Origin of Sweet Lime Though the Citrus genus has many points of origins ranging from Indonesia to China, a 2004 report published in the “Agriculture Review” points to the hills of Meghalaya and Nagaland as the home of sweet limes (Citrus tanaka). On the other hand, the book, “Fruits of Warm Climates” cites a broader range of India’s central and northern regions. The fruit itself is a hybrid of a Mexican lime and sweet citron or sweet lemon.