Atlantic
posion oak and Western poison oak are closely related. Atlantic Poison (Toxicodendron
pubescens) oak grows up to 3 feet tall and can be found growing in forests, thickets,
and dry, sandy fields throughout the eastern U.S.
Western
poison oak (Toxicodendron diversilobum) is found on the Pacific Coast of North
America and is common from southern Canada to Baja California. Often found in
oak woodlands and Douglas fir forests, it can also be found in in damp, shady
areas near running water and out of direct sunlight.
All
parts of these plants contain urushiol, which causes severe dermatitis in some
individuals (approximately 85% of humans will develop allergic reactions). Common
symptoms are an irritating, itchy rash, often accompanied by blistering of the
skin.
Poison
oak is not an oak but was named so from its from its leaves' resemblance to white
oak . Poison oak and poison ivy are members of the
sumac family (Anacardiaceae). The plants do not contain a poison but rather a
potent allergen in oils of the plant.
Oils
can be easily transferred from one part of the body to another, from one person
to another, from a pet, or from clothing. A common saying helps one to remember
the general description of the irritant plants, "leaves of three, let it be".
See also poison ivy, poison
sumac,
skin rashes.
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