The Collaborative International Dictionary
Nuphar advena
Spatter-dock \Spat`ter-dock`\, n. (Bot.) The common yellow water lily ( Nuphar advena).
Wikipedia
Nuphar advena
Nuphar advena (spatterdock or cow lily or yellow pond-lily) is a species of Nuphar native throughout the eastern United States and at least some parts of Canada, such as Nova Scotia. 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.
It is locally naturalized in Britain.
Usage examples of "nuphar advena".
The European Yellow Pond-Lily (Nuphar Advena or Nuphar luteum - Spatterdock or Frog-lily) may be used as a substitute.