Cinnamomum cassia United Kingdom, and India is Chinese cinnamon. "Indonesian cinnamon" ("C. burmannii") is sold in much smaller amounts. Chinese cassia is produced in both China and Vietnam. Until the 1960s, Vietnam was the world's most important producer of Saigon cinnamon, which has a higher oil content , and consequently has a stronger flavor. Because of the disruption caused by the Vietnam War, however, production of Indonesian cassia in the highlands of the Indonesia island of Sumatra was increased to meet demand. Indonesian cassia has the lowest oil content of the three types of cassia, so commands the lowest price. Chinese cassia
Cassia fistula Cassia fistula Cassia fistula, known as golden rain tree, canafistula, and other names, is a flowering plant in the family Fabaceae. The species is native to the Indian subcontinent and adjacent regions of Southeast Asia. It ranges from eastward throughout India to Myanmar and Thailand and south to Sri Lanka and southern Pakistan. It is the state flower of Kerala in India and of immense importance amongst the Malayali population. It is a popular ornamental plant and is also used in herbal medicine. In ancient Tamil literature, it is called கொன்றை (kondrai) and is closely associated with the Mullai (forest)