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Poison ivy and poison oak come in a variety of sizes and shapes which leads to confusion in identification. The stems may be trailing or climbing vines or erect growing shrubs depending upon the environment where the plants are growing. The leaf shapes range from smooth to toothed or lobed. Most leaves have surfaces which are shiny and without hairs. Some experts divide the various types of poison ivy and oak into 7 different species, others into 3 or 4 species, and some experts regard it all as one species with many different
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