Common Rash-Causing Plant
This page is the CodyCross answer for the clue below from Medieval Times, Group 224, Puzzle 3 (Constantine the Great).
Question is: Common Rash-Causing Plant
and the answer is: POISONIVY
Word Meaning:
POISON IVY — Any of three ivy-like species of Toxicodendron, known for their ability to cause an itching rash and blistering for most people, through urushiol, an oil that is a skin irritant.
Definitions from Wiktionary.