Coltsfoot flower, the name of Chinese medicine. It is the dried flower bud of Tussilago farfara L., a plant in the Asteraceae family. Distributed in Northeast, North, East, Northwest and Hubei, Hunan, Jiangxi, Guizhou, Yunnan, Tibet and other places. It has the effects of moistening the lungs and lowering the qi, relieving cough and reducing phlegm. It is often used for chronic cough, wheezing and coughing up phlegm, and labored cough and hemoptysis.