Gastrochilus formosanus is accepted species in  the family Orchidaceae  subfamily: Epidendroideae, tribe: Vandeae, subtribe: Aeridinae,  
Genus Gastrochilus   section: Microphyllae 
Infraspecific taxa recognized within Gastrochilus formosanus: infraspecific taxa
This species is found in China (S. Shaanxi, W. Hubei, N. Fujian), Taiwan.