''Tussilago farfara'', commonly known as coltsfoot, is a plant in the family Asteraceae that has traditionally had medicinal uses. However, the discovery of toxic pyrrolizidine alkaloids in the plant has resulted in liver health concerns. ''T. farfara'' is the only species in the genus ''Tussilago''. The name "tussilago" is derived from the Latin ''tussis'', meaning cough, and ''ago'', meaning to cast or to act on.