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Poison Oak <br /> r • <br /> M <br /> The Poison Oak of the southeastern United States has its leaves divided into three leaflets; the <br /> leaflets are densely haired and generally have three to seven distinct lobes. The white, berry-like <br /> fruit are also somewhat hairy. Both species contain poisonous substances that are believed to be <br /> identical or closely related to that found in poison ivy. <br />