Dendrobium regium is accepted species in  the family Orchidaceae  subfamily: Epidendroideae, tribe: Dendrobieae, subtribe: Dendrobiinae,  
Genus Dendrobium   section: Dendrobium 
Infraspecific taxa recognized within Dendrobium regium: infraspecific taxa
This species is found in India (Chhattisgarh, Jharkhand, Orissa, Andhra Pradesh).