Hibiscadelphus giffardianus (Kilauea hau kuahiwi) is a species of flowering plant in the mallow family, Malvaceae, that is endemic to the Big Island of Hawaii. It is believed to be extinct in the wild; any remaining plants are threatened by habitat loss. Cultivated plants exist in Hawaii Volcanoes National Park. It inhabits mixed mesic forests on the slopes of Mauna Loa at elevations of 1,200–1,310 m (3,940–4,300 ft). Associated plants include ʻōhiʻa lehua (Metrosideros polymorpha), koa (Acacia koa), mānele (Sapindus saponaria), hoio (Diplazium sandwicianum), pilo (Coprosma spp.), māmaki (Pipturus albidus), kōpiko (Psychotria spp.), olopua (Nestegis sandwicensis), alani (Melicope spp.), ʻaʻaliʻi (Dodonaea viscosa), and naio (Myoporum sandwicense). H. giffardianus is a small tree, reaching a height of 7 m (23 ft) and trunk diameter of 30 cm (12 in).
- World Conservation Monitoring Centre 1998. Hibiscadelphus giffardianus. 2010 IUCN Red List of Threatened Species. Archived 2014-06-27 at the Wayback Machine. Downloaded on 15 April 2011.
- "Taxon: Hibiscadelphus giffardianus Rock". Germplasm Resources Information Network. United States Department of Agriculture. 1995-01-26. Retrieved 2010-11-02.
- "Hibiscadelphus giffardianus". Natural Resources Conservation Service PLANTS Database. USDA. Retrieved 14 May 2015.
- "Hibiscadelphus giffardianus". CPC National Collection Plant Profiles. Center for Plant Conservation. Archived from the original on 2010-11-21. Retrieved 2009-11-13.
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