(Hydrocharis), a genus of water plant of the Hydrocharitaceae family. Small, delicate, freely floating dioecious plants with unisexual white flowers. The leaves are gathered together in a rosette and have rather long leafstalks; on these leafstalks are rounded, broad heart-shaped disks that float on the surface of the water. It reproduces mainly by horizontal vegetative shoots. It spends the winter in the form of individual buds that drift to the bottom in the autumn and float to the surface in the spring. Two species of frogbit are known: common frogbit (H. Morsus-ranae), which is wide-spread in stagnant and slowly flowing waters in Europe and Asia and which also breeds in aquariums, and dubious or Asiatic frogbit (H. dubia, formerly//. Asiatica), which grows in the east and south of Asia.