Bidens micrantha is a species of flowering plant in the aster family known by the common name grassland beggarticks.

It is endemic to the Hawaiian Islands, where it and other Bidens species are known as kōʻokoʻolau.

kalealaha is rare and federally listed as an endangered species.

[2][4] This is a shrub forming clumps of herbage up to several feet tall.

It bears plentiful flower heads with yellow ray florets.