Hibiscadelphus woodii, or Wood's hau kuahiwi,[4] is a species of flowering plant in the family Malvaceae endemic to Kauai, Hawaii.

Hibiscadelphus woodii inhabits basalt scree and cliff walls in ʻōhiʻa lehua (Metrosideros polymorpha) dominated mixed mesic forests at an elevation of 915 m (3,002 ft) in the Kalalau Valley.

Associated plants include koʻokoʻolau (Bidens sandvicensis), ʻāhinahina (Artemisia australis), alani (Melicope pallida), naʻenaʻe (Dubautia spp.

Pollen was found to be inviable, no fruit set was ever observed and all attempts at propagation, including by cross-pollination with H. distans, failed.

[6] It was later assessed as extinct by the International Union for Conservation of Nature in 2016,[1] but three individuals were rediscovered in 2019 by the National Tropical Botanical Garden.