Lactuca sativa, or garden lettuce, is the most valuable fresh vegetables in the United States, bringing in $2.4 billion a year. Scientists and lettuce farmers are so interested in mapping the genome of the Composiate family because of its evolutionary success. There are many different types of lettuce and they grow in multiple environments which makes them the most successful family of flowering plants. Being able to see why they are so successful could help farmers genetically modify other crops in order to make them just as successful. During the mapping, scientists found that 45 million years ago the genome of lettuce was “triplicated”. This means there are three copies of each gene all showing up in different spots of DNA. It is believed that this triplication is what has given the Compositae family so much success.