Tussah silk is also called tussah silk, tussah silk, myrtle vine, rootless vine, tussah vine, tussah silk, wild fox silk, bean parasite, rattan, radish seed, etc. It is an annual parasitic herb with special physiological structure. There is no chloroplast in its cells, and it is attached to other plants by climbing vine-like structures. However, spikes stick out from the parts that contact the host, poke into the host and reach the phloem, absorb nutrients, and block the photosynthesis of its plants after flourishing. In addition, it will be stored as starch granules in tissues. The plant is very lush, with twisted stems, pale yellow, slender, about 1.5mm in diameter and many branches. Parasitic roots can be generated anywhere and extend into the host. Leaves sparse, scaly, triangular-ovate, flowers bisexual. Chinese traditional medicine Semen Cuscutae is the seed of dicotyledonous plants such as Semen Cuscutae, Semen Cuscutae australis, Caulis Lonicerae, etc. It has the effects of tonifying kidney and replenishing essence, nourishing liver and improving eyesight, preventing miscarriage and stopping diarrhea. Distributed in most parts of the country, especially in the north.