Calamansi (Citrofortunella microcarpa), a citrus fruit tree also known as calamondin, grows natively in the Phillipines. Calamansi trees bear small, orange-like fruits, dark green foliage and white flowers.The hardy calamansi tree grows up to about 25 feet tall at maturity. Like most other citrus trees, calamansi grows readily from seed. In the Philippines, it is available year-round, and is usually seen in its unripened green state. The unripened fruits are sour and are primarily used for cooking. When left to ripen it turns a tangerine orange.
Spotted the tree in Sheung Ling Pei, Tung Chung, Lantau Island HK.
Calamondin is widely cultivated in the Philippines, where it is called in Tagalog - kalamunding, calamansi or kalamansi; in Visayan - limonsito or simuyaw.