That forum is not only for "South American plants" if there's even such a thing(or did you mean tropical plants?). It's a Spanish forum used mainly but not exclusively by spanish speaking users.
Yes, of course that forum is not only for "SA plants", but there are great plant enthusiasts from SA and maybe they can help ID the native plants... Yup, I'm also an enthusiastic user there (too)! :) But unfortunately without spanish knowledge... :(((
Thank you. Infojardin may hold promise but runs the gamut from Spain to South America. I will try posting a native Colombian species and see what comes back.