This rather beautiful shrub can be the source of great misery for those who are sensitive to it. The rash and itching are severe...extremely, profoundly severe. If Scott N. finds out you are sensitive to Poison Sumac, he will take you to places where it grows by the hundreds of thousands. And after you limbo and crawl under it for 3 or 4 miles, he'll casually let you know "they have rattlesnakes here."
Poison Sumac - Rhus vernix