Memecylon edule.

Botanical name: 

Memecylon edule Roxb. Melastomaceae.

Coromandel, tropical India and Burma. The juicy fruit is eaten by the natives when ripe. They have much pulp of a bluish-black color and of an astringent quality. The pulp of the fruit, though rather astringent, is eaten by the natives.

Sturtevant's Edible Plants of the World, 1919, was edited by U. P. Hedrick.