3Gympie-Gympie (Dendrocnide moroides)

Known as the “Stinging Tree,” the Gympie-Gympie is native to Australia. It may look like an ordinary bush, but its leaves are covered in tiny, hair-like needles that deliver an intense and long-lasting sting.
The pain can last for weeks or even months. In extreme cases, the sting can cause severe allergic reactions. Even dead leaves remain dangerous, making this tree one to avoid.