Citrus limetta, alternatively considered to be a cultivar of Citrus limon, C. limon 'Limetta', is a species of citrus, commonly known as mousami, musami, mosambi, 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 and a bitter orange.

The lemon is a species of small evergreen tree in the flowering plant family Rutaceae, native to Asia, primarily Northeast India (Assam), Northern Myanmar, and China.