Cassia comes from another kind of cinnamon tree, called Cinnamomum cassia, and it doesn't require as much time or effort to make. Cassia bark is hard and sturdy, so quills are made as one curled ...

Cinnamon obtained from the bark of Cassia trees (left) contains widely varying amounts of coumarin, a potential liver toxin, even among samples taken from a single tree. Disclaimer: AAAS and ...