Nuphar × porphyranthera

Nuphar × porphyranthera is a species of rhizomatous aquatic plant native to Great Britain. It is a hybrid of Nuphar lutea and Nuphar advena.

Vegetative characteristics
Nuphar × porphyranthera is an aquatic plant with predominantly emerging leaves.

Generative characteristics
The flowers have 5-6 sepals. The yellow filaments are 4.1–9.9 mm long. The sterile, purple or yellow anthers are 5–11 mm long. The fruit does not develop.

Generative reproduction
The hybrid is sterile.

Publication
It was first described by Lansdown & Ruhsam in 2022.

Natural hybridisation
Hybridisation occurred after introduction of the non-native Nuphar advena to Great Britain. It hybridised with the native species Nuphar lutea and formed the new hybrid Nuphar × porphyranthera.

Type specimen
The type specimen was collected from a shaded former gravel pit beneath trees in Ferry Lane, Shepperton, Middlesex, United Kingdom.

Habitat
It occurs in ornamental ponds, and in a gravel pit. It doesn't appear to spread into new habitats.