mache also mâche 
(mäsh)
(mäsh)n.
Any of several plants of the genus Valerianella, especially a Eurasian annual (V. locusta) having small, white to pale bluish flowers and edible young leaves used in salads or as a potherb. Also called corn salad, lamb's lettuce.
[French mâche, from dialectal pomache, from Vulgar Latin *pōmasca, from Latin pōmum, fruit (perhaps because of its slightly sweet taste).]