Quick Answer
Short Answer: Poison oak and poison ivy can be difficult to distinguish, but poison oak typically has lobed or deeply toothed leaves, while poison ivy has compound leaves with three leaflets. Both plants have urushiol oil, which causes allergic reactions in most people.
Identifying Poison Oak and Poison Ivy
Poison oak (Toxicodendron diversilobum) and poison ivy (Toxicodendron radicans) are two of the most common plants that cause skin irritation in the United States. The key to distinguishing between the two is to examine the shape and arrangement of their leaves. Poison oak typically has lobed or deeply toothed leaves that resemble oak leaves, with 3-5 lobes. These lobes can be rounded or pointed, and may be shallow or deep.
Identifying Poison Ivy
Poison ivy has compound leaves with three leaflets, which are usually arranged in an alternate pattern. Each leaflet is typically 1-4 inches long and has a pointed tip. The edges of the leaflets are smooth or have a few small teeth. Poison ivy can grow as a vine, shrub, or groundcover, and can be found in a wide range of habitats, including forests, fields, and along roadsides.
Tips for Avoidance and Treatment
To avoid contact with poison oak and poison ivy, wear protective clothing, including long sleeves and pants, when hiking or working outdoors in areas where these plants are common. Wash your clothes and gear thoroughly after exposure, and wash your skin with soap and water as soon as possible. If you experience symptoms, such as redness, itching, or blistering, apply calamine lotion or hydrocortisone cream to relieve discomfort. In severe cases, seek medical attention to receive further treatment, such as antihistamines or steroids.
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