Enhalus koenigii.

Botanical name: 

Enhalus koenigii Rich. Hydrocharitaceae. Sea Fruit.

Sumatra. The fruits are called berak laut, or sea fruit. The seeds are slightly farinaceous and taste like chestnuts soaked in salt water. This fruit is round, hairy and generally much covered with mud.

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