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Nymphaea
''Nymphaea'' is a genus of hardy and tender aquatic plants in the family Nymphaeaceae. The genus has a cosmopolitan distribution. Many species are cultivated as ornamental plants, and many cultivars have been bred. Some taxa occur as introduced species where they are not native,〔(''Nymphaea''. ) Flora of North America.〕 and some are weeds.〔(''Nymphaea''. ) The Jepson eFlora 2013.〕 Plants of the genus are known commonly as water-lilies.〔〔(''Nymphaea''. ) Integrated Taxonomic Information System (ITIS).〕 The genus name is from the Greek νυμφαια, ''nymphaia'' and the Latin ''nymphaea'', which mean "water-lily" and were inspired by the nymphs of Greek and Latin mythology.〔
==Description==
Water-lilies are aquatic rhizomatous perennial herbs, sometimes with stolons, as well. The leaves grow from the rhizome on long petioles. Most of them float on the surface of the water. The blades have smooth or spine-toothed edges, and they can be rounded or pointed. The flowers rise out of the water or float on the surface, opening during the day or at night.〔 Many species of ''Nymphaea'' display protogynous flowering. The temporal separation of these female and male phases is physically reinforced by flower opening and closing, so that the first flower opening displays female pistil and then closes at the end of the female phase, and reopens with male stamens. Each has at least 8 petals in shades of white, pink, blue, or yellow. There are many stamens at the center.〔 Water-lily flowers are entomophilous, meaning they are pollinated by insects, often beetles.〔 The fruit is berry-like and borne on a curving or coiling peduncle.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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