Lettuce Also known as Salad greens, Salad patta.Lettuce is a green leafy vegetable. They have green crispy leaves. When these leaves are broken they secrete white milky liquid which is bitter in taste. Mild in flavour, it has been used over the centuries as a salad green. Lettuce can be of various varieties and some of the popular ones are as follows:Iceberg: They resemble cabbage and are the mildest in flavor.