Closeup of heads of Romaine lettuce near Five Points, San Joaquin Valley, Calif. —Ed Young/Design Pics Editorial/Universal Images Group—Getty ImagesIn the town of Nipomo on the central coast of California, in Bill Waycott's fields, lettuces of the future are taking root. Red-furled or dark-leaved, these rosettes of crunchy goodness might someday make it to a store near you. Waycott is an independent plant breeder, one of the small community of d…