Lettuce and Other Composite Vegetables
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The Asteraceae is a widely distributed and very large family of about 800 genera and possibly 20,000 species, of which relatively few are cultivated. The previous family name of Compositae was representative of the composite of many florets typically found in the compact involucrate head. What may appear as a single flower is actually the composite of many individual flowers. Another characteristic of many Asteraceae species is the milklike latex contained in stems and other tissues. Dried latex has some narcotic properties and has been used as a sedative. Lactucarium, the dried latex produced from Lactuca virosa has drug use.
KeywordsFlower Head Storage Root Globe Artichoke Lettuce Cultivar Lettuce Mosaic Virus
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