Great yellow pond-lily

''Nuphar polysepala'' is a species of ''Nuphar'' native to western North America. The name Nuphar is Greek for "water-lily" and polysepala means many sepals. It is commonly found in shallow muddy ponds from northern Alaska and Yukon southward to central California and northern New Mexico, and can be recognized easily by its large floating leaves and bright yellow blossoms.