Bidens cosmoides, commonly known as the cosmosflower beggarticks, is a species of flowering plant in the sunflower family. It is endemic to mixed mesic forests at elevations of 2,000–3,000 ft (610–910 m) on the island of Kauaʻi in Hawaii. This particular member of the genus Bidens is far larger than its relatives and is pollinated by birds. This plant is found only along the island's Mohihi Trail. It is threatened by habitat loss due to the spread of invasive weeds and brushfires. It has also been adversely affected by the disappearance of Hawaiian honeycreeper species that pollinate it.