Bidens torta, the corkscrew beggarticks, or ko'oko'olau in Hawai'i, is a flowering plant species in the family Asteraceae. They are known for their role in the plant communities of the Hawaiian Islands. The species is part of a larger group of Hawaiian Bidens that have different variations across different environments. The Bidens tortas adapted to different ecological environments across the Hawaiian islands. Since the Hawaiian islands are geographically isolated, the evolution provides scientist with insight into plant diversification and speciation.

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