Nuphar variegata

Nuphar variegata (variegated pond-lily, bullhead pond-lily or yellow pond-lily ) is a plant in the water lily family, Nymphaeaceae. It is native to much of Canada and the northernmost of the United States.

Description
Nuphar variegata is an aquatic plant with alternate, simple leaves, on submerged stems. The leaves tend to float on the surface of the water, rather than emerge above as in other Canadian species of Nuphar. The flowers are yellow, borne in summer.

Publication
The species Nuphar variegata Engelm. ex Durand was first validly published by Elias Durand in 1866 based on previous work by George Engelmann.