Guioa

Guioa is a genus of about 70 described species in the maple and lychee family Sapindaceae. It has a wide distribution, ranging from mainland Southeast Asia, through Malesia and Papuasia to eastern Australia and islands of the western Pacific.^[1][2]

Many Guioa species are threatened to varying degrees, as recognised by the International Union for Conservation of Nature (IUCN). Twenty five species have IUCN statuses of either critically endangered, endangered or vulnerable.

The Australian species are known to the logging industry as cedars, though they have no direct relationship with true cedars nor the Australian members of the Meliaceae which are also known as cedars.^{[citation needed]}

Species

The following is a complete list of species accepted by Plants of the World Online. As of October 2025 there are 69 species:^[1]

• Guioa acuminata Radlk. – vulnerable^[3]
• Guioa acutifolia Radlk.
• Guioa amabilis Kaneh. & Hatus.
• Guioa aryterifolia Radlk. – endangered^[4]
• Guioa aryteroides Guillaumin
• Guioa asquamosa Welzen – vulnerable^[5]
• Guioa bicolor Merr. – vulnerable^[6]
• Guioa bijuga (Hiern) Radlk.
• Guioa capillacea A.C.Sm.
• Guioa chrysea A.C.Sm.
• Guioa comesperma Radlk.
• Guioa contracta Radlk.
• Guioa coriacea (Radlk.) Radlk.
• Guioa crenata Radlk.
• Guioa crenulata Radlk.
• Guioa diplopetala (Hassk.) Radlk.
• Guioa discolor Radlk. – vulnerable^[7]
• Guioa elegans Radlk.
• Guioa elliptica Welzen
• Guioa fusca Radlk.
• Guioa glauca (Labill.) Radlk.
• Guioa gracilis (Pancher & Sebert) Radlk.
• Guioa grandifoliola Welzen – endangered^[8]
• Guioa hirsuta Welzen
• Guioa hospita Radlk. - critically endangered^[9]
• Guioa koelreuteria (Blanco) Merr.
• Guioa koniamboensis Guillaumin
• Guioa lasioneura Radlk.
• Guioa lentiscifolia Cav.
• Guioa malukuensis Welzen – vulnerable^[10]
• Guioa megacarpa Welzen
• Guioa melanopoda Merr. & L.M.Perry – vulnerable^[11]
• Guioa membranifolia Radlk. – vulnerable^[12]
• Guioa microsepala Radlk.
• Guioa misimaensis Welzen
• Guioa molliuscula Radlk. – near threatened^[13]
• Guioa montana C.T.White
• Guioa multijuga Welzen – endangered^[14]
• Guioa myriadenia Radlk. – endangered^[15]
• Guioa normanbiensis Welzen – endangered^[16]
• Guioa novobritannica Welzen – endangered^[17]
• Guioa novoebudaensis Welzen
• Guioa oligotricha Merr. & L.M.Perry – endangered^[18]
• Guioa ovalis Radlk.
• Guioa palawanica Welzen – endangered^[19]
• Guioa parvifoliola Merr. – critically endangered^[20]
• Guioa patentinervis Radlk. – vulnerable^[21]
• Guioa pauciflora Radlk. – vulnerable^[22]
• Guioa pectinata Radlk.
• Guioa pleuropteris (Blume) Radlk.
• Guioa plurinervis Radlk. – vulnerable^[23]
• Guioa pseudoamabilis Welzen
• Guioa pteropoda Radlk.
• Guioa pterorhachis Welzen
• Guioa pubescens (Zoll. & Moritzi) Radlk.
• Guioa punctata Welzen
• Guioa reticulata Radlk. – endangered^[24]
• Guioa rhoifolia (A.Gray) Radlk.
• Guioa rigidiuscula Radlk.
• Guioa sarcopterifructa Welzen
• Guioa scalariformis Welzen – vulnerable^[25]
• Guioa semiglauca (F.Muell.) Radlk.
• Guioa subsericea Radlk.
• Guioa sufusana Welzen
• Guioa truncata Radlk. – endangered^[26]
• Guioa unguiculata Welzen – vulnerable^[27]
• Guioa venusta Radlk.
• Guioa villosa Radlk.
• Guioa waigeoensis Welzen – vulnerable^[28]

References

1. ^ "Guioa Cav.". Plants of the World Online. Board of Trustees of the Royal Botanic Gardens, Kew. 2025. Retrieved 31 October 2025.
2. ^ "Guioa Cav.". Global Biodiversity Information Facility. 2025. Retrieved 31 October 2025.
3. ^ Energy Development Corporation (EDC) . (2021). "Guioa acuminata". Vol. 2021. doi:10.2305/IUCN.UK.2021-2.RLTS.T37350A153536002.en. Retrieved 31 October 2025.
4. ^ Jimbo, T. (2021). "Guioa aryterifolia". Vol. 2021. doi:10.2305/IUCN.UK.2021-1.RLTS.T142858473A143764074.en. Retrieved 31 October 2025.
5. ^ van Welzen, P.C. (1998). "Guioa asquamosa". Vol. 1998. doi:10.2305/IUCN.UK.1998.RLTS.T37351A10046052.en. Retrieved 31 October 2025.
6. ^ Energy Development Corporation (EDC) . (2021). "Guioa bicolor". Vol. 2021. doi:10.2305/IUCN.UK.2021-3.RLTS.T37352A153536034.en. Retrieved 31 October 2025.
7. ^ Energy Development Corporation (EDC) . (2021). "Guioa discolor". Vol. 2021. doi:10.2305/IUCN.UK.2021-3.RLTS.T37353A153536066.en. Retrieved 31 October 2025.
8. ^ Jimbo, T. (2021). "Guioa grandifoliola". Vol. 2021. doi:10.2305/IUCN.UK.2021-1.RLTS.T37354A185827587.en. Retrieved 31 October 2025.
9. ^ Jimbo, T. (2021). "Guioa hospita". Vol. 2021. doi:10.2305/IUCN.UK.2021-1.RLTS.T37355A185827621.en. Retrieved 31 October 2025.
10. ^ van Welzen, P.C. (1998). "Guioa malukuensis". Vol. 1998. doi:10.2305/IUCN.UK.1998.RLTS.T37358A10046332.en. Retrieved 31 October 2025.
11. ^ van Welzen, P.C. (1998). "Guioa melanopoda". Vol. 1998. doi:10.2305/IUCN.UK.1998.RLTS.T37359A10046375.en. Retrieved 31 October 2025.
12. ^ Putri, W.U. (2024). "Guioa membranifolia". Vol. 2024. doi:10.2305/IUCN.UK.2024-1.RLTS.T169000140A169370178.en. Retrieved 31 October 2025.
13. ^ Jimbo, T. (2021). "Guioa molliuscula". Vol. 2021. doi:10.2305/IUCN.UK.2021-1.RLTS.T37360A185827660.en. Retrieved 31 October 2025.
14. ^ Putri, W.U. (2024). "Guioa multijuga". Vol. 2024. doi:10.2305/IUCN.UK.2024-1.RLTS.T37361A177980642.en. Retrieved 31 October 2025.
15. ^ van Welzen, P.C. (1998). "Guioa myriadenia". Vol. 1998. doi:10.2305/IUCN.UK.1998.RLTS.T37362A10042213.en. Retrieved 31 October 2025.
16. ^ Jimbo, T. (2021). "Guioa normanbiensis". Vol. 2021. doi:10.2305/IUCN.UK.2021-1.RLTS.T37363A185827695.en. Retrieved 31 October 2025.
17. ^ Jimbo, T. (2021). "Guioa novobritannica". Vol. 2021. doi:10.2305/IUCN.UK.2021-1.RLTS.T37364A185827725.en. Retrieved 31 October 2025.
18. ^ Jimbo, T. (2021). "Guioa oligotricha". Vol. 2021. doi:10.2305/IUCN.UK.2021-3.RLTS.T37366A198307711.en. Retrieved 31 October 2025.
19. ^ Energy Development Corporation (EDC) . (2021). "Guioa palawanica". Vol. 2021. doi:10.2305/IUCN.UK.2021-2.RLTS.T37365A153536128.en. Retrieved 31 October 2025.
20. ^ Energy Development Corporation (EDC) . (2021). "Guioa parvifoliola". Vol. 2021. doi:10.2305/IUCN.UK.2021-2.RLTS.T37367A153536162.en. Retrieved 31 October 2025.
21. ^ van Welzen, P.C. (1998). "Guioa patentinervis". Vol. 1998. doi:10.2305/IUCN.UK.1998.RLTS.T37368A10046709.en. Retrieved 31 October 2025.
22. ^ Jimbo, T. (2022). "Guioa pauciflora". Vol. 2022. doi:10.2305/IUCN.UK.2022-1.RLTS.T37369A198307753.en. Retrieved 31 October 2025.
23. ^ Lamei, P.L. (2021). "Guioa plurinervis". Vol. 2021. doi:10.2305/IUCN.UK.2021-1.RLTS.T37370A185827757.en. Retrieved 31 October 2025.
24. ^ Energy Development Corporation (EDC) . (2021). "Guioa reticulata". Vol. 2021. doi:10.2305/IUCN.UK.2021-2.RLTS.T37371A153536194.en. Retrieved 31 October 2025.
25. ^ Lamei, P.L. (2021). "Guioa scalariformis". Vol. 2021. doi:10.2305/IUCN.UK.2021-1.RLTS.T37372A185827798.en. Retrieved 31 October 2025.
26. ^ Energy Development Corporation (EDC) . (2021). "Guioa truncata". Vol. 2021. doi:10.2305/IUCN.UK.2021-3.RLTS.T37373A153536226.en. Retrieved 31 October 2025.
27. ^ Lamei, P.L. (2021). "Guioa unguiculata". Vol. 2021. doi:10.2305/IUCN.UK.2021-1.RLTS.T37374A185827832.en. Retrieved 31 October 2025.
28. ^ van Welzen, P.C. (1998). "Guioa waigeoensis". Vol. 1998. doi:10.2305/IUCN.UK.1998.RLTS.T37356A10046255.en. Retrieved 31 October 2025.

External links

• "Guioa Cav.". Atlas of Living Australia