呈圆柱形，略弯曲；表面有较密并深陷的横皱纹、纵皱纹及裂纹，老根的横皱纹更密更深陷，略呈结节状；断面皮部棕黄色，抽去木心者中空，未去净者木部黄白色，皮部易与木部剥离；气微，味苦、微辛，皭之有刺喉感的药材是

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