Nuphar × rubrodisca is a species of rhizomatous aquatic plant native to Canada and the USA. It is a natural hybrid of Nuphar variegata and Nuphar microphylla.[1]
Nuphar × rubrodisca has 1–2.5 cm wide rhizomes. The petiolate leaves float on the water surface, or are more rarely submersed.
The red stigmatic disk has 8-15 stigmatic rays.[2]
It can reproduce vegetatively through rhizome fragments.
It can be sterile or fertile.[3] The fertility rates are much lower than those of the parental species.
It was first described by Thomas Morong in 1886.
Hybridisation events of both parental species are believed to have occurred many times independently from each other.
It occurs in streams, tidal waters, ponds, and lakes at elevations of 0–400 m above sea level. It occurs almost exclusively within the overlapping ranges of the parental species.[4]