Arenaria peploides.

Botanical name: 

Arenaria peploides Linn. Caryophylleae. Sea Chickweed.

North temperate and Arctic regions. In Iceland, the plant is fermented and in that state used as food, like sauerkraut; the plant also forms a wholesome vegetable when boiled and is used for a pickle.

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