Cassia is an aromatic bark, similar to cinnamon, but differing in strength and quality. Its bark is darker, thicker and coarser, and the corky outer bark is often left on. The outer surface is rough and grayish brown, the inside barks is smoother and reddish-brown. It is less costly than cinnamon and is often sold ground as cinnamon. When buying as sticks, cinnamon rolls into a single quill while cassia is rolled from both sides toward the centre so that they end up resembling scrolls. Cassia buds. Cassia buds resemble cloves. They are the dried unripe fruits about 14 mm (1/2 in) long and half as wide. It is native to Burma and grown in China, Indo-China, the East and West Indies and Central America. One of the oldest spices known to man. It has a strong characteristic aroma and flavor. We may sometimes hear cinnamon refer to as cassia. This term is used to distinguish between the Southeast Asia and the Ceylon type of cinnamon. Almost all of the cinnamon consumed in the United States is derived from trees grown in Southeast Asia. Nowadays cinnamon is used to flavor bakery and dairy products, as well as drinks. Cassia-cinnamon is such a familiar and beloved spice it needs little introduction. A global favorite for its delicious aromatic flavor.