Bitter Orange, also known as Seville orange (Bigarade orange), is one of the many types of oranges, and one the most important citruses used in modern perfume industry. Bitter orange is a main source of orange blossom and neroli extracts, prized for their delicious fragrance and wonderful and fresh bitter-sweet citrusy aroma. Bitter Orange grows in warm parts of the world, but the best quality oil is produced of peel from Spanish and Guinean orange. The odor of bitter orange is fresh, tart and hot and bitter.