A bitter orange is a citrus tree of the species Citrus aurantium, or of the species Citrus limetta, or the fruit of these species.

The flavour comes from the rind of the Bergamot orange (citrus bergamia) Citrus Bergamia is a hybrid of Citrus Limetta and Citrus Aurantium

Citrus limetta, the Mediterranean sweet lemon or sweet lime.

Citrus limetta is a species of citrus. Common names for varieties of this species include sweet limetta, Mediterranean sweet lemon, sweet lemon, and sweet lime. In Iran it is called Limu Shirin لیمو شیرین (in Persian: Limu = Lemon and Shirin = Sweet). In India, it is commonly called sathukudi, mousambi, mosambi, or musambi.[1]

Moosambi is a fruit of the citrus family and the species limetta -Citrus Limetta - and in North America, generally identified with the common term "Orange".

In southern India, Orange generally denotes "kittale hannu", whereas in North America, moosambi is Orange.

The southern Indian "kittale hannu" is known as "minneola", "mandarin orange" and other names for slightly different varieties of orange family.

Also check wikipedia for "moosambi" and orange.