# Guioa

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 Radlk. – Philippines, New Guinea – Endangered
* Guioa acutifolia Radlk., Glossy tamarind – New Guinea, Moluccas, Qld, Australia
* Guioa amabilis Kanehira & Hatsusima – Vogelkop Peninsula, New Guinea
* Guioa aryterifolia Radlk. – New Guinea
* Guioa asquamosa Welzen – Flores, Timor – Vulnerable
* Guioa bicolor Merr. – Philippines – Vulnerable
* Guioa bijuga (Hiern) Radlk. – Thailand, Malay Peninsula, Borneo, Sumatra, Philippines
* Guioa capillacea A.C.Sm – Fiji endemic
* Guioa chrysea A.C.Sm – Fiji endemic
* Guioa comesperma Radlk. – New Guinea incl. surrounding islands, Qld, Australia
* Guioa contracta Radlk. – New Guinea
* Guioa coriacea (Radlk.) Radlk. – Lord Howe Island endemic
* Guioa crenata Radlk. – New Caledonia endemic
* Guioa crenulata Radlk. – New Caledonia endemic
* Guioa diplopetala (Hassk.) Radlk. – Burma, Thailand, Cambodia, Vietnam, Malay Peninsula, Borneo, Sumatra, Sulawesi, Java
* Guioa discolor Radlk. – Philippines – Endangered
* Guioa elliptica Welzen – New Guinea
* Guioa eriantha Merr. & L.M.Perry – New Guinea
* Guioa fusca Radlk. – New Caledonia endemic
* Guioa glauca (Labill.) Radlk. – New Caledonia endemic
** var. glauca – New Caledonia endemic
** var. vulgaris Welzen – New Caledonia endemic
* Guioa gracilis (Pancher & Sebert) Radlk. – New Caledonia endemic
* Guioa grandifoliola Welzen – New Guinea – Critically endangered
* Guioa hirsuta Welzen – Sulawesi
* Guioa hospita Radlk. – New Guinea – Critically endangered
* Guioa koelreuteriana (Blanco) Merr. – Borneo, Philippines, New Guinea
* Guioa lasioneura Radlk. – Qld, Australia
* Guioa lentiscifolia Cav. – Tonga endemic
* Guioa malukuensis Welzen – Moluccas – Vulnerable
* Guioa megacarpa Welzen – New Guinea
* Guioa melanopoda Merr. & L.M.Perry – W. New Guinea – Vulnerable
* Guioa membranifolia Radlk. – W. New Guinea, Moluccas
* Guioa microsepala Radlk. – New Caledonia endemic
* Guioa misimaensis Welzen – New Guinea
* Guioa molliuscula Radlk. – New Guinea – Vulnerable
* Guioa montana C.T.White – Qld, Australia
* Guioa multijuga Welzen – W. New Guinea – Vulnerable
* Guioa myriadenia Radlk. – Philippines – Endangered
* Guioa normanbiensis Welzen – New Guinea – Vulnerable
* Guioa novobritannica Welzen – New Guinea – Vulnerable
* Guioa oligotricha Merr. & L.M.Perry – New Guinea – Vulnerable
* Guioa ovalis Radlk. – New Caledonia
* Guioa palawanica Welzen – Philippines – Critically endangered
* Guioa parvifoliola Merr. – Philippines – Critically endangered
* Guioa patentinervis Radlk. – Moluccas – Vulnerable
* Guioa pauciflora Radlk. – New Guinea – Vulnerable
* Guioa pectinata Radlk. – New Caledonia endemic
* Guioa pleuropteris (Blume) Radlk. – Burma, Cambodia, Vietnam, Thailand, E. Malay Peninsula, Borneo, Sumatra, Philippines
* Guioa plurinervis Radlk. – New Guinea – Vulnerable
* Guioa pseudoamabilis Welzen – New Guinea
* Guioa pteropoda Radlk. – New Guinea, Moluccas
* Guioa pterorhachis Welzen – Borneo
* Guioa pubescens (Zoll. & Mor.) Radlk. – W. Malaysia, Singapore, Borneo, Sumatra, Banka, W. Java, Philippines
* Guioa reticulata Radlk. – Philippines – Critically endangered
* Guioa rhoifolia (A. Gray) Radlk. – Fiji, Samoa
* Guioa rigidiuscula Radlk. – New Guinea
* Guioa sarcopterifructa Welzen – Qld, Australia
* Guioa scalariformis Welzen – New Guinea – Vulnerable
* Guioa semiglauca (F.Muell.) Radlk., Guioa – Qld & NSW, Australia
* Guioa subsericea Radlk. – New Guinea
* Guioa sufusana Welzen – New Guinea
* Guioa truncata Radlk. – Philippines – Endangered
* Guioa unguiculata Welzen – New Guinea – Vulnerable
* Guioa venusta Radlk. – W. New Guinea – Vulnerable
* Guioa villosa Radlk. – New Caledonia endemic
* Guioa waigeoensis Welzen – W. New Guinea – Vulnerable

### Formerly included here

* Guioa dasyantha Radlk. ⇒ Cnesmocarpon dasyantha (Radlk.) Adema – New Guinea, Australia