Leaves orbicular, 5 to 12 inches in diameter, floating, green on both sides, sometimes slightly pubescent beneath, sinus open or closed. Root-stock thick, with numerous lateral tuberous-thickened branches which become detached and propagate the plant. Flowers white, 4 to 9 inches broad, slightly fragrant or inodorous; petals oblong, broader than those of C. odorata, obtuse. Fruit depressed-globose.
In shallow water of bays and protected coves, Lake Champlain, Lake George, Oneida lake and along the Great Lakes to Michigan, south to Delaware and eastern Nebraska and Arkansas. Flowering in July and August.
Memoir 15 N. Y. State Museum
Tuberous White Water Lily - Castalia tuberosa