Decaffeination this trait could be bred into other coffee plants by crossing them with "C. charrieriana", or an equivalent effect could be achieved by knocking out the gene for caffeine synthase in normal coffee plants. Tea may also be decaffeinated, usually by using processes analogous to the direct method or the CO process, as described above. The process of oxidizing tea leaves to create black tea ("red" in Chinese tea culture) or oolong tea leaves from green leaves does not affect the amount of caffeine in the tea, though tea-plant subspecies (i.e., "Camellia sinensis sinensis" vs. "Camellia sinensis assamica") may differ
Angelica sinensis Angelica sinensis Angelica sinensis, commonly known as dong quai or "female ginseng" is a herb from the family Apiaceae, indigenous to China. "Angelica sinensis" grows in cool high altitude mountains in China, Japan, and Korea. The yellowish brown root of the plant is harvested in fall and is a well-known Chinese medicine used over thousands of years. The dried root of "A. sinensis" is commonly known as Chinese angelica () and is widely used in Chinese traditional medicine in the belief it benefits women's health, cardiovascular conditions, osteoarthrosis, inflammation, headache, infections, mild anemia, fatigue and high blood pressure. The dong