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a North American genus in the plant family Asteraceae (Compositae); plants contain a toxic alcohol, tremetol, and ingestion of the plant over a period causes a stiff gait, severe tremor and final collapse and death. Includes H. fruticosus, H. hartwegii, H. heterophyllus, H. tenuisectus. Called also Isocoma wrightii, Bigelowia rusbeyi, jimmy weed, rayless goldenrod, burrow weed. See also eupatoriumrugosum.