Senecio vulgaris ("senex," old man, from the resemblance of the white pappus to gray hair). - Family, Composite. Color, yellow. Leaves, narrow, pinnatifid, toothed, 2 to 6 inches long, the upper clasping the stem or sessile; lower on short, thick petioles. Several small heads of flowers in corymbs, without rays, with only central, tubular, yellow flowers.
Coarse, hairy herbs with hollow stems 6 to 15 inches high, branched. Bracts of the involucre tipped with black.
Common in cultivated or waste ground from Newfoundland to Virginia and westward to Michigan and Minnesota.