Abstract
Lettuce (Lactuca sativa L.) is a selfpollinating annual with a life cycle (seed to seed) of 4 to 6 months, depending on type and season. Crisphead lettuce flowers in 125 to 150 days when grown in the greenhouse under mostly long days. The life cycle is in two phases. The vegetative phase includes germination, rosette formation, head formation, and head maturity. This phase is followed by seed stalk elongation, flowering, and seed formation. Seeds mature on each capitulum 12 to 14 days after the flower opens. An early flowering mutant plant was found in a planting of crisphead lettuce seedlings (Ryder, 1983). Crosses to cultivars and other mutant lines have produced a group of lines with the early flowering trait, several of which have proved useful in lettuce genetic, breeding, and physiological studies. Origin A single mutant plant, USDA 56679E, was
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