Trigonobalanus
Trigonobalanus doichangensis
Scientific classification
Kingdom:	Plantae
Clade:	Tracheophytes
Clade:	Angiosperms
Clade:	Eudicots
Clade:	Rosids
Order:	Fagales
Family:	Fagaceae
Subfamily:	Quercoideae
Genus:	Trigonobalanus Forman
Species
See text
Synonyms
Colombobalanus Nixon & Crepet 1989 Formanodendron Nixon & Crepet 1989

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

• WCSP: Trigonobalanus^{[permanent dead link‍]}
• Thai BFK Forest Herbarium: Trigonobalanus doichangensis (description and photos)
• Flora of China: Formanodendron doichangensis (with drawing)
• Drawing of Trigonobalanus verticillata^{[permanent dead link‍]}
• Photo of Colombobalanus excelsa