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''Egeria'' is a genus of two species of aquatic plants in the family Hydrocharitaceae described as a genus in 1849.〔Planchon, Jules Émile. 1849. Annales des Sciences Naturelles; Botanique, sér. 3 11: 79〕〔(Tropicos, ''Egeria'' Planch. )〕 native to warm-temperate South America.〔(Kew World Checklist of Selected Plant Families )〕 The genus was formerly included in the related genus ''Elodea'', from which it differs in having the leaves in whorls of four or more, not three, and in having more conspicuous flowers with larger (particularly broader) petals.〔Flora of North America: (''Egeria'' )〕〔Huxley, A., ed. (1992). ''New RHS Dictionary of Gardening''. Macmillan ISBN 0-333-47494-5.〕 ''Egeria'' is found in many temperate and subtropical regions throughout the world as an introduced, or "alien", species, meaning a species that does not originate from the area in which it is found. In many places, particularly in Europe, fast-growing, adaptable plants such as ''Egeria'' can spread quickly and cause major damage to native plants and wildlife.〔Hisock, Peter. (2005). ''Aquarium Plants (Mini Encyclopedia),'' p. 146. NY: Barrons. ISBN 0-7641-2989-9.〕 ;Species〔 # ''Egeria densa'' Planch. - S + SE Brazil, NE Argentina, Paraguay, Uruguay; naturalized in scattered locales in Europe, Africa, China, New Zealand, Hawaii, USA, Mesoamerica, West Indies # ''Egeria heterostemon'' S.Koehler & C.P.Bove - Brazil # ''Egeria najas'' Planch. - S + SE + E Brazil, NE Argentina, Paraguay, Uruguay ==References== 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「Egeria (plant)」の詳細全文を読む スポンサード リンク
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