Oahu beggarticks

Its natural habitat are montane tropical moist forests, tropical moist shrubland, and rocky areas. It is threatened by habitat loss due to the spread of invasive weeds and overgrazing.

Bidens populifolia is endemic to the Koolau mountains, Oahu. This species is known from 4–5 subpopulations within a restricted area of occupancy. Geographic Range - Range Description: Bidens populifolia is endemic to the Koolau mountains, Oahu. Known from four to five subpopulations with a total population size of over five thousand individuals. B. populifolia has a restricted area of occupancy. More