Zizania latifolia, a perennial herb, has slightly round leaves, floats on the water, roots in the water, yellow flowers and oval capsules. The roots are edible, and the whole grass can be used for medicine, feed or fertilizer. Water chestnut leaf (water chestnut; Also refers to the name of coins cast in the Southern and Northern Dynasties and the Song Dynasty); Water chestnut belt (water chestnut is like a belt in water); Porphyra (Porphyra leaves); Water chestnut flower (water chestnut flower) Water chestnut in the Book of Songs ...