Hibiscus arnottianus is a Hawaiian endemic plant with one endangered subspecies. It is native to the moist to wet forests of the mountains of Moloka'i and O'ahu.
The leaves are oval with a smooth upper surface and smooth or slightly toothed edges. The leaves are 4 to 6 inches long and often have red veins and stems. The single white flowers are pinwheel shaped, up to 4 inches across, and borne at the ends of the branches. Hibiscus arnottianus flowers usually have a weak fragrance. But, flowers have the most scent in the early morning when flowers open or in the early evening before they close.