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{{Italic title}}{{taxobox
|name = Trigonobalanus
|image = Trigonobalanus doichangensis - Kunming Botanical Garden - DSC03195.JPG
|image_caption = Trigonobalanus doichangensis
|regnum = Plantae
|unranked_divisio = Angiosperms
|unranked_classis = Eudicots
|unranked_ordo = Rosids
|ordo = Fagales
|familia = Fagaceae
|genus = Trigonobalanus
|subdivision_ranks = Species
|subdivision = See text.
|synonyms =- Colombobalanus Nixon & Crepet 1989
- Formanodendron Nixon & Crepet 1989
}}{{Commons category}}Trigonobalanus is a genus of three species of evergreen trees in the family Fagaceae, related to oaks, beeches and chestnuts. The species are widely scattered, with one in northern South America and two in southeast Asia; some botanists treat the three species in separate genera. The three species, with their authors, major synonyms, and distribution, are: - Trigonobalanus doichangensis (A. Camus) Forman (syn. Formanodendron doichangensis (A. Camus) Nixon & Crepet) - subtropical Yunnan to northern Thailand
- Trigonobalanus excelsa Lozano, Hern. Cam. & Henao (syn. Colombobalanus excelsa (Lozano, Hern. Cam. & Henao) Nixon & Crepet) - endemic to Colombia
- Trigonobalanus verticillata Forman - tropical Indonesia and the Malay Peninsula
External links- WCSP: Trigonobalanus{{Dead link|date=July 2018 |bot=InternetArchiveBot |fix-attempted=no }}
- [https://web.archive.org/web/20050318071534/http://www.dnp.go.th/Botany/plant%20of%20the%20month/htm/Trigonobalanus%20doichangensis.htm Thai BFK Forest Herbarium: Trigonobalanus doichangensis (description and photos)]
- Flora of China: Formanodendron doichangensis (with drawing)
- Drawing of Trigonobalanus verticillata{{Dead link|date=July 2018 |bot=InternetArchiveBot |fix-attempted=no }}
- [https://web.archive.org/web/20020623170328/http://biodiversity.uno.edu/delta/angio/images/colom01.jpg Photo of Colombobalanus excelsa]
{{Taxonbar|from=Q5220438}}{{Fagales-stub}} 1 : Fagaceae |