Answer: hogweed

AnswerCrossword Clue
HOGWEEDCow parsnip
hogweeda coarse plant
hogweedany coarse weed with composite flower heads, esp. the cow parsnip
hogweedtall 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