This section is from the book "British Wild Flowers In The Four Seasons", by Thomas Moore. Also available from Amazon: British Wild Flowers.
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.
 
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