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a tall plant, Heracleum mantegazzianum, of the parsley family, native to Russia and now naturalized in the U.S., having very large leaves and broad, white flower heads somewhat resembling Queen Anne’s lace: can cause an allergic rash when touched by susceptible persons.
an umbelliferous garden escape, Heracleum mantegazzianum, a tall species of cow parsley that grows up to 31/2 metres (10 ft) and whose irritant hairs and sap can cause a severe reaction if handled Also called cartwheel flower


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