Aphyllorchis siantanensis J.J.Sm. 1932
This species was described by Smith (1932) from Pulau Siantan of the Anambas Islands, between Malaya and Borneo. It is closely related to A. borneensis (today: A. montana). A. borneensis has, in comparison, significant smaller and glabrous flowers and a shorter column. The distribution today is restricted to Borneo and the Anambas Islands (POWO 2021).