celtuce

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 ().

== History == Popular sources identify it as originating in the Mediterranean region and then being brought to China during the Tang dynasty, about A.D. 600–900.