The native tree species used were Handroanthus chrysanthus (Jacq.) S.O Grose (synonym Tabebuia chrysantha), Cedrela montana Moritz ex Turcz, and Heliocarpus americanus L. Seeds were collected in the natural forest at Reserva Biológica San Francisco (RBSF) belonging to the Podocarpus National Park, Zamora-Chinchipe Province (03°58′ S, 79°04′ W) in the south of Ecuador.