Wikipedia
Saigon cinnamon (Cinnamomum loureiroi, also known as Vietnamese cinnamon or Vietnamese cassia and quế trà my, quế thanh, or " quế trà bồng" in Vietnam) is an evergreen tree indigenous to mainland Southeast Asia. Despite its name, Saigon cinnamon is more closely related to cassia ( C. cassia) than to cinnamon ( C. verum, “true cinnamon”, Ceylon cinnamon), though in the same genus as both. Saigon cinnamon has 1-5% essential oil in content and 25% cinnamaldehyde in essential oil, which is the highest of all the cinnamon species. Consequently, of the three species, Saigon cinnamon commands the highest price.
The scientific name was originally spelled as Cinnamomum loureirii, but because the species is named after the botanist João de Loureiro, this is to be treated under the ICN as an orthographic error for the correctly derived spelling of loureiroi.
Saigon cinnamon contains the highest amount of coumarin of all the four Cinnamomum species sold as cinnamon, with one study detecting 6.97 g/kg in an authenticated sample.