Corn salad (Valerianella locusta)
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Corn salad (Valerianella locusta) is a small dicot annual plant of the family Valerianaceae. It is also called Lewiston cornsalad, fetticus, mache, mâche, doucette, rampon, rampien, lamb’s lettuce, field salad (de.wikipedia.org/wiki/Feldsalat), nüssli, nüsslisalat, and rapunzel.
Corn salad grows in a low rosette with spatulate leaves up to 15.2cm long. It is a hardy plant that grows to zone 5, and in mild climates it is grown as a winter green. In warm conditions it tends to bolt to seed.
Corn salad grows wild in parts of Europe, northern Africa and western Asia. In Europe and Asia it is a common weed in cultivated land and waste spaces. In North America it has escaped cultivation and become naturalized on both the eastern and western seaboards.
Mache was originally foraged by European peasants until the royal gardener of King Louis XIV, de Quintinie, introduced corn salad to the world. 
Like other formerly foraged greens, mache has many nutrients, including three times as much Vitamin C as lettuce, beta-carotene, B6, B9, Vitamin E, and omega-3 fatty acids.