ragwort

Any of various plants in the composite family, chiefly of the genera Senecio and Packera, having yellow flower heads. S. jacobaea, a European species poisonous to livestock, is widely naturalized in North America and elsewhere.

The name of several plants of the genus Senecio; primarily, S. Jacobæa of Europe and northern Asia.

A name given to several species of the composite genus Senecio.

Any of a number of wild flowering plants with yellow flowers in the family Asteraceae, mostly belonging to Senecio and related genera.

American ragwort with yellow flowers

widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity