The Chinese medicinal material yam tablet is the dry rhizome of Dioscorea diosciaceae, which is a perennial entwined herb. The flesh of yam tubers is thick and slightly cylindrical. It grows vertically, up to 1 meter long and 2 to 7 cm in diameter. The outer skin of yam is gray-brown with fibrous roots. Its stems are slender, vine-like, usually purplish, ribbed, smooth and glabrous.
2022-08-05
