Next is the perennial, burger-topping iceberg lettuce. You'll need 33 cups of ... This pretty red and green leaf is chard. And it's a powerhouse. We're talking 300% of your daily vitamin K.

Red and green leaf lettuce have the same vitamins and nutrients as romaine and are also good sources of anthocyanins, an antioxidant found in fruits and vegetables that are dark red or purple.

dark green leaves and a slightly bitter taste, it's a staple in Caesar salads. Butterhead Lettuce: Its soft, buttery leaves have a mild flavor, making it a favorite for salads. Leaf Lettuce ...