Ten provenance/progeny tests of Bombacopsis quinata were established in Venezuela and Colombia using open-pollinated (OP) seed collected from throughout its natural range. In addition, two full-sib progeny tests were established in Colombia with seed from crosses made in a second-generation seed orchard. Average survival of all tests was approximately 80%, with the local source from Colombia (Atlantico) having slightly better survival in Colombia. Average growth rates at age 8 years were 6-7m height and 12-13cm DBH. Provenancexcountry interaction was highly significant between Colombia and Venezuela, although at a within-provenance level, families performed relatively consistently in the two countries (r B g =0.58). There was no important genotypexenvironment interaction at the provenance or family level between test sites in the same country. There were large provenance effects in both countries. In Colombia, two provenances from Nicaragua (Hacienda San Juan and Los Playones) performed as well as the local source, with 11-16% more volume than average. In Venezuela, provenances originating in areas of 1600-2100mm of annual rainfall (Choluteca, Honduras, and Guanacaste, Costa Rica) had volumes 26% above average, while the local source performed poorly both in survival and growth. Heritabilities for growth traits are moderate and increase with age up to 0.25-0.30 at age 8 years. Dominance variance is relatively unimportant as it is approximately 14 or less than the size of additive variance. After the appropriate provenances have been identified, additional genetic gains of up to 50% in volume are possible from family and within family selection.