1997 IUCN red list of threatened plants (1997)

Flora del Río Cenepa, Amazonas, Perú - Vásquez Martínez, Rodolfo (Missouri Botanical Garden Press, 2010)

Phytologia - Moldenke, Harold N. (Harold Norman), 1909 -1996 (H.A. Gleason and H.N. Moldenke, 1993)

Rare and Threatened Plants of Cuba: ex-situ conservation in Botanic gardens (1989)

Smithsonian contributions to botany - Smithsonian Institution (Smithsonian Institution Press, 2012)