there is a conspicuous gap separating petals from stamens.

[4] It was published by Robert Caspary as Nymphaea subsect.

[7][4] The type species is Nymphaea gigantea Hook.

[4] Species of this subgenus occur in lagoons, lakes, ponds, creeks, artificial dams, and billabongs.

[4] Species of this subgenus are uncommon in cultivation, as they are more difficult to grow compared to the Nymphaea species of other subgenera.