White Water-lily
Nymphaea alba

The white water-lily grows in lakes and is entirely aquatic and covers the surface of still or slow-flowing fresh water. They either float on or rise above the surface of the water and it roots in the mud at the lake bottom. It has large, rounded dark green leaves and white flowers, that only open in bright sunshine. After pollination the flower sinks below the surface of the water where it develops into a large spongy, wart-covered capsule that contains many seeds.