Description: The Calamondin lime looks like a kumquat in size, shape and color. In tropical environments it may remain green when fully mature, but develops a rich orange color in most other climates. It has a very thin adherent skin with five to ten seeds and seven to nine segments. It is extremely tart and acidic even when fully ripe and should not be eaten whole like a kumquat. Rather, it is usually only used as a juicing citrus.