Polygala is produced in Northeast, North, Northwest and Central China and Sichuan. It is a perennial herb with a stout taproot and a succulent phloem. Yuanzhi has the functions of calming the nerves, removing phlegm, and reducing swelling. It is used for insomnia, forgetfulness, palpitation, trance, unpleasant expectoration, sore, swollen poison, breast swelling and pain caused by heart and kidney failure.