All teas come from the leaves of the plant Camellia sinensis. In general, the four varieties of the plant Camellia sinensis are cultivated commercially, including China types, Assam (India) types, Hybrid types (China and Assam types), and Cambodia types. The tea leaves of the plant Camellia sinensis form chemicals known as polyphenols to protect themselves against diseases found in nature. Tea polyphenols are composed of flavonoids, caffeine, and fluoride. As a result, fresh tealeaves contain rich health-promoting polyphenols.
- Rasmussen, Wendy and Rhinehart, Ric, Tea Basics: A Quick and Easy Guide, John Wiely & Son, New York, NY, 1999