyms

Heterotypic
Cyperus protractus Link, Enum. Hort. Berol. Alt. 1: 45 (1821), nom. illeg.
Cyperus holoschoenoides Jan ex Schult., Mant. 2: 111 (1824).
Cyperus viridis Willd. ex Kunth, Enum. Pl. 2: 38 (1837), nom. illeg.
Cyperus subrotundus Llanos, Fragm. Pl. Filip.: 14 (1851).
Cyperus goeringii Steud., Syn. Pl. Glumac. 2: 24 (1854).
Cyperus oryzetorum Steud., Syn. Pl. Glumac. 2: 24 (1854).
Cyperus lateriflorus Torr. in W.H.Emory, Rep. U.S. Mex. Bound. 2(1): 226 (1858), nom. illeg.
Cyperus difformis f. humilis Debeaux, Actes Soc. Linn. Bordeaux 1: 144 (1876).
Cyperus difformis f. maximus C.B.Clarke, J. Linn. Soc., Bot. 21: 135 (1884).
Cyperus difformis var. breviglobosus Kük. in H.G.A.Engler (ed.), Pflanzenr., IV, 20(101): 240 (1936).
Cyperus difformis var. subdecompositus Kük. in H.G.A.Engler (ed.), Pflanzenr., IV, 20(101): 240 (1936).

Distribution
Native distribution areas:

Continental: Trop. & Subtrop. Old World
Afghanistan; Albania; Andaman Is.; Angola; Azores; Bangladesh; Benin; Botswana; Bulgaria; Burkina; Burundi; Cameroon; Cape Provinces; Caprivi Strip; Central African Repu; Chad; Chagos Archipelago; China North-Central; China South-Central; China Southeast; Comoros; Congo; Cook Is.; Corse; East Himalaya; Ecuador; Egypt; Equatorial Guinea; Ethiopia; Fiji; France; Free State; Gabon; Gambia; Ghana; Greece; Guinea; Guinea-Bissau; Gulf of Guinea Is.; Guyana; Hainan; India; Inner Mongolia; Iran; Iraq; Italy; Ivory Coast; Japan; Jawa; Kazakhstan; Kazan-retto; Kenya; Kirgizstan; Korea; Kriti; KwaZulu-Natal; Lesotho; Lesser Sunda Is.; Liberia; Libya; Louisiana; Madagascar; Madeira; Malawi; Malaya; Mali; Manchuria; Marianas; Mauritania; Mauritius; Mexico Northeast; Mexico Northwest; Morocco; Myanmar; Namibia; Nansei-shoto; Nepal; Nicobar Is.; Niger; Nigeria; Ogasawara-shoto; Oklahoma; Oregon; Pakistan; Palestine; Portugal; Primorye; Romania; Runion; Rwanda; Sardegna; Senegal; Seychelles; Sicilia; Sierra Leone; Socotra; Somalia; Spain; Sri Lanka; St.Helena; Sudan; Sulawesi; Sumatera; Swaziland; Tadzhikistan; Taiwan; Tanzania; Thailand; Togo; Tokelau-Manihiki; Transcaucasus; Turkey; Turkey-in-Europe; Uganda; Ukraine; Uzbekistan; Vietnam; West Himalaya; Windward Is.; Xinjiang; Yemen; Yugoslavia; Zare

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition

References
Primary references

Linnaeus, C. 1756. Centuria II. Plantarum. Upsaliae, exc. L.M. Höjer. BHL Reference page. : II::6.

Links

Govaerts, R. et al. 2020. Cyperus difformis in World Checklist of Selected Plant Families. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2020 Feb 07. Reference page.
International Plant Names Index. 2020. Cyperus difformis. Published online. Accessed: Feb 07 2020.
Govaerts, R. et al. 2020. Cyperus difformis in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2020 Feb 07. Reference page.
Tropicos.org 2020. Cyperus difformis. Missouri Botanical Garden. Published on the internet. Accessed: 2020 Feb 07.
USDA, ARS, Germplasm Resources Information Network. Cyperus difformis in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 08-Apr-12.

Vernacular names
русский: Сыть разнородная

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 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

Kew World Checklist of Selected Plant Families
"Cyperus difformis". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 17 January 2016.
"Cyperus difformis". FloraBase. Western Australian Government Department of Parks and Wildlife.
Altervista Flora Italiana, Zigolo delle risaie, Cyperus difformis L. includes photos plus range maps for Europe and North America
Miller, A.G. & Morris, M. (2004). Ethnoflora of Soqotra Archipelago: 1-759. The Royal Botanic Garden, Edinburgh.
Sita, P. & Moutsambote, J.-M. (2005). Catalogue des plantes vasculaires du Congo , ed. sept. 2005: 1-158. ORSTOM, Centre de Brazzaville.
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.
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.
Sosef, M.S.M. & al. (2006). Check-list des plantes vasculaires du Gabon. Scripta Botanica Belgica 35: 1-438.
Figueiredo, E. & Smith, G.F. (2008). Plants of Angola. Strelitzia 22: 1-279. National Botanical Institute, Pretoria
Hoenselaar, K., Verdcourt, B. & Beentje, H. (2010). Cyperaceae. Flora of Tropical East Africa: 1-466.
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.
Flora of China, Vol. 23 Page 226, 异型莎草 yi xing suo cao, Cyperus difformis Linnaeus, Cent. Pl. 2: 6. 1756.
Flora of North America, Vol. 23 Page 156, Cyperus difformis Linnaeus, Cent. Pl. II. 6. 1756.