The plant family Anacardiaceae is a large, mostly tropical and subtropical group, containing about 650 different species, including cashews, pistachios and mangoes. However, five species of the genus Toxicodendron are of special interest in North America. All 48 of the contiguous United States host at least one species. Incidentally, Toxicodendron translates, quite literally, to ‘poison tree.’
■ POISON OAK (T. pubescens), also known as Atlantic poison ivy, grows well across the Southeastern United States, from Virginia to Florida, and west to Texas and Kansas. It forms an upright bush, reaching a height of 3 to 4 feet, and the leaves are deeply lobed, resembling white oak. It prefers dry, sandy conditions.
■ PACIFIC POISON OAK (T. diversilobum) grows along the Pacific Coast, from British Columbia into Mexico. It grows as…