on another forum someone suggested that it's "Not Carpinus sp. - look at the dentations/serrations on the leaf margin. The unknown has very regular dentations. Carpinus sp. is nothing if not possessed of the most ragged edged irregular serrulations - or some term like that." and thought it might be Castanea sp. another suggestion was that it might be Dillenia indica
Yes, on second thoughts Dillenia indica is a good call. It isn't commonly found in Central / South America though. I thought Dillenia was more of an Asian shrub?
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another suggestion was that it might be Dillenia indica
it seems that the leafs match Dillenia indica.