CORN-SALAD or LAMB'S LETTUCE, Valerianella olitoria (family Valerianaceae), a weedy annual, native of south ern Europe, but naturalized in cornfields in central Europe and in various parts of the United States and Canada, and not in frequent in Britain. In France it is used in salads during winter and spring as a substitute for lettuces, but it is less esteemed in England. The sorts principally grown are the round-leaved and the Italian; the last is a distinct species, V. eriocarpa.