Common ragwort (Senecio jacobaea) belongs to the asteraceae (the Aster family). It is a biennial herb that is native to northern Eurasia, and has also been widely distributed as a weed elsewhere. This herb grows in dry, open places, and up to a height of 30-200 cm. The stems are erect, straight, have no or few hairs. The leaves are pinnately lobed and the end lobe is blunt. The yellow flower-heads bloom in dense, flat-topped clusters from June to November. Common ragwort contains many different alkaloids, making it poisonous to certain animals.