hydrophily
Vallisneria is a hydrophytic, submerged plant in which male and female flowers borne on separate plants. The female flower reaches on the water surface by the long stalk while the male flower remains under water. When both flowers mature, male or staminate flowers release pollen grains in the water which comes on the water surface and along the water current, reach to female flowers and pollination occurs.
Hydrophily is the pollination of a flower through the agency of water. It is a rare type of pollination employed by hydrophytes (aquatic plants), and can occur in one of two ways. Either the pollen grains themselves are carried on or under the surface of the water, or the male flowers break off and float along until they come into contact with a female flower.
