Nymphoides peltata is a perennial, floating-leaved, rooted aquatic herb, colonial from rhizomes, stems stout, to 0.3 cm thick.
Leaves opposite, pair-members unequal in size, 5-15 cm long and wide, rounded, tip blunt, base slightly lobed, margin wavy-toothed.
Flowers yellow, to 2.5 cm wide petal lobes slightly fringed below, in small clusters, June-Sept.
Fruit capsule to 2.5 cm, beaked, seeds winged.
Wetland status: OBL.
Frequency in NYC: Infrequent. but aggressive and abundant where it occurs.
Habitat: Quiet water.