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Frogbit (Limnobium spongia) has two growth forms. The floating-leaved form has leathery, heart-shaped leaves that are deeply notched at the base and thick in the center. The emergent (out-of-water) leaved form has heart-shaped leaves that are not thick in the center and do not have a notch at the base of the leaf. Flowers are small and white, and grow on stalks about 1/3 as tall as the leaves.