Renowned Chinese medicine, mostly born in white sandy soil. It can be planted in courtyards, riverbanks, ditch cliffs, roadsides and fields. White flowers in summer and fall, its fruit from green to yellow-brown, large as a goose egg, high sugar content, so it is called piper betel, can be used in medicine, have a moistening lung cough, clearing heat and phlegm efficacy, the main treatment for cough and phlegm, chest paralysis and rib pain, stool dryness and other diseases. Its tuberous roots are straight underground, and the old ones are seven or eight feet long. The diameter of five centimeters long. The bottom of the large up to more than ten centimeters. General fall and winter dig out, sliced into medicine, its section white as frost, said smallpox powder. Produced in Gaotang, high rate of powder, so it is high pollen. Functions to clear heat and promote the production of fluids, the main treatment of fever, can also be clear to drink. Recently, there are fresh roots made of injections, which can be used to induce labor.