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There are many other types of cinnamon but only four commercial types: In addition to Ceylon and Cassia, there are also Saigon and Korintje, however, the latter two are also classified as Cassia. There is also Mexican cinnamon, but it's in fact Ceylon or the Madagascar variety. Mexican cinnamon only gained its name because Mexico imports so much of it. To add to the confusion, additional names for Ceylon/Madagascar cinnamon is Real Cinnamon, True Cinnamon, Dutch Cinnamon and Sweet Cinnamon.

* https://www.wisegeek.com/what-is-mexican-cinnamon.htm

* http://cinnamon-stick.com/Mexican_Cinnamon_Sticks.html