1, Farfara Flos has antitussive, expectorant, antiasthmatic, respiratory excitement, contraction of smooth muscle, contraction of blood vessels, slowing heart rate and blocking calcium channels, and has carcinogenic activity. Animal experiments have proved that it has a strong antitussive effect, and the decoction can promote the increase of respiratory secretions and has obvious expectorant effect.

2. Farfara L. (scientific name: Tussilago Farfara L.) is a plant of Farfara genus in Compositae. Perennial herbs. The rhizome is underground and brown.

3. In early spring, pull out several flower beds from the flowers and leaves. The flower beds are 5- 10 cm high, densely covered with white hairs, and have scaly alternate bracts, which are lavender. The flower head is solitary, with a diameter of 2.5-3 cm, initially erect and drooping after flowering. Achene cylindrical, 3-4 mm long; The crest is white and the length is10-15 mm. Basal leaves are broad and heart-shaped, and petioles are long. The leaves are 3-12cm long and 4-14cm wide.