Decaisnea insignis.

Botanical name: 

Decaisnea insignis Hook. f. & Thorns. Berberideae.

Himalayas. The fruit is of a pale yellow color and is full of a white, juicy pulp that is very sweet and pleasant; the fruit is eagerly sought after by the Lepchas.

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