一、巴戟天与羊角藤、番巴戟巴戟天外皮灰黄色微带紫,皮部横向断离如“鸡肠”。切面皮厚,灰紫色;木心小,灰棕色;皮部约为木部2倍。味甘甜微涩。羊角藤外皮暗灰黄色,皮部有断裂。切面皮薄木大,木部约为皮部2倍。去木心饮片,内表面粗糙,淡棕色,呈槽状或卷筒状。味微甜。香巴戟外皮棕红色,无断裂,切面粉性,皮部棕黄色,木部类白色。气微香带特异臭,味苦,嚼之发粘。二、大黄与土大黄大黄外表面、切面均呈黄棕色或红棕色,体较重,根茎可见星点环列或散在。气 First, the Morinda officinalis and C. edulis, Faba and Morinda are yellow, purple and yellow, and the skin is horizontally separated from the gut. Thick cut surface, grayish purple; wooden heart is small, gray-brown; leather is about 2 times the wood. Sweet and slightly astringent. The horn vines are dark grayish yellow and their skin is broken. The cut surface is thin and the wood is about twice as large as the skin. Go to the heart of wood pieces, rough surface, light brown, grooved or roll shape. Sweet taste. Champagne red brown skin, no break, cut floury, brown brown leather, wood class white. Gas slightly fragrant smelly, bitter, chewing sticky. Second, rhubarb and rhubarb rhubarb outer surface, cut surface are yellow brown or reddish brown, the body is heavier, the root can be seen star clusters or scattered. gas