giant hogweed

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. Unabridged
Based on the Random House Dictionary, © Random House, Inc. 2014.
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World English Dictionary
giant hogweed
Also called: cartwheel flower an umbelliferous garden escape, Heracleum mantegazzianum, a tall species of cow parsley that grows up to 3½ metres (10 ft) and whose irritant hairs and sap can cause a severe reaction if handled

Collins English Dictionary - Complete & Unabridged 10th Edition
2009 © William Collins Sons & Co. Ltd. 1979, 1986 © HarperCollins
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Example sentences
Unable to identify one plant growing on his doorstep, he leaves it alone and
  lets it grow: it turns out to be a giant hogweed.
In which they innocently planted the giant hogweed throughout the land.
Serial killers and giant hogweed would seem to have little in common.
Giant hogweed makes an impressive appearance because of its height, and the
  size of the leaves and flower clusters.
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