Dendrocnide moroides, also known as the Gympie Gympie, moonlighter, or stinger, is a large shrub native to rainforest areas in northeastern Australia, the Moluccas and Indonesia. It is best known for stinging hairs which cover the whole plant and deliver a potent neurotoxin when touched. It is the most virulent species of stinging tree.
D. moroides usually grows as a single-stemmed plant reaching 1–2 metres in height. It has large, heart-shaped leaves that are about 12–22 cm long and 11–18 cm wide, with finely toothed margins.
Ecology
The species is unique in the genus in having bisexual inflorescences in which the few male flowers are surrounded by female flowers. The flowers are small, and once pollinated the stalk swells to form the fruit. Fruits are juicy and mulberry-like and are bright pink to purple. Each fruit contains a single seed which is on the outside of the fruit.
The species is an early coloniser in rainforest gaps; seeds germinate in full sunlight after soil disturbance. Although relatively common in Queensland, the species is uncommon in its southern-most range, and is listed as an endangered species in New South Wales.
The giant stinging tree and the shining-leaved stinging tree are other large nettles occurring in Australia.
Toxicity
Contact with the leaves or twigs causes the hollow silica-tipped hairs to penetrate the skin. The sting causes a painful stinging sensation which can last for days or even months, and the injured area becomes covered with small red spots joining together to form a red, swollen mass. The sting is known to be potent enough to kill humans, and it can also kill dogs and horses. However the sting does not stop several small marsupial species, including the Red-legged Pademelon, insects and birds from eating the leaves. Some research has been done on the composition of the neurotoxin; however, the exact composition and method of action for the toxin remains unknown.
source:http://en.wikipedia.org/wiki/Dendrocnide_moroides
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