Xu Changqing is a perennial herb with long and narrow opposite leaves, which are lanceolate and entire. Terminal panicle with yellow-green flowers. The fruit is bayonet-shaped, 6 cm long, and the top of the seed has white filamentous seed hair. Distributed in Liaoning, Hebei, Central South and East China. Born on the sunny grass on the hillside.

The whole grass and roots in Xu Changqing are used as medicine. Has analgesic, antitussive, diuretic, repercussive, blood circulation promoting and detoxicating effects, and can be used for treating stomachache, rheumatic pain, chronic tracheitis, dysentery, enteritis, etc. Why Xu Changqing? It is said that there was a doctor named Xu Changqing in ancient times. He often uses a grass to make powder to help people treat various plagues. People don't know the name of this medicine, so they call it Xu Changqing, and this kind of grass is correspondingly called Xu Changqing.