Source: Magness et al. 1971
In this type lettuce the leaves that rise from the short stem tend to roll outward, so the leaves are largely separated during development and at harvest. Leaves may be of different shapes, from spatulate to deeply lobed or cut leaf. This is the most easily grown type of lettuce and is most popular in home gardens. It is grown somewhat for local markets, but not for distant shipment. Leaf lettuce varieties are ready for harvest in about 45 days from seeding. Exposure of edible parts is comparable to that of spinach. May be grown in greenhouses.