In 2010, a study of four chloroplast DNA intergenic spacers showed that part of "Clerodendrum" was closer to the New world genera than to other "Clerodendrum", and that one species of "Clerodendrum" was nested within the clade of New World genera. The authors of this study resurrected the genus "Volkameria" and assigned to it about 30 species that had been in "Clerodendrum". They also resurrected "Ovieda" as a monotypic genus consisting of " Ovieda spinosa". "Volkameria" and "Ovieda" had been erected by Linnaeus in 1753. Modern cladistic analysis has largely vindicated his concepts of "Clerodendrum" and its relatives.