“…Floral characters such as bracts, sepals, petals, lip, and column were observed and measured with the help of a stereomicroscope. Literature, including Hooker (1890), King and Pantling (1898), Tang and Wang (1937, 1940), Pradhan (1976), Lang (1988), Press et al (2000), Pearce and Cribb (2000; 2001), Boufford (2003), Chen et al (2009), Agrawala et al (2010), Averyanov (2010), Raskoti (2012, 2013), Ormerod (2013), Kurzweil (2010), and Kurzweil and Lwin (2014), was consulted for general distribution data and to assess some morphological characters of species we have been unable to examine ourselves. Thirty-seven morphological characters were compared (see Raskoti et al 2016), and a set of diagnostic characters was chosen for the preparation of a dichotomous key.…”