the little water lily, in botany, a genus of the dioecia decandra clas. The spatha of the male consists of two leaves, the calix of three segments, and the corolla of three petals. The calix of the female consists of three segments, and the corolla of three petals; it has six styli; and the capsule has six cells and many seeds. There is but one species, viz. the morsus ranæ, or frog bit, a native of Britain.