The lemon is a species of small evergreen trees in the flowering plant family Rutaceae, native to Asia, primarily Northeast India, Northern Myanmar or China. An acid fruit that is botanically a many-seeded pale yellow oblong berry produced by a small thorny citrus tree (Citrus limon) and that has a rind from which an aromatic oil is extracted. b : a tree that bears lemons. lemon, (Citrus ×limon), small tree or spreading bush of the rue family (Rutaceae) and its edible fruit. Lemons contain a high amount of vitamin C, soluble fiber, and plant compounds that give them a number of health benefits. Lemons may aid weight loss and reduce your risk of heart disease, anemia, kidney stones, digestive issues, and cancer. The lemon fruit structure is similar to other citrus fruits and is composed of the outer peel and the interior edible pulp. The outer peel is composed of the exterior flavedo or the epicarp and the interior white spongy part known as the albedo (mesocarp). While lemon trees can tolerate a range of soils, including poor soil, most prefer well-drained, slightly acidic soil. Lemon trees should be set slightly higher than ground. Therefore, dig a hole somewhat shallower than the length of the root ball. The true origin of lemons is not entirely known. They are thought to have originated in north-western India. It is known that lemons were introduced to southern Italy around 200 AD and have been cultivated in Egypt and Iran since 700 AD.