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Why is a plant called a needle thief?
Bidens bipinnata, right?

Its seeds are easy to stick to people's clothes and animal's fur when they are mature.

Bidens bipinnata, a plant of Panicum in Compositae, was first seen in Notes on Materia Medica. There are different names, such as Buxus macrophylla (Herbal Supplement), Baki Needle, Bidens pilosa, Buxus macrophylla, Buxus macrophylla, Kuding Tea, Tribulus terrestris, Sticky Grass, Steel Fork Needle, Buxus macrophylla and so on. Bidens bipinnata is distributed in tropical and subtropical regions of Asia and America, and in eastern, central, southern and southwestern provinces of China. It grows in roadside wasteland, hillside and field at an altitude of 50-3 100 meters, and is a common folk herb in China. [ 1]? The flowering period is from August to September. The fruiting period is 9 ~ 1 1 month.