Pharmacognostic identification of Polygonum multiflorum Thunb.

Character recognition roots are cylindrical, often irregularly curved, with a diameter of 2-3cm. The surface is rough and brown, with obvious transverse cracks and longitudinal wrinkles, and some plugs are easy to peel off, exposing reddish-brown skin. Hard and not easy to break. The section is light brown, the xylem accounts for most of the roots, the annual rings are visible, and the aroma is pungent. Toxic. Root bark is irregular, slightly curly, thick 1-2mm, brown in appearance, with longitudinal wrinkles and a few transverse cracks; The inner surface is reddish brown, smooth and longitudinally textured. Crispy, slightly neat in section, fragrant and pungent in taste. Toxic. Roots and bark are better if they are dry and mud-free.