The Cynanchum is an annual herb in the family of Asteraceae. The fruit with involucre and the whole herb is used as medicine. The fruit contains auriculoside, auriculol, iso auriculol, auriculoside, linoleic acid. In addition, it also contains protein, alkaloids, vitamin C and resin. Taste bitter, pungent, sweet, warm, with a small poison. It has the functions of sweating and opening the orifices, dispersing wind and dampness, anti-inflammatory and analgesic.

Treatment: Cang Er Zi treats cold and headache, chronic sinusitis, paranasal sinusitis, malaria, rheumatoid arthritis. Cynodonopsis cure uterine bleeding, deep abscess, leprosy, skin eczema and other diseases. Distributed throughout the country, mostly wild. One year harvest.

Stronger adaptability, more drought-resistant, the soil requirements are not strict, but to loose fertile, well-drained sandy loam grow well. Propagation by seed.