Everyone has seen Yellow Pond-lily's on lakes and slow moving streams and called them anything from Bullhead Lily to Spatterdock to Water Lily and who knows what else. It seems that the taxonomists can't agree on this plant at all, some saying that there is only one Nuphar species in the whole world, this one, Nuphar lutea, while others split it into a bunch of separate species.
So this one could be called Nuphar lutea (L.) Sm. ssp. advena (Aiton) Kartesz & Gandhi, or it could simply be called Nuphar advena.
I tend to be more of a lumper than a splitter, so I'm happy with calling them all the same thing and then enjoying the rest of my canoe trip.