[7] A consensus announced in April 2013 resulted in major taxonomic changes to Oncidium, Gomesa, Odontoglossum, Miltonia, and others.

[8] Much of this debate and subsequent housekeeping was initiated by significant research for the scientific publication Genera Orchidacearum Volume 5.

One significant change is the move of most Brazilian Oncidium with a fused lateral sepal to the genus Gomesa.

They can be divided into three categories, according to their growth pattern: Oncidium species are characterised by the following properties : The flowers come in shades of yellow, red, white and pink.

They are very varied and are easily hybridised with other closely related genera forming the Oncidium alliance (Miltonia, Cuitlauzina, Miltoniopsis, Leochilus, Comparettia, Cyrtochilum, Tolumnia, Rhynchostele [formerly Lemboglossum], Psychopsis, etc.).