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giant hogweed

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noun
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.
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British Dictionary definitions for giant hogweed

giant hogweed

noun
an umbelliferous garden escape, Heracleum mantegazzianum, a tall species of cow parsley that grows up to 3 1/2 metres (10 ft) and whose irritant hairs and sap can cause a severe reaction if handledAlso called: cartwheel flower
Collins English Dictionary - Complete & Unabridged 2012 Digital Edition © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins Publishers 1998, 2000, 2003, 2005, 2006, 2007, 2009, 2012
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