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Also known as Lactuca sativa var. angustana, Lactuca sativa angustana, qingsun, wosun

Celtuce () (Lactuca sativa var. augustana, angustata, or asparagina), also called stem lettuce, celery lettuce, asparagus lettuce, or Chinese lettuce, is a cultivar of lettuce grown primarily for its thick stem or its leaves, which are known as A-choy. It is used as a vegetable. In China, the family is informally called woju (), which is also the name of a cultivar. It is especially popular in both China and Taiwan, where the stem is interchangeably called wosun () or ().