Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Cassia (Cinnamomum aromaticum, synonym C. cassia) is an evergreen tree native to southern China, Bangladesh, India, and Vietnam. Like its close relative Cinnamomum verum, also known as "Ceylon cinnamon", it is used primarily for its aromatic bark, which is used as a spice. In the United States of America, cassia is often sold under the culinary name of "cinnamon", a practice banned in many [which?] other countries. The buds are also used as a spice, especially in India, and were once used by the ancient Romans. The cassia cinnamon tree grows to 10 15 m tall, with greyish bark and hard elongated leaves that are 10 15 cm long and have a decidedly reddish colour when young.