Real Dictionary

corn salad in American English
a European herb (Valerianella locusta) of the valerian family, often found in cornfields, with rose, blue, or white flowers and leaves that are used in salads
noun: any of several plants of the genus Valerianella, of the valerian family, esp. V. locusta (or V. olitoria), having small light blue flowers and tender, narrow leaves eaten in salads

corn salad in British English
noun: any valerianaceous plant of the genus Valerianella, esp the European species V. locusta, which often grows in cornfields and whose leaves are sometimes used in salads