Rhizoma Dioscoreae Hypoglaucae. Part used: Rhizome. Known as Long Yam Root. Entering meridians: urinary bladder, liver and stomach. Bi Xie separates the pure from the turbid, expels wind-dampness, relaxes the sinews, unblocks the Luo channels and clears damp-heat from the skin. All Phoenix Medical dry authentic herbs and concentrated herbal granules are free of sulphur, herbicides and pesticides.