Poison Oak: What Every Hiker Needs to Know

Poison Oak / Courtesy of  Wyeast Blog

Poison Oak, Toxicodendron diversilobum, is one plant every hiker needs to know. The shiny oils on the leaf surface can cause severe allergic reactions on the skin, a blistering rash that can take anywhere from 12 hours to 10 days after exposure to show up. Even a brush with dead leafless branches of this plant can provoke severe …

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