Cakile maritima.

Botanical name: 

Cakile maritima Scop. Cruciferae. Sea Rocket.

Europe, northern Africa and North America. Kalm says the sea rocket furnishes a root in Canada which is pounded, mixed with flour and eaten, when there is a scarcity of bread.

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