Poison ivy belongs to a diverse botanical family that also includes the cashew and which tropical fruit?

The three plants are part of the Anacardiaceae family, sometimes called the cashew family. Other members include poison oak, sumac, Peruvian pepper, pistachios, and cashews. They all contain urushiol, an oil that causes a rash eruption in some sensitive people. Unfortunately, the oil isn't limited to one portion of the plant: it's found in all parts, including the leaves, stems, and roots.

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