Senecio sylvaticus is a species of flowering plant in the aster family.

[3] It is native to Eurasia, and it can be found in other places, including western and eastern sections of North America, as an introduced species and an occasional roadside weed.

It is an annual herb producing a single erect stem up to 80 centimeters tall from a taproot.

The toothed, deeply lobed leaves are up to 12 centimeters long and borne on petioles.

The inflorescence is a wide, spreading array of many flower heads, each lined with green- or black-tipped phyllaries.