E. D.  Merrill, ?Plantae Elmerianae Borneenses?, University of California Publications in BotanyUniversity of California Publications in Botany, vol. 15, pp. 61-74, 1929.

E. D.  Merrill, ?New species of plants from Indo-China. II?, University of California Publications in BotanyUniversity of California Publications in Botany, vol. 13, pp. 131-132, 1926.