Spathoglottis arunachalensis (Orchidaceae), a new species from Arunachal Pradesh, India

A new species of  Spathoglottis ,  S. arunachalensis (Orchidaceae), from Sessa Orchid Sanctuary in Arunachal Pradesh is described and illustrated. Morphologically, the new species is allied to S. ixioides but differs in many attributes which are discussed here. An updated key for Indian Spathoglottis is also provided for easy identification.