Guioa is a genus of about 78 rainforest tree species known to science, which constitute part of the plant family Sapindaceae. They have a wide distribution, ranging from throughout Malesia, in Burma, Cambodia, Vietnam, Thailand, Malay Peninsula, Borneo, Sumatra, Philippines, Java, Flores, Timor, Sulawesi, Moluccas, New Guinea, further southwards through the east coast of Queensland and New South Wales, Australia and further eastwards to the Pacific Islands, including Tonga, New Caledonia, Fiji and Samoa. At global, national and regional government scales, many Guioa species have been threatened with extinction, as officially recognised by the International Union for Conservation of Nature (IUCN) and by continental, national and local governments. Twenty five species, or more, have official IUCN global conservation statuses of either "critically endangered", "endangered" or "vulnerable" (to global extinction). The Australian species are known to the logging industry as cedars, though they have no direct relationship with true cedars or the Australian members of the Meliaceae which are known as cedars. Selected species This incomplete listing was sourced from Peter C. van Welzen's 1989 revision of the genus and earlier scientific papers, the Australian Plant Name Index and Australian Plant Census, the Census of Vascular Plants of Papua New Guinea, Flora Malesiana, the Checklist of the vascular indigenous Flora of New Caledonia, Flora Vitiensis (Fiji), and the Flora of Tonga. Guioa acuminata – Philippines, New Guinea – Endangered Guioa acutifolia , Glossy tamarind – New Guinea, Moluccas, Qld, Australia Guioa amabilis – Vogelkop Peninsula, New Guinea Guioa aryterifolia – New Guinea Guioa asquamosa – Flores, Timor – Vulnerable Guioa bicolor – Philippines – Vulnerable Guioa bijuga – Thailand, Malay Peninsula, Borneo, Sumatra, Philippines Guioa capillacea – Fiji endemic Guioa chrysea – Fiji endemic Guioa comesperma – New Guinea incl. surrounding islands, Qld, Australia Guioa contracta – New Guinea Guioa coriacea – Lord Howe Island endemic Guioa crenata – New Caledonia endemic Guioa crenulata – New Caledonia endemic Guioa diplopetala – Burma, Thailand, Cambodia, Vietnam, Malay Peninsula, Borneo, Sumatra, Sulawesi, Java Guioa discolor – Philippines – Endangered Guioa elliptica – New Guinea Guioa eriantha – New Guinea Guioa fusca – New Caledonia endemic Guioa glauca – New Caledonia endemic var. glauca – New Caledonia endemic [[Guioa glauca var. vulgaris|var. vulgaris]] – New Caledonia endemic Guioa gracilis – New Caledonia endemic Guioa grandifoliola – New Guinea – Critically endangered Guioa hirsuta – Sulawesi Guioa hospita – New Guinea – Critically endangered Guioa