Water chestnut (pinyin: bí qi) English name: water chestnut (scientific name: Eleocharis dulcis). Water chestnut, also known as horseshoe, magnetic melon (common name), water chestnut, peony, black taro, bodhisattva, pear, pitching fruit and water chestnut, is a kind of water chestnut in Cyperaceae. Eleocharis tuberosa of Cyperaceae is a shallow perennial herb with bulbs as vegetables. In ancient times, it was called fumi (fumi), commonly known as horseshoe, also known as chestnut, which was named after its shape like horseshoe and chestnut. Calling it a horseshoe only refers to its appearance; It is like a chestnut, not only in shape, but also in taste, composition and function. Because it bears fruit in the mud, it is called a chestnut.