''Oncotheca'' is a genus of tree endemic to

New Caledonia New Caledonia ( ; ) is a group of islands in the southwest Pacific Ocean, southwest of Vanuatu and east of Australia. Located from Metropolitan France, it forms a Overseas France#Sui generis collectivity, ''sui generis'' collectivity of t ...

. There are two species, ''

Oncotheca balansae ''Oncotheca'' is a genus of tree endemic to New Caledonia. There are two species, ''Oncotheca balansae'' and ''Oncotheca humboldtiana''. ''Oncotheca'' is the sole genus of the Oncothecaceae, which is one of three families of flowering plants en ...

'' and ''

Oncotheca humboldtiana ''Oncotheca'' is a genus of tree endemic to New Caledonia. There are two species, ''Oncotheca balansae'' and ''Oncotheca humboldtiana''. ''Oncotheca'' is the sole genus of the Oncothecaceae, which is one of three families of flowering plants en ...

''. ''Oncotheca'' is the sole genus of the Oncothecaceae, which is one of three families of flowering plants

endemic Endemism is the state of a species being found only in a single defined geographic location, such as an island, state, nation, country or other defined zone; organisms that are indigenous to a place are not endemic to it if they are also foun ...

. Its placement has been enigmatic for a long time, but a recent phylogenetic analysisStull, G. W., R. Duno de Stefano, D. E. Soltis, and P. S. Soltis. (2015). Resolving Basal Lamiid Phylogeny and the Circumscription of Icacinaceae with a Plastome-Scale Data Set.” American Journal of Botany 102 (11): 1794–1813. doi:10.3732/ajb.1500298. based on 73 plastid genes found it to be sister to

Icacinaceae The Icacinaceae, also called the white pear family, are a family (biology), family of flowering plants,"Icacinaceae" At: Angiosperm Phylogeny Website At: Missouri Botanical Garden Website (see ''External links'' below). consisting of trees, shrub ...

. It is now placed in the order

Icacinales Icacinales is an order of flowering plants. The order did not exist in the 2009 APG III system, and was added in the 2016 APG IV system, including two families, Icacinaceae The Icacinaceae, also called the white pear family, are a family (b ...

References

Asterids Trees of New Caledonia Endemic flora of New Caledonia Asterid genera Taxa named by Henri Ernest Baillon {{NewCaledonia-stub