Nuphar japonica, known as East Asian yellow water-lily,[2] is a perennial,[3] aquatic, rhizomatous,[1] herb[4] in the family Nymphaeaceae native to Japan, Korea, and Russia.

[1] Nuphar japonica is one of three species in the genus Nuphar that is dispersed in the same geographical location of the Saijo Basin, an area in the Hiroshima Prefecture of Japan.

[5] Nuphar japonica is a perennial,[3] aquatic, rhizomatous,[1] herb[4] with 1–3 cm thick rhizomes.

[7] The yellow to red,[3] solitary,[4] 4–5 cm wide flowers[10] have a long, cylindrical peduncle.

[15] The specific epithet japonica means of Japan.