Context: Lactuca, commonly known as lettuce, is a genus of flowering plants in the daisy family, Asteraceae. The genus includes at least 50 species, distributed worldwide, but mainly in temperate Eurasia., Celtuce ( Lactuca sativa var. asparagina , augustana , or angustata ) , also called stem lettuce , celery lettuce , asparagus lettuce , or Chinese lettuce , IPA ( UK , US ) / slt.s / , is a cultivar of lettuce grown primarily for its thick stem , used as a vegetable . It is especially popular in China , and is called wosun ( Chinese :  ; pinyin : wsn ) or woju ( Chinese :  ; pinyin : wjù ) ( although the latter name may also be used to mean lettuce in general ) . The stem is usually harvested at a length of around 15 -- 20 cm and a diameter of around 3 -- 4 cm. It is crisp , moist , and mildly flavored , and typically prepared by slicing and then stir frying with more strongly flavored ingredients ., In everyday usage, a vegetable is any part of a plant that is consumed by humans as food as part of a savory meal. The term "vegetable" is somewhat arbitrary, and largely defined through culinary and cultural tradition. It normally excludes other food derived from plants such as fruits, nuts, and cereal grains, but includes seeds such as pulses. The original meaning of the word "vegetable", still used in biology, was to describe all types of plant, as in the terms "vegetable kingdom" and "vegetable matter"., Common chicory, "Cichorium intybus", is a somewhat woody, perennial herbaceous plant of the dandelion family Asteraceae, usually with bright blue flowers, rarely white or pink. Many varieties are cultivated for salad leaves, chicons (blanched buds), or roots (var. "sativum"), which are baked, ground, and used as a coffee substitute and additive. It is also grown as a forage crop for livestock. It lives as a wild plant on roadsides in its native Europe, and is now common in North America, China, and Australia, where it has become widely naturalized. "Chicory" is also the common name in the United States for curly endive ("Cichorium endivia"); these two closely related species are often confused., Leaf vegetables, also called potherbs, greens, vegetable greens, leafy greens, or salad greens, are plant leaves eaten as a vegetable, sometimes accompanied by tender petioles and shoots. Although they come from a very wide variety of plants, most share a great deal with other leaf vegetables in nutrition and cooking methods., Asteraceae or Compositae (commonly referred to as the aster, daisy, composite, or sunflower family) is an exceedingly large and widespread family of flowering plants (Angiospermae)., Lettuce ("Lactuca sativa") is an annual plant of the daisy family, Asteraceae. It is most often grown as a leaf vegetable, but sometimes for its stem and seeds. Lettuce is most often used for salads, although it is also seen in other kinds of food, such as soups, sandwiches and wraps; it can also be grilled. One variety, the ", or asparagus lettuce (celtuce), is grown for its stems, which are eaten either raw or cooked. In addition to its main use as a leafy green, it has also gathered religious and medicinal significance over centuries of human consumption. Europe and North America originally dominated the market for lettuce, but by the late 20th century the consumption of lettuce had spread throughout the world. World production of lettuce and chicory for calendar year 2013 was 24.9 million tonnes, over half of which came from China., Plants are mainly multicellular, predominantly photosynthetic eukaryotes of the kingdom Plantae., Subject: celtuce, Relation: taxon_rank, Options: (A) family (B) genus (C) kingdom (D) species (E) variety
Output: variety