2. Radix Curcumae is a drug for promoting blood circulation and removing blood stasis, and it is the root tuber of Radix Curcumae, Curcuma longa, Guangxi zedoary, Curcuma zedoary and Radix Curcumae. Yujin is a perennial herb, which grows on sunny slopes or fields with fertile and moist soil and is cultivated in many departments.