睡蓮が開花する瞬間！ (かもしれません 2024)
スイレン（スイレン科）、世界の温帯および熱帯地域に自生する6属の淡水植物の58種のいずれか。スイレンのほとんどの種は、長い茎に丸みを帯びた、さまざまな切り欠きのあるワックスでコーティングされた葉を持っています。茎は多くの空間を含み、静かな淡水生息地に浮かんでいます。茎は、泥に埋められた、厚く、肉厚で、忍び寄る水中の茎から生じます。派手で香りの良い、孤立した花は、地下の茎に付いている長い茎の上または水面の上に生えています。それぞれのカップ状の花には、多数の花びらがらせん状に配置されています。
ほとんどの種の花には多くの雄しべ（雄の生殖構造）があります。花の中には、昆虫の受粉者を引き付けるために朝または夕方にのみ開くものがあります。果物は通常、ナッツ様またはベリー様です。いくつかの果物は、それらが破裂または腐敗するまで水中で熟し、その後種子が浮き上がるか、沈みます。一部のスイレンも、葉が水没しています。家族のすべてのメンバーは、アジアでのみ見られる一年生または短命の多年生植物であるエウライアーレ属を除いて、多年生です。
The genus Nymphaea makes up the water lilies proper, or water nymphs, with 46 species. The common North American white water lily, or pond lily, is Nymphaea odorata. The European white water lily is N. alba. Both species have reddish leaves when young and large fragrant flowers. The leaf blades of N. alba have a deep, narrow notch. Other species of Nymphaea have pink, yellow, red, or blue flowers; many kinds are of hybrid origin. The lotus of ancient Egyptian art was usually the blue lotus (N. caerulea). The Egyptian lotus, N. lotus, has toothed leaves and long stalks that rise above the water’s surface to support white flowers that bloom at night and stay open until midday.
The genus Nuphar, with about 10 species distributed throughout the Northern Hemisphere, includes the common yellow water lily, cow lily, or spatterdock (Nuphar advena) of eastern North America. The yellow water lily has submerged leaves that are thin and translucent and leathery floating leaves.
The largest water lilies are those of the tropical South American genus Victoria, comprising two species of giant water lilies. The leaf margins of both the Amazon, or royal, water lily (V. amazonica, formerly V. regia) and the Santa Cruz water lily (V. cruziana) have upturned edges, giving each thickly veined leaf the appearance of a large, shallow pan 60 to 180 cm (about 2 to 6 feet) across and accounting for its common name, water platter. The fragrant flowers of Victoria have 50 or more petals and are 18 to 46 cm (about 7 to 18 inches) wide. They open white toward evening and shade to pink or reddish two days later before they wither, to be replaced by a large berrylike fruit.
Water lilies provide food for fish and wildlife but sometimes cause drainage problems because of their rapid growth. Many varieties have been developed for ornamental use in garden pools and conservatories. Two aquatic families related to the water lilies are the water shields and the fanworts, making up the family Cabombaceae. Nymphaeaceae and Cabombaceae are members of the water lily order, Nymphaeales.
