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''Najas'', the waternymphs or naiads, is a genus of aquatic plants. It is cosmopolitan in distribution, first described for modern science by Linnaeus in 1753. Until 1997, it was rarely placed in the Hydrocharitaceae,〔〔 and was often taken as constituting (by itself) the family ''Najadaceae''.〔(197. Najadaceae A. L. de Jussieu ), ''Flora of North America''〕 The APG II system, of 2003 (unchanged from the APG system, of 1998), places the genus in family Hydrocharitaceae, in the order Alismatales of the monocots.〔 ;Species〔 # ''Najas affinis'' Rendle - South America, Senegal, Guinea-Bissau # ''Najas ancistrocarpa'' A.Braun ex Magnus - China, Japan, Taiwan # ''Najas arguta'' Kunth - Cuba, Costa Rica, Panama, South America # ''Najas australis'' Bory ex Rendle - India, Madagascar, Mauritius, KwaZulu-Natal, Seychelles # ''Najas baldwinii'' Horn - West Africa # ''Najas brevistyla'' Rendle - Assam # ''Najas browniana'' Rendle - southern China, India, Taiwan, Java, Cavern Island in Northern Territory of Australia # ''Najas chinensis'' N.Z.Wang - Primorye, China, Taiwan, Japan # ''Najas conferta'' (A.Braun) A.Braun - Cuba, Hispaniola, Panama, Brazil # ''Najas faveolata'' A. Br. ex Magnus # ''Najas filifolia'' R.R.Haynes - southeastern United States (Georgia, Alabama, Florida) # ''Najas flexilis'' (Willd.) Rostk. & W.L.E. Schmidt (1824) - temperate Northern Hemisphere # ''Najas gracillima'' (A.Braun ex Engelm.) Magnus - Asia, North America # ''Najas graminea'' Delile (1813) - Africa, Asia, New Guinea, Melanesia, northern Australia; naturalized in California and parts of Europe # ''Najas grossareolata'' L.Triest - Sri Lanka # ''Najas guadalupensis'' (Spreng.) Magnus - North and South America, Caribbean # ''Najas hagerupii'' Horn - Ghana, Mali # ''Najas halophila'' L.Triest - Java, New Guinea, Queensland # ''Najas heteromorpha'' Griff. ex Voigt - eastern India # ''Najas horrida'' A.Braun ex Magnus - Africa, Madagascar, Sinai # ''Najas indica'' (Willd.) Cham. (1829) - Indian Subcontinent, China, Southeast Asia, New Guinea # ''Najas kurziana '' Rendle - Bihar, East Timor # ''Najas madagascariensis'' Rendle - Madagascar; naturalized in Mauritius # ''Najas malesiana'' W.J.de Wilde - India, Bangladesh, Indochina, Malaysia, Indonesia, Philippines; naturalized in eastern Brazil # ''Najas marina'' L. (1753) - widespread and nearly cosmopolitan # ''Najas minor'' All. (1773) - widespread in Europe, Asia, Africa; naturalized in eastern North America # ''Najas oguraensis'' Miki - East Asia, Himalayas (Pakistan, Nepal, northern India) # ''Najas pectinata'' (Parl.) Magnus - Sahara # ''Najas pseudogracillima'' L.Triest - Hong Kong # ''Najas rigida'' Griff. - eastern India # ''Najas schweinfurthii'' Magnus - Senegal, Cameroon, Ethiopia, Sudan, Tanzania # ''Najas tenuicaulis'' Miki - Honshu Island in Japan # ''Najas tenuifolia'' R.Br. - Hong Kong, Southeast Asia, Australia # ''Najas tenuis'' Magnus – India, Sri Lanka, Myanmar # ''Najas tenuissima'' (A.Braun ex Magnus) Magnus - Finland, Russia, Hokkaido # ''Najas testui'' Rendle - western + central Africa # ''Najas welwitschii'' Rendle - tropical Africa, western India # ''Najas wrightiana'' A.Braun - Mexico, Central America, Cuba, Bahamas, Venezuela; naturalized in Florida ==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「Najas」の詳細全文を読む スポンサード リンク
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