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References used to create this graphic:
Amato, Ivan. “Poison Ivy Could Get Worse.” C&EN (June 5, 2006).
Wolf, Lauren K. “Itching to Know More about Itch.” C&EN (July 4, 2011)
Holstege, Samuel. “Giant Hogweed.” Blue Ridge Poison Center (July 2018).
US Food and Drug Administration. “Outsmarting Poison Ivy and Other Poisonous Plants.” Accessed July 10, 2020.
A collaboration between C&EN and Andy Brunning, author of the popular graphics blog Compound Interest