北豆根为防己科植物蝙蝠葛 Menispermumdauricum DC.的干燥根茎,具清热解毒,消肿止痛之功效。近来笔者发现有以寻骨风(马兜铃科植物绵毛马兜铃 Aristolochia mollissimaHance 的干燥根茎)混充北豆根入药,其功效为祛风湿、通经络、止痛,与北豆根不同,不可作北豆根药用。本文对寻骨风的性状和组织显微特征进行了观察鉴别,现介绍如下。 North bean root is a dried rhizome of Menispermum dauricum DC, which is a kind of antibacterial plant. It has the effects of detoxification, swelling, and pain relief. Recently, the authors found that the use of Bingfengfeng (Aristolochia mollissimaHance dried rhizomes of Aristolochiaceae plant Aristolochia mollissimaHance) mixed with North bean root medicine, the effect of rheumatism, meridians, pain, and the northern bean is not the same, can not be North bean root medicinal. In this paper, the identification and the microscopic characteristics of bone-setting wind were observed and identified.