根茎呈扁柱形，多弯曲，常有分枝。表面棕褐色或灰棕色，有环节，一面残留须根或圆点状根痕；叶痕三角形，交互排列，有的有鳞毛状叶基残留。断面纤维性，类白色或微红色，内皮层环明显，棕色油点散在。气芳香，味苦、微辛的药材是

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