Senecio
There are about fifty poisonous species of this member of the Sunflower family, growing as a weed in pastures and meadows everywhere. Sometimes ragwort is used as a tall border plant in gardens. Stalked basal leaves are up to eight inches long, cut into lyre-shaped lobes. Stem leaves are broadly lance-shaped, up to six inches long, and cut into two or three lobes. The poisonous parts are the stems and leaves, which may cause liver damage when eaten in quantity.
The USDA Poisonous Plant Research Laboratory site has more information on groundsel.
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