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''Nuphar'' is genus of aquatic plants in the family Nymphaeaceae, with a temperate to subarctic Northern Hemisphere distribution. Common names include water-lily (Eurasian species; shared with many other genera in the same family), pond-lily, and spatterdock (North American species). A total of eight species and three hybrids are currently accepted in the genus.〔USDA Germplasm Resources Information Network: (''Nuphar'' )〕 A few botanists treat the genus as just a single variable species (for which the European name ''N. lutea'' has priority),〔USDA Plants Profile (''Nuphar'' )〕 while 10–12 or more species are accepted by some other authorities. Recent molecular work has shown that there are substantial differences between the Eurasian species (sect. ''Nuphar'') and American species (sect. ''Astylus''), except for North American ''N. microphylla'' which is clusters with the Eurasian species.〔〔Padgett, D. J. (2007). A Monograph of Nuphar (Nymphaeaceae). ''Rhodora'' 109: 1–95 (full text ).〕 The genus is closely related to ''Nymphaea''. ''Nuphar'' differs in having its petals being much smaller than its 4-6 bright yellow-coloured sepals, whereas in ''Nymphaea'', the petals are much larger than the sepals. The fruit maturation also differs, with ''Nuphar'' fruit being held above water level to maturity, whereas ''Nymphaea'' fruit sink below the water level immediately after the flower closes. Both genera share leaves with a radial notch from the circumference to the petiole (leaf stem) in the centre. ==Species== * ''Nuphar advena'' (Aiton) W.T.Aiton –Spatterdock * ''Nuphar japonica'' DC. * ''Nuphar lutea'' (L.) Sm. – Yellow water-lily (type species) * ''Nuphar microphylla'' (Pers.) Fernald * ''Nuphar polysepala'' Engelm. * ''Nuphar pumila'' (Timm) DC. – Least water-lily * ''Nuphar saggitifolia'' (Walter) Pursh * ''Nuphar variegata'' Engelm. ex Durand – Variegated pond-lily 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「Nuphar」の詳細全文を読む スポンサード リンク
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