This is the root of Wei Ling Xian, which is used in medicine, and has the effect of activating blood, dispelling wind, and transforming stalks. Willow Fairy (scientific name), alias: Iron Foot Willow Fairy, Iron Horn Willow Fairy, Iron Foot Spirit Fairy, Iron Foot Clematis, Iron Rake Head and so on. Is the buttercup family, Clematis genus perennial woody vine. Stem, branchlets nearly glabrous or sparsely pubescent. One pinnately compound leaves; leaflets papery, ovate to ovate-lanceolate, or linear-lanceolate, ovate-orbicular, apical acute to acuminate, base rounded, broadly cuneate to shallowly cordate, paniculate cymes, many-flowered, sepals white, oblong or oblong-obovate, achenes flattened, ovate to broadly ellipsoidal, flowering from June to September, fruiting from August to November. The roots and stems of this species are used as medicine with the efficacy of dispelling wind-dampness, opening the meridians, and eliminating bone stems. In modern clinical practice its new uses are constantly being discovered, such as the treatment of gallstones, heel bone spurs, heel pain, esophageal cancer and so on. However, it is important to note that it should not be taken by pregnant women or those who are deficient in qi and blood.