WEBCeltuce ( /ˈsɛlt.əs/) ( Lactuca sativa var. augustana, [3] [4] [5] angustata, or asparagina ), also called stem lettuce, [6] celery lettuce, asparagus lettuce, [7] or Chinese lettuce, is a cultivar of lettuce grown primarily for its thick stem or its leaves. It is used as a vegetable.