Cyrtochilum retusum is accepted species in  the family Orchidaceae  subfamily: Epidendroideae, tribe: Cymbidieae, subtribe: Oncidiinae,  
Genus Cyrtochilum   section: Heterantha 
Infraspecific taxa recognized within Cyrtochilum retusum: infraspecific taxa
This species is found in S. Ecuador to N. Peru.