A tropical American tree (Calycophyllum candidissimum) or its edible fruit, also known as black calabur or Jamaica cherry.
From Spanish or Caribbean native language origins, the word refers to a specific tropical tree species found in Central America and the Caribbean with pale bark and small dark berries.
The calabur tree is relatively unknown outside the Caribbean, but it's a perfect example of how indigenous fruit trees are being lost to agricultural homogenization—few people cultivate it anymore even though it's nutritious and delicious.
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