Cinnamomum cassia component called coumarin, which could damage the liver if consumed in larger amounts, European health agencies have warned against consuming high amounts of cassia. Other bioactive compounds found in the bark, powder and essential oils of "C. cassia" are cinnamaldehyde and styrene. In high doses these substances can also be toxic for humans. Cinnamomum cassia Cinnamomum cassia, called Chinese cassia or Chinese cinnamon, is an evergreen tree originating in southern China, and widely cultivated there and elsewhere in southern and eastern Asia (India, Indonesia, Laos, Malaysia, Taiwan, Thailand, and Vietnam). It is one of several species of "Cinnamomum" used primarily
Cassia fistula and the tree was depicted on a 20-rupee stamp. The golden rain tree is the national flower of Thailand; its yellow flowers symbolize Thai royalty. A 2006–2007 flower festival, the Royal Flora Ratchaphruek, was named after the tree, which is known in Thai as" ratchaphruek" (Thai: ราชพฤกษ์) and the blossoms commonly referred to as "dok koon" (Thai: ดอกคูน). "C. fistula" is also featured on a 2003 joint Canadian-Thai design for a 48-cent stamp, part of a series featuring national emblems. "Cassia acutifolia", the pudding-pipe tree, furnishes the cassia pods of commerce. In Laos, its blooming flowers known locally as "dok