Cymbidium dayanum is accepted species in  the family Orchidaceae  subfamily: Epidendroideae, tribe: Cymbidieae, subtribe: Cymbidiinae,  
Genus Cymbidium   section: Himantophyllum 
Infraspecific taxa recognized within Cymbidium dayanum: infraspecific taxa
This species is found in Himalaya to S. Japan and Malesia.