The Oncidiinae is a subtribe within the Orchidaceae that consists of a number of genera that are closely related.
This subtribe consists of about 70 genera with over 1000 species, with Oncidium as its largest genus. These genera consist of a single floral type based on the angle of the attachment of the lip to the column, reflecting pollinator preferences. This has however led to several unreliable results and polyphyletic taxa within Oncidium. These were transferred to Gomesa and a new genus Nohawilliamsia, has been described for Oncidium orthostates
Most species have well-developed pseudobulbs and conduplicate leaves.
It is possible to form hybrids in some instances between multiple genera within the Oncidiinae. These hybrids are often colloquially referred to as "intergenerics."
Genera
Genera recognized in Chase et al.'s 2015 classification of Orchidaceae:
Aspasia
Brassia
Caluera
Capanemia
Caucaea
Centroglossa
Chytroglossa
Cischweinfia
Comparettia
Cuitlauzina
Cypholoron
Cyrtochiloides
Cyrtochilum
Dunstervillea
Eloyella
Erycina
Fernandezia
Gomesa
Grandiphyllum
Hintonella
Hofmeisterella
Ionopsis
Leochilus
Lockhartia
Macradenia
Macroclinium
Miltonia
Miltoniopsis
Notylia
Notyliopsis
Oliveriana
Oncidium
Ornithocephalus
Otoglossum
Phymatidium
Platyrhiza
Plectrophora
Polyotidium
Psychopsiella (sometimes included in Psychopsis) Psychopsis Pterostemma Quekettia Rauhiella Rhynchostele Rodriguezia Rossioglossum Sanderella Saundersia Schunkea Seegeriella Solenidium Suarezia Sutrina Systeloglossum Telipogon Thysanoglossa Tolumnia Trichocentrum Trichoceros Trichopilia Trizeuxis Vitekorchis Warmingia Zelenkoa Zygostates
In synonymy: Ada = Brassia Odontoglossum = Oncidium
References
Mark W. Chase - A Reappraisal of the Oncidioid Orchids ; Systematic Botany, Vol. 11, No. 3 (Jul. - Sep., 1986), pp. 477–491