Coltsfoot (Tussilago farfara) is a medicinal plant in the family Asteraceae. This plant blooms in the early spring - pic taken on February, 24th. Diameter of the bloom maybe 1,5 cm.
It has been used medicinally as a cough suppressant. The name "tussilago" itself means "cough suppressant." The plant has been used since at least historical times to treat lung ailments such as asthma as well as various coughs by way of smoking. Crushed flowers supposedly cured skin conditions, and the plant has been consumed as a food item.