Spiranthes romanzoffiana is accepted species in  the family Orchidaceae  subfamily: Orchidoideae, tribe: Cranichideae, subtribe: Spiranthinae,  
Genus Spiranthes 
Infraspecific taxa recognized within Spiranthes romanzoffiana: infraspecific taxa
This species is found in Great Britain, Ireland, Subarctic America to N. & WC. U.S.A..