Hibiscadelphus giffardianus viscosa"), and naio ("Myoporum sandwicense"). "H. giffardianus" is a small tree, reaching a height of and trunk diameter of . Hibiscadelphus giffardianus 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 . Associated plants include ōhia lehua ("Metrosideros polymorpha"), koa ("Acacia koa"), mānele ("Sapindus saponaria"),
Acacia sensu lato fragrant timber used for ornaments. "A. seyal" is thought to be the shittah-tree of the Bible, which supplied shittim-wood. According to the Book of Exodus, this was used in the construction of the Ark of the Covenant. "A. koa" from the Hawaiian Islands and "A. heterophylla" from Réunion are both excellent timber trees. Depending on abundance and regional culture, some "Acacia" species (e.g. "A. fumosa") are traditionally used locally as firewoods. It is also used to make homes for different animals. In Indonesia (mainly in Sumatra) and in Malaysia (mainly in Sabah), plantations of "A. mangium" are being established to