Hibiscus Arnottianus

H. Arnottianus is commonly known as the Hawaiian Hibiscus. Hibiscus Arnottianus (koki‘o) is an endemic species of hibiscus with white flowers. Three subspecies are recognized: H. arnottianus found in the Wai‘anae mountain of western O‘ahu; H. a. immaculatus which is very rare (listed as endangered) on Moloka‘i; and H. a. punaluuensis from the Ko‘olau mountain on O‘ahu. Perhaps only a dozen plants of H. a. immaculatus exist in nature. This species is closely related to H. waimeae. Sometimes planted as an ornamental.