The Calamansi is a smooth and slightly spiny plant, growing to a height of 3 to 5 meters. Leaflets are elliptic to oblong-elliptic of 4 to 8 inches long. Petioles are narrowly and scarcely winged, about a centimeter long. Flowers are axillary, solitary, rarely in pairs, white, and short-stalked. Fruit is yellow when ripe, nearly spherical, 2 to 3.5 cm diameter, and thin-skinned. The skin or peel is green to yellowish green or yellow, loosely adhering to the flesh. The flesh contains a few light orange seeds. [Philippine Medicinal Plants]