Oncidium oliganthum is accepted species in  the family Orchidaceae  subfamily: Epidendroideae, tribe: Cymbidieae, subtribe: Oncidiinae,  
Genus Oncidium   section: Stellata 
Infraspecific taxa recognized within Oncidium oliganthum: infraspecific taxa
This species is found in Mexico (Oaxaca, Chiapas) to El Salvador.