Small tree with an irregular crown. The branches have an irregular surface, are spiny and and greenish in colour. The leaves are lance-shaped to oval and dark green. The flowers are scented, white tinted with violet to purple. Produces fruit which is oval, elongated and golden yellow in colour. The lemon (Citrus × limon) is a small evergreen tree native to Asia, and the tree's ellipsoidal yellow fruit. The fruit is used for culinary and non-culinary purposes throughout the world, primarily for its juice, though the pulp and rind (zest) are also used in cooking and baking. The juice of the lemon is about 5% to 6% citric acid, which gives lemons a sour taste. The distinctive sour taste of lemon juice makes it a key ingredient in drinks and foods such as lemonade. A lemon tree has fruit and flowers. The origin of the lemon is a mystery, though it is thought that lemons first grew in Assam (a region placed in Northeast India), northern Burma, and China. A study of the genetic origin of the lemon reported that it is a hybrid between sour orange and citron.