C. maculatum: annual or biennial; stem erect, branching, 3-5 feet high, smooth, glaucous, spotted, emitting a nauseous smell when bruised; leaves large, much divided into numerous small ovate or lanceolate deeply-cut segments; umbels terminal, of 10-15 rays; bracts short, lanceolate, those of the general involucre variable in number, those of the partial ones almost always three, turned to the outside of the umbel. - Hedges and borders of fields, etc. Fl. June, July.