A generic transfer of eight species from Oncidium to Odontoglossum is made here, supported by molecular and morphologic evidence. Homotypic synonyms are listed. These transfers make it possible to maintain a monophyletic genus Odontoglossum without creating any new generic names. Quotes from authors that favor a larger and morphologically indefinable Oncidium are included and responded to by the authors of this paper, who are in favor of maintaining a more conservative and traditional, as well user-friendly and visually workable taxonomic classification.