[Morphological study on rhizome of Dioscorea gracillima being forgery of Rhizoma Dioscoreae Hypoglaucae]

Rhizome of Dioscorea gracillima is the main forgery of Rhizoma Dioscoreae Hypoglaucae. The paper reports the results of study on chracteristics of its apperance, micriscopical characteristics of cross section and powder, characteristics of inner wall of trachea by scanning electron microscope. Rhizome of Dioscorea gracillima can be distinguished from Rhizoma Dioscoreae Hypoglaucae by above results of study.