is an annual herb, whose stalk grows up to 200 cm and grows in stagnant or slowly flowing waters. This plant is strongly photophilous – it is partially submerged and partially floating. Its top leaves grow in dense top rosettes, petals are small and white. Water chestnut's fruits are horned nuts. The plant ranks among the critically endangered species of our flora and is protected by the law. Water chestnut is occasionally grown as an ornamental plant in water reservoirs. In the Orient, its fruits are used for flour production and also utilised as curative herb.