Poison oak Toxicodendron diversilobum A

plant that is poisonous to touch, closely related to poison ivy. The leaves of poison oak occur in groups of three and are very similar to oak leaves, from which the plant gets its name. The underside of the leaves is much lighter green because of the thousands of tiny fine hairs that cover them. Berries may be green or white, although not all plants bear fruit. Poison oak usually grows as a low shrub on the west coast, from Mexico to British Columbia. (See poison ivy for details on treatment and prevention.)

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