This is the flower of the nuphar, a species older than North America and the probable ancestor of both lotus and water lilies around the world.
These winter hardy water lilies have a cleft in their leaf like the nuphar and the lotus where the cleft has sealed. Like the nuphar the leaf is leathery, and like the lotus there are rings of stamens.
The lotus grows tall in the ponds shading out its cousin the water lily. The leaves have waxy bubbles that shed water. Both water lilies and lotus have a cleft leaf, but in the lotus the cleft has sealed. Like the nuphar it produces seed in a multi-chambered ovary at the center of the flower.
Did You Know?
The top of the lotus leaf is covered with wax pebbles, making it better at shedding water than a plain wax surface. This surface is being copied for rain ware.