The different types of citrus fruits are zesty and tangy and are packed full of flavor. The taste of citrus fruits is a varying combination of sweet and sour flavors that refresh, delight, and invigorate your taste buds. There are over 100 different varieties of citrus fruits. Citrus fruits such as lemons and limes can be so sour, they make your mouth pucker. Others such as oranges are delicious and sweet with a slightly tangy taste.