This mango is from Cuba, and the name means “black”.
The fruit are small, ovate, and stay green when ripe. The flesh is orange, quite fibrous, with a mild classic-group flavor. The seed is polyembryonic.
Prieto trees grow slowly, and are very manageable. We planted one in 2017 for evaluation. The tree was large enough to fruit in 2019 but did not flower; it is certainly large enough to fruit in 2020 should it finally do so.