, also known as senecio jacobaea, is native to Europe and Asia, and has been established in US the Pacific Northwest and north California. Identifying features include the relatively wide, lobed leaves, and the black tips of the phyllaries. Plants produce one or several (up to ten) stout stems, which are light green, sometimes with purple tints, and either hairless or only lightly hairy. Leaves grow all along the stems; they are pinnately divided up to three times, into obovate lobes, which have a few teeth on the outermost margins.
Flowerheads usually have 13 narrow, well-separated yellow rays, up to half an inch in length, and 60 to 70 yellow to orange disc florets. The main phyllaries are light green, one per ray floret; at the base of the involucre are a few secondary phyllaries, much shorter, also black or brown-tipped. The inflorescence is a flat-topped cluster of up to 60 flowerheads.