Objective: To make microscopic identification research of three Echinacea-species roots recorded in the United States Pharmacopeia.
Method: The root transverse section and powder of E. angustifolia, E. pallida, and E. purpurea were observed. The main microscopic features were photographed.
Result: The main microscopic features of transverse section and powder in three Echinacea-species roots are basically similar, except for some diagnostic differences. The results provide reliable reference for the authentication of raw materials of western herbal studies.