Original in tropical Asia, Indonesia, Malaysia to southern China and other places, is a perennial herb, dry root, was cylindrical, oval or spindle, the shape of ginger and a small fork, 2.5 to 5.5 cm long , 10 to 20 mm in diameter. Dark yellow-brown surface, often with yellow powder, the more shrinkage, and a clear ring of fibrous roots and residual festival marks. Sound quality and heavy, difficult to break, the cross-section brown or yellow, or horn-shaped wax-like luster, near the external one yellow ring pattern, often in the central yellow dot NF.

 Therapeutic efficacy: a litter bitter, severe cold , non-toxic. can be used for   the pain cure. Close rule over pain swelling of the liver, shoulder or  blood stasis by the closure of women , post-natal blood to stop abdominal pain, or head injury, swollen carbuncle.