H. H.  Rusby, ?An enumeration of the plants collected in Bolivia by Miguel Bang, Part 4. With descriptions of new genera and species?, Bulletin of the New York Botanical GardenBulletin of the New York Botanical Garden, vol. 4, pp. 320-321, 1907.

H. H.  Rusby, ?New species from Bolivia, collected by R.S. Williams - I?, Bulletin of the New York Botanical GardenBulletin of the New York Botanical Garden, vol. 6, pp. 504-505, 1910.