Dendrobium bigibbum is accepted species in  the family Orchidaceae  subfamily: Epidendroideae, tribe: Dendrobieae, subtribe: Dendrobiinae,  
Genus Dendrobium   section: Phalaenanthe 
Infraspecific taxa recognized within Dendrobium bigibbum: infraspecific taxa
This species is found in S. New Guinea to Queensland (N. & W. Cape York Pen.).