H. Hurd Rusby, ?New Species from Bolivia, Collected by R.S. Williams?, Bulletin of the New York Botanical Garden, vol. 6, no. 22, 1910.

E. Heinrich Snethlage, ?Neue Cecropien aus Nordbrasilien?, Notizblatt des Botanischen Gartens und Museums zu Berlin, vol. 9, no. 83, 1924.