Willow is called black coral, so it is named because of its dendritic shape, slender branches, flexible texture and similar appearance to willow trees on land. Although it looks like a tree, through marine scientific research, it is a marine animal, belonging to coelenterate and a kind of coral family. Willow, the name of Chinese medicine, is a branch of Japanese black-horned coral, belonging to black-horned coral family. Distributed in Guangdong Dapeng Bay, Hainan Yalong Bay, Sanya, Xihua and other sea areas. Has hemostatic, analgesic and sedative effects. Commonly used for hemorrhoids, bleeding, abdominal pain, convulsions. Grouping of medicinal parts. taste