Grogan, R. G. Department of Plant Pathology, University of California, Davis, California.
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A cool-season annual, Lactuca sativa, of Asian origin and belonging to the tribe Cichorium of the Compositae family. Lettuce (see illustration) is grown for its succulent leaves, which are eaten raw as a salad. Four varieties of this leading salad crop are head lettuce (L. sativa var. capitata), leaf or curled lettuce (L. sativa var. crispa), cos or romaine lettuce (L. sativa var. longifolia), and stem or asparagus lettuce (L. sativa var. asparagina). There are two types of head lettuce—butterhead and crisphead or iceberg. See also: Asterales
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