It is an annual or perennial herbaceous plant growing to 1-1.2 m tall, with hairy stems and clear (not milky) sap. The leaves are spirally arranged; larger leaves at the base of the flowering stem are often pinnate, with a large oval terminal leaflet and one to four small side leaflets, while smaller leaves higher on the stem are simple oval; all leaves have a toothed margin. The flowers are yellow, produced in a capitulum 1-2 cm diameter, the capitula being numerous in loose clusters at the top of the stem
