Yizhiyu;Ulmi Propinquae Cortex Sources:The drug is the root-bark and bark of Ulmus propinqua Koidz.var.suberosa Miyabe(family Ulmaceae),growing in the edge of forest,roadside,sunny land and distributed in the northeast and the north of China. Actions and Indications:It is used to clear away heat and toxic materials,remove blood stasis,for the treatment of bone tuberculosis.