Floating and emersed leaves 5 to 12 inches long and 5 to 9 inches broad, ovate or orbicular-oval, thick, with a sinus 2 to 5 inches deep and generally open; submerged leaves, when present, thin and membranous; petioles, peduncles and lower surfaces of the leaves usually pubescent. Flowers 1 ½ to 2½ inches broad, depressed, globose, yellow, usually tinged with purple within; sepals six, oblong; petals fleshy, oblong truncate, one-half to two-thirds of an inch long; stamens numerous in five to seven rows; carpels numerous, united into a compound pistil which is surmounted by an undulate, yellow or pale-red stigmatic disc with twelve to twenty-four rays, ripening into an ovoid, berrylike fruit, 1 to 2 inches long and about 1 inch thick, maintained at the surface of the water or above it.
Memoir 15 N. Y. State Museum
Large Yellow Pond Lily; Spatter-Dock - Nymphaea advena
In ponds, lakes, slow streams or often subterrestrial in boggy meadows, Labrador and Nova Scotia to the Rocky mountains, south to Florida, Texas and Utah. Flowering from May to September. Consists of several races or perhaps species, differing in the character of the pistil, stigmatic disc and leaf outline. In the lakes and ponds throughout the north the small Yellow Pond Lily (Nymphaea microphylla Persoon) is also found, with flowers 1 inch broad or less, and small leaves 2 to 4 inches long and 1 to 3 inches broad. The northern form of the larger Yellow Pond Lily is described in some books under the name of Nymphaeavari -egata (Morong) Greene, and a hybrid between the two, Nymphaea rubrodisca (Morong) Greene, is of frequent occurrence, having fewer stigmatic rays than N. variegata and spatulate petals. Our illustration is from a plant on Long Island.