Hibiscadelphus giffardianus (Kilauea hau kuahiwi)[4] is a species of flowering plant in the mallow family Malvaceae that is endemic to the Big Island of Hawaii.

H. giffardianus is a small tree, reaching a height of 7 m (23 ft) and trunk diameter of 30 cm (12 in).

[5] It is sometimes believed to be extinct in the wild, with any remaining plants being threatened by habitat loss.

Cultivated plants exist in Hawaii Volcanoes National Park, and certain captive-grown individuals have been replanted at the original site.

It inhabits mixed mesic forests on the slopes of Mauna Loa at elevations of 1,200–1,310 m (3,940–4,300 ft).