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''Salvinia'', a genus in the family Salviniaceae, is a floating fern named in honor of Anton Maria Salvini, a 17th-century Italian scientist. Watermoss is a common name for ''Salvinia''. The genus was published in 1754 by Jean-François Séguier, in his description of the plants found round Verona, ''Plantae Veronenses''〔''Pl. Veron.'' 3: 52. 1754.〕 There are currently twelve species recognized, at least three of which (''S. molesta'', ''S. herzogii'', and ''S. minima'') are believed to be hybrids, in part because their sporangia are found to be empty. ''Salvinia'' is related to the other water ferns, including the mosquito fern ''Azolla''. Recent sources include both ''Azolla'' and ''Salvinia'' in Salviniaceae, although each genus was formerly given its own family. ''Salvinia'', like the other ferns in order Salviniales are heterosporous, producing spores of differing sizes. However, leaf development in ''Salvinia'' is unique. The upper side of the floating leaf, which appears to face the stem axis, is morphologically abaxial.〔J. G. Croxdale 1978, 1979, 1981.〕 From a human point of view, when their growth is robust the plants pose a particular hindrance on certain lakes, having choked off much of the water in Lake Bistineau near Doyline in Webster Parish, Louisiana. Other problems have persisted in a second Webster Parish site, Caney Lakes Recreation Area.〔(【引用サイトリンク】title=Lake Bistineau Salvinia Information Page )〕 ==Distribution== Distribution is mostly tropical, in North America, Mexico, West Indies, Central America, South America, Eurasia and Africa, including Madagascar, South Borneo 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「salvinia」の詳細全文を読む スポンサード リンク
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