Small shrubby tree, c. 2 m tall, not spiny. Leaves 6.5 x 3.2 cm, obovate to broadly-ovate, obtuse, margin crenulate; petiole very narrowly margined. Flowers bisexual, solitary. Fruit 30 x 27 mm, oblate; rind thin, orange-red, smooth and loosely attached; core hollow. Pulp deep orange, acid.

Type: Not designated.

Calamondin orange is usually cultivated in pots as a dwarf ornamental. It blooms throughout the year. Its bitter acid fruit may be used instead of lime.