An oil called urushiol causes skin irritation when you brush up against this 3-leafed plant, Rhus radicans
| Henriette's Herbal Homepage [PAR] POISON IVY (Toxicodendron radicans = Rhus radicans = Rhus toxicodendron) ... 
LEAVES ALTERNATE (= 1 leaf per node), TRIFOLIATE (= 3 leaflets), with ...