Houttuynia cordata is the dry water part of the perennial herb of Saururus chinensis family. Produced in the provinces south of my country’s Yangtze River Basin. See “Famous Doctors”. Tang Susong said: “It grows wetland, and the shade of valleys can also sprawl. The leaves are like buckwheat and the fat, the stems are purple and red. The people of Jiangzuo are good for raw food. Guanzhong is known as Potamogeton, the leaves are fishy, so it is commonly known as Houttuynia cordata .