From WKYC:

"The Giant Hogweed characterized by its white flower and purple/green stem has a dangerous sap that removes the skin's ability to filter ultra violet rays from the sun.
If you're exposed to the sap, found in the stem, it can cause a second degree burn if you're in sunlight and you don't wash it off in time. "

To read the rest of this story, please visit WKYC 
 

To learn more about the Giant Hogweed, please visit Ohio State University