Lactuca sativa is a small size annual plant that flourishes well under sandy, humus soil. There are about six varieties of cultivars exist based upon their head formation and leaf structure. Leaf varieties with more bitter taste are rather rich in nutrients as well as antioxidants. Its leaves exude milk like fluid (sap) when cut, and hence their name derived from Latin, lactuca for milk. Botanically this marvelous, nutrition rich leafy green belongs to the daisy family of Asteraceae. Scientific name: Lactuca sativa.