Sweet Orange, alternatively considered to be a cultivar of Citrus limon, C. limon 'Limetta', is a species of citrus, commonly known as mousami, musami, sweet lime, sweet lemon, and sweet limetta, it is a member of the sweet lemons. It is small and round like a common lime in shape. It is a cross between the citron(Citrus medica) and a bitter orange(Citrus × aurantium)

Sweet Orange is a small tree seldom exceeding 30 cm diameter of the trunk. Oil dots are quite prominent, readily visible to the naked eye. Leaf blades are about 6-10 x 3-5 cm, elliptic to ovate-oblong. Leaf-stalk narrowly winged. Straight spines often present in the leaf axils. Flowers are white, fragrant. Petals are hairless, about 1.6-1.8 cm x 6-7 mm, oil dots yellowish, large and prominent, readily visible to the naked eye on the outer surface of the petals. Stamens are about 22-25, staminal filaments about 0.8-1.0 cm long. Disk is at the base of the ovary, inside the whorl of staminal filaments. Fruit is depressed globular to patelliform, about 7-11 cm in diameter, surface smooth or slightly pitted. Pulp is orange in colour, sweet. Sweet Orange is native to India, but widely cultivated world over. Flowering: September-October.

Citrus species contain a wide range of active ingredients and research is still underway in finding uses for them. They are rich in vitamin C, flavonoids, acids and volatile oils. They also contain coumarins such as bergapten which sensitizes the skin to sunlight. Bergapten is sometimes added to tanning preparations since it promotes pigmentation in the skin, though it can cause dermatitis or allergic responses in some people. Some of the plants more recent applications are as sources of anti-oxidants and chemical exfoliants in specialized cosmetics.