J. F.  Macbride, ?Spermatophytes, mostly Peruvian - III?,  Publications of the Field Museum of Natural History, Botanical Series, vol. 11, no. 1, pp. 3-35, 1931.

H. Ruiz López and Pavon, J. Antonio, ?Flora Peruviana, et Chilensis IV (Laurographia)?. p. Plates CCCXLV - CCCLXXII, 1804.