Various editors, Curtis's Botanical Magazine, Volume 58…
“ Perianthium ringeus, tetraphyllum, foliolo inferiore bifido, (e duobus infra cohærentibus conflato.) Labellum unguiculatum, subinclusum. Lamina basi appendicaluta v. gibbosa. Ungue infra labio inferiore connato. Columna basi galca connata, apice alata. ”
