This genus contains many species that were previously assigned to "Oncidium". No. 1 "Oncidium oerstedii" with photographs. It was formerly included in the massively paraphyletic "wastebin genus" "Oncidium". This has however led to several unreliable results and polyphyletic taxa within "Oncidium". Olof Swartz later transferred the species to "Oncidium" in 1800. "Erycina pusilla" is a promising model candidate for "Oncidium" research. When looking for the "Oncidium tigrinum" orchid, he climbed to 3000 metres above sea level. Most species in the Oncidium genus are epiphytes, although some are lithophytes or terrestrials. Oncidium ornithorhynchum is a species of orchid found from Mexico to Colombia. Oncidium praetextum is a species of orchid endemic to southern and southeastern Brazil. Oncidium maculatum is a species of orchid occurring from Mexico to Central America. Oncidium varicosum is a species of orchid ranging from Brazil to northern Argentina. Oncidium gardneri is a species of orchid native to southern and southeastern Brazil. Oncidium harryanum is a species of orchid native to Colombia, Ecuador, and Peru. Oncidium pectorale is a species of orchid endemic to Brazil (Rio de Janeiro).