Oxyria digyna.

Botanical name: 

Oxyria digyna Hill. Polygonaceae. Mountain Sorrel.

Mountains of the north and arctic region, northern America as far as latitude 64˚ to 80˚ north. The leaves are chopped with scurvy grass or water cress and are fermented and eaten by the Alaska Indians, who are very partial to this dish.

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