Turnera subulata is a species of flowering plant in the passionflower family known by the common names white buttercup, sulphur alder, politician's flower, dark-eyed turnera, and white alder. This plant is a perennial herb growing from a thick taproot and woody stem base. It reaches a maximum height around 80 cm (31 in). The leaves are roughly oval in shape with toothed edges. The undersides are glandular and coated in white hairs. The upper surfaces may be somewhat hairy, as well.