Notonuphar is an extinct genus of water lily in the family Nymphaeaceae.

[1][2] During the Eocene, Antarctica was not yet glaciated and had a climate and ecosystem similar to the modern Valdivian temperate rain forest of Chile.

Notonuphar is the first discovered Antarctic fossil species known to have inhabited freshwater habitats.

Rivers may have washed Notonuphar seeds from these wetlands into the sea, where they later fossilized.

Notonuphar likely shared its freshwater habitat with an undescribed aquatic plant possibly related to Nelumbo, as well as a large, undescribed frog of the genus Calyptocephalella (which was found at the same type locality).