Poison ivy

Poison Ivy is a plant that mentioned in Diary of a Wimpy Kid: Old School.

When Mr. Jefferson sets up a fire and told the rest of Greg's cabinnates to get some kindling to a fire but nobody knew what kindling was, so they brought back everything as they thought might burn. His son Rowley came back with what looked like a bunch of weeds and tossed them onto fire, but that totally smothered it. It turns out the weeds Rowley put on the fire was actually poison ivy, the next morning he woke up covered with spots. His father Mr. Jefferson woke up too and he discovered that he has trouble breathing as he inhaled the fumes and gotten it in his lungs. The nurse called their wife Mrs. Jefferson to come pick them both up and left.