Bai Bu, Stemona (Stemonae Sessilifoliae) is a perennial herb with spindle-shaped root tubers.The plant usually grows in mountainous region, woods, or bamboo forest. The tubers are yellowish-white or khaki-colored in appearance, with irregular deep vertical sulcus or horizontal wrinkles sometimes.The root tubers of Stemona japonica are narrow at both ends, light grey in color, with irregular deep vertical sulcus or horizontal wrinkles. The root tubers of Stemona tuberosa Lour look like long spindle or elongated shapes, light yellowish-brown or grayish brown in color.