The bitter orange tree, scientifically known as *Citrus aurantium*, is a small evergreen tree native to Southeast Asia. It typically grows to about 10-30 feet tall and features glossy, dark green leaves and fragrant white flowers. The tree produces small, round, orange fruits that are sour and bitter, making them less popular for eating fresh. Bitter orange is often used in traditional medicine and as a flavoring agent in food and beverages. Its essential oil is extracted for use in perfumes and aromatherapy. Additionally, the tree is cultivated in various regions, including the Mediterranean and parts of the Americas.