On first sight, I thougth this plant was (common) groundsel, Senecio vulgaris, but this one has has petaled flowers, although the petals are curled and almost invisible.
Senecio sylvaticus is a species of flowering plant in the aster family known by the common name woodland ragwort and heath groundsel. 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 grows best in cool, wet areas. It is an annual herb producing a single erect stem up to 80 centimeters tall from a...
