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Oncotheca is a genus of tree endemic to
/ref> Oncotheca balansae and Oncotheca humboldtiana.
Oncotheca is the sole genus of the Oncothecaceae, which is one of three families of flowering plants endemic to New Caledonia. 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. It is now placed in the order Icacinales.
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