Citrus x microcarpa’s calamansi limes, a citrus fruit, are thought to be a cross between kumquats (Citrus japonica) and mandarin oranges (Citrus reticulata). The words calamansi and calamondin are occasionally spelled kalamansi and kalamondin, respectively; they are also referred to as Philippine limes, Philippine lemons, or calamondin. They are indigenous to China, Indonesia, and the Philippines.

Calamansi limes are tiny fruits that typically have a diameter of about an inch (2,54 cm) and a weight of about 30 grams. They can be rounded or barely flattened. The fruit’s thin, glossy skin can be consumed with the rest of the fruit. In fact, the fruit itself is not as sweet as the skin.