sumac

 Health advice on vinegar and poison oak | Poison ivy and vinegar
Poison oak and vinegar: how do you apply warm vinegar to poison oak,sumac or ivy, and what does it actually do for the infestation?[...]

 Symptoms, Causes and Remedies for Skin Irritation
Like most of the other plants and shrubs that irritate the skin on contact (of which the most well known is probably poison ivy) poison sumac contains an oily substance known as urushiol. It is this substance that causes the combination of symptoms that are known as urushiol induced contact[...]

 Plant Allergies Treatment | Poison Ivy Treatment
Poison Ivy & Plant Allergies TreatmentMember of the Anacardiaceae family, poison ivy (Toxicodendron radicans) is a sub shrub with a very wide distribution. Found commonly in wooded areas, the plant is found in abundance in North America. It is also found in exposed rocky areas, open fields and disturbed areas[...]