Citrus sinensis is a small tree in the Rutaceae (citrus family) that originated in southern China. Oranges are now grown commercially worldwide in tropical, semi-tropical, and some warm temperate regions, and have become the most widely planted fruit tree in the world.
The orange tree is small, spiny tree, typically growing to 7.5 m (25 ft), but occasionally reaching heights up to 15 m (50 ft), generally with a compact crown. Leaves are leathery and evergreen, and range from elliptical to oblong to oval, 6.5-15 cm long and 2.5-9.5 cm wide, often with narrow wings on the petioles (leaf stems). The fragrant white flowers, produced singly or in cluster of up to 6, are around 5 cm wide, with 5 petals and 20 to 25 yellow stamens. The fruit, which may be globose to oval, is typically 6.5 to 9.5 cm wide, and ripens to orange or yellow.