In 2010, a molecular phylogenetic study of the pinnate Araliaceae showed that they could not be divided into genera that could easily be distinguished morphologically. Uncertainties remain about the taxonomy of this group because of a large number of unpublished species and species of uncertain affinities that have never been sampled for DNA. For these reasons, all of the pinnate Araliaceae were assigned to "Polyscias", thereby subsuming six genera ("Arthrophyllum, Cuphocarpus, Gastonia, Reynoldsia, Munroidendron," and "Tetraplasandra") into "Polyscias" and increasing the number of species in that genus from about 100 to 159.