Nuphar × fluminalis


Nuphar × fluminalis is a species of rhizomatous aquatic plant endemic to Japan. It is a natural hybrid of Nuphar japonica and Nuphar submersa.

Description

Vegetative characteristics

Nuphar × fluminalis has an intermediate appearance and falls between Nuphar japonica and Nuphar submersa. The submerged leaves are ovate.

Generative characteristics

The filaments are recurved. The anthers display orange-red colouration. The stigmatic disk, as well as the fruit, also display orange-red colouration.

Reproduction

Generative reproduction

Sexual reproduction occurs within this hybrid.

Taxonomy

Publication

It was first described by Takashi Shiga and Yasuro Kadono in 2007.

Etymology

The nothospecific epithet fluminalis, from the Latin fluminalis, means stream or river.

Conservation

It is critically endangered. Only four populations are known.

Ecology

Habitat

It occurs in streams and rivers.