Cupania americana.

Botanical name: 

Cupania americana Linn. Sapindaceae.

Mexico. The sweet, chestnut-like seeds are used in the West Indies as a food. The seeds have the flavor of chestnut or sweet acorns and are used on the banks of the Orinoco to make a fermented liquor.

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