Alias stinging grass, biting grass, scorpion grass, angiosperms, Urticaceae, it is a perennial herb, mainly born in mountain forests or roadside. The stem is 60- 100 cm high, and the leaves are opposite, monoecious or dioecious. The stinging hairs on its stems and leaves are toxic (allergic reaction), and once people and animals such as pigs, sheep, cows, horses, birds and rats meet them, they will be as painful as bee stings, and its toxicity will cause irritating dermatitis immediately after skin contact, such as itching, severe burns and redness.

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