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Salvinia minima
''Salvinia minima'' is a species of aquatic, floating fern that grows on the surface of still waterways.〔"Salvinia minima." Global Invasive Species Database. Edited 4 Oct 2010. http://www.issg.org/database/species/ecology.asp?si=570&fr=1&sts=&lang=EN〕 It is usually referred to as common salvinia or water spangles. ''Salvinia minima'' is native to South America, Mesoamerica, and the West Indies and was introduced to the United States in the 1920s-1930s.〔Jacono, C.C., Davern, T.R., Center, T.D. (2001) "The Adventive Status of ''Salvinia minima'' and ''S. molesta'' in the Southern United States and the Related Distribution of the Weevil ''Cyrtobagous salviniae''." ''Castenea''. 66:214-226. http://fl.biology.usgs.gov/posters/Nonindigenous/Status_of_Salvinia/status_of_salvinia.html〕 It is classified as an invasive species internationally and can be detrimental to native habitats.〔"Common Salvinia." ''Louisiana Invasive Species.'' Tulane/Xavier Center for Bioenvironmental Research. Edited 2010. http://is.cbr.tulane.edu/Species_CommonSalvinia.html〕 This species is similar to but should not be confused with giant salvinia, ''Salvinia molesta''.
==Description==
The leaves of ''Salvinia minima'' are small and oval, ranging from 0.4 to 2 centimeters in length.〔 Each rhizome of the fern floats close to the surface and has a joined set of leaves that branch off horizontally.〔 The leaves grow in joined sets of three, with two leaves floating on the surface and one leaf dissected, hanging underneath.〔''Salvinia minima''. Center for Aquatic and Invasive Plants. University of Florida. http://plants.ifas.ufl.edu/node/395〕 This species is rootless but the dissected leaves that hang down act as root-like structures and are longer than the floating leaves.〔 Fine white hairs grow uniformly on the leaf surface and serve to repel water. The hairs grow close together in groups of four, bending out and touching together at their top ends to form a whisk or eggbeater-like shape. There are longer brown hairs present on the underside of leaves as well.〔Kaufman, S.R.; Kaufman, W. (2007). ''Invasive Plants: Guide to Identification and the Impacts and Control of Common North American Species.'' Stackpole Books: Mechanicsburg, PA. Pg 439-441.〕 Leaves range from bright green to brown in color, often browning with age and in sunlight.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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