Bright yellow flower heads in dense corymb. Numerous ray florets. Deeply-pinnate basal and stem leaves with toothed segments. Leafy stems. Hairless or slightly woolly plant. Fresh plant contains poisonous alkaloids - avoided by grazing animals. Important food source for caterpillars of Cinnabar Moth (below). Height 30-140cm.
Very common, grassland, wasteland, roadsides, dunes.
Similar: Marsh Ragwort, S. aquaticus