Nuphar lutea subsp. advena
Nuphar advena (spatterdock or yellow pond-lily) is a species of Nuphar native throughout the eastern United States, and just into the extreme south of Canada. It is similar to the Eurasian species N. lutea, and is treated as a subspecies of it by some botanists, though differing significantly in genetics.
Medicinal and food uses
Spatterdock was long used in traditional medicine, with the root applied to the skin and/or both the root and seeds eaten for a variety of conditions. The seeds are edible, and can be ground into flour. The root is edible too, but can prove to be incredibly bitter in some plants.