Vietnamese Cinnamon (Cinnamomum loureiroi, also known as Saigon cinnamon or Vietnamese cassia and Quế Trà My or Quế Thanh in Vietnam) is an evergreen tree in the genus Cinnamomum, indigenous to mainland Southeast Asia. Despite its name, it is more closely related to cassia (C. aromaticum) than to cinnamon (C. verum), though in the same genus as both. Vietnamese cinnamon has 1-5% essential oil in content and 25% cinnamaldehyde in essential oil, which is the highest of all the cinnamon species. Consequently, out of the three forms of Cassia, it commands the highest price.