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Safe to say it's not E. uniflora.Are you sure the fruit was ripe? My guess the fruit wanted to get a bit darker in color.Could be a mutation. Another possibility is it is a hybrid of grumichama and a similar species like E. blastantha, E. ophthalmantha or E. itaguahiensis. Hybrids sometimes have quite different characteristics from both of the parents. I trust you have already asked the seed supplier.