ACHYRANTHES BIDENTATA. Dried roots of Cyathula Officinalis Kuan (amaranthaceae) . It has the functions of promoting blood circulation and removing blood stasis, expelling wind and removing dampness. Main treatment blood stasis, dystocia, not under the clothes, postpartum blood stasis abdominal pain, hot Lin, Shi Lin, dysmenorrhea, rheumatism waist and knee pain, injury.