Most dangerous plant stinger

Commonly known as gympie-gympie, the plant Dendrocnide moroides is widely considered to possess the most dangerous plant stingers by touch, even causing death in animals such as dogs and horses and in rare cases, also humans. Its native habitat is rainforest regions of Australia and Malaysia, as well as some islands in the region such as Indonesia's Lesser Sunda Islands and Vanuatu. Another member of the nettle family (Urticaceae) with extremely hazardous and sometimes lethal stingers is the native New Zealand tree nettle (Urtica ferox).

Gympie-gympie grows up to 3 m (10 ft) in height with leaves covered in trichomes (plant hairs) that contain a cocktail of toxins, including formic acid, histamine, acetylcholine and nerve toxins known as gympietides. After contact, burning, pain, swelling (oedema) and urticaria can occur but symptoms such as pain, itching and burning can persist for months. The New Zealand tree nettle is said to cause similar symptoms, also with anecdotal reports of death occurring in humans and other vertebrates.