本品为榆科糙枝榆 Ulmus rubra Muhlenberg(又名 U.fulva Michaux.)的干燥内皮。植物学特征未粉碎糙枝榆为1～4mm 厚的板状,外表面为橙黄色并附带一些棕色外皮和木栓层,内表面为浅黄色并带有纹状韧皮线的痕迹。断面为带有5个一组的韧皮维管束凸出的纤维。粉末状糙枝榆呈浅橙黄色,有一种独特的、类似胡 This product is the dry endothelium of Ulmus rubra Muhlenberg (also known as U.fulva Michaux.). Botanical characteristics Uncrushed twigs were 1 to 4 mm thick plate-like, with an orange-yellow outer surface with some brown hulls and cork layers. The inside surface was light yellow with traces of striated bast lines. The section is a fiber with 5 groups of bast vascular bundles protruding. The powdery, rough twigs are pale orange-yellow and have a unique, similar-looking