Nuphar subintegerrima is a species of rhizomatous aquatic plant endemic to Japan.

[2] The pedunculate, solitary, yellow flower extends above the water surface.

[4] It was first described by Robert Caspary as the variety Nuphar japonica var.

It was elevated to the species Nuphar subintegerrima (Casp.)

[3] The larvae of the moth species Neoschoenobia testacealis feed on leaves and flower stalks of Nuphar subintegerrima.