Nuphar lutea
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 pumila" has a star-shaped, or lobed form of the stigma disc and glabrous leaf undersides, "Nuphar lutea" has a round stigma disc and the undersides of its leaves are occasionally fine-haired on the midribs. Its flowers bloom from July to August and are typically pollinated by flies.