Cinnamon is the brown bark of the cinnamon tree, which when dried, rolls into a tubular form known as a quill. Cinnamon is available in either its whole quill form (cinnamon sticks) or as ground powder. The tree has thick, reddish brown bark, small yellow flowers, and its leathery leaves have a spicy smell. It grows to a height of approximately 20-60 ft (8-18 m) and is found primarily in tropical forests. Cinnamon bark belongs to the Lauraceae family. Related species are Cinnamomum cassia and Cinnamomum saigonicum (Saigon Cinnamon).