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''Najas guadalupensis'' (najas grass or guppy grass) is a species of aquatic plant known by the common names southern waternymph and common water nymph. It is native to the Americas, where it is widespread. It is considered native to Central Canada from Alberta to Quebec, plus most of the contiguous United States, Mexico, Central America, the West Indies and South America. It is naturalized in Japan, Israel and Palestine.〔(Flora of North America v 22, ''Najas guadalupensis'' )〕 ''Najas guadalupensis'' is an annual, growing submerged in aquatic habitat types such as ponds, ditches, and streams. It produces a slender, branching stem up to 60 to 90 centimeters in maximum length. The thin, somewhat transparent, flexible leaves are up to 3 centimeters long and just 1 or 2 millimeters wide. They are edged with minute, unicellular teeth. Tiny flowers occur in the leaf axils; staminate flowers grow toward the end of the plant and pistillate closer to the base.〔〔Magnus, Paul Wilhelm. 1870. Beitrage zur Kenntniss der Gattung Najas viii. ''Najas guadalupensis''〕〔(Sprengel, Curt Polycarp Joachim. 1824. Systema Vegetabilium, editio decima sexta 1: 20, ''Caulinia guadalupensis'' )〕〔Subils, Rosa & Hunziker, Armando Theodoro. 1973.Lorentzia no. 2: 9, fig. 1, ''Najas arcana''〕〔Schmidt, Otto Christian. 1925. Repertorium Specierum Novarum Regni Vegetabilis. Centralblatt für Sammlung und Veroffentlichung von Einzeldiagnosen neuer Pflanzen 22: 99, ''Najas urbaniana''〕 ==Subspecies== Numerous varietal and subspecific names have been proposed. Only 4 are currently recognized:〔〔(Kew World Checklist of Selected Plant Families, genus ''Najas'' )〕 *''Najas guadalupensis'' subsp. ''floridana'' (R.R.Haynes & Wentz) R.R.Haynes & Hellq - Alabama, Florida, and Georgia (U.S. state); naturalized in Japan〔(Haynes, Robert Ralph & Hellquist, C. Baare. 1996. New combinations in North American Alismatidae. Novon 6(4): 370-371 )〕 *''Najas guadalupensis'' subsp. ''guadalupensis'' *''Najas guadalupensis'' subsp. ''muenscheri'' (R.T.Clausen) R.R.Haynes & Hellq. - New York State〔 *''Najas guadalupensis'' subsp. ''olivacea'' (Rosend. & Butters) R.R.Haynes & Hellq. - Canada (Manitoba, Ontario, Quebec) and northern United States (Iowa, Minnesota, Indiana, Michigan, New York State)〔 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 guadalupensis」の詳細全文を読む スポンサード リンク
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