By the by, as I was ransacking the internets to figure out what my plant was, I found an old RFCI Australia fact sheet on the native fruits of Brazil--from 1991!
It has Plinia Rivularis on it as well as common Jaboticaba, but not Cambuca or any of the other relatives of Jaboticabas. Also a couple of other fruits that are obscure today. I thought this was very weird when I found it.