Hedyotis Diffusa is a kind of herb used in traditional Chinese medicine. It refers to a plant of the genus Saxifraga in Rubiaceae, which mainly grows in Japan and the southern part of China. It is being called this name because it looks like snake tongue of Bai Hua She. As one of the annual plants, it is 15 to 50cm high, thin long root, branching, and with white flowers. Most of them grow in rocky mountainous areas of 1,800 meters above sea level.