Nuphar pumila, the least water-lily or small yellow pond-lily, is an aquatic perennial plant in the Nymphaeaceae family. It is also known as dwarf water lily because it is the dwarf species of Nuphar lutea; while Nuphar lutea has a star-shaped form of the stigma disc and glabrous leaf undersides, Nuphar pumila has a round stigma disc and the undersides of its leaves are fine-haired. Its flowers bloom from July to August and are typically pollinated by flies.