Perhaps you are talking of Yunnan CHINA Tea, a strong black / red tea.
Here you are some links I have found, including www.natureproducts, where they give some brief explanations of Chinese herbal medicines (Puer teas help in lowering cholesterol and detoxifying the body from caffeine):



http://www.teaimporters.com/Yunnan.htm

http://www.marktwendell.com/ChinaYunnan.htm

http://www.teaforlife.com

http://natureproducts.net/Medicine/tea-flower_tea.html

http://www.wollenhaupt.com/en/p3.2_e.html

There is a Yunnan green tea named Cuihua. Not sure if that is what you are looking for. If you want to find out more about Cuihua, please reply to this message. Thanks!

JinYu Tea House