Sanliang, Chinese name. It is the dried tuber of Sparganium nigrum. Ham. Dig in winter until the next spring, wash, peel and dry. Distributed in northeast China, Yellow River, river basin, middle and lower reaches of Yangtze River and Tibet. Has the effects of promoting blood circulation, promoting digestion and relieving pain. Used for abdominal mass, dysmenorrhea, blood stasis amenorrhea, chest pain, heartache, indigestion pain.