Lots of cool stuff to look through but the very first page had me looking askance. The taxonomy listed [courtesy of Nguyen Ngoc Kinh (1979)] seemed weird, and this seemed quite the unsubstantiated bombshell:
Djemukhatze (1976) did a survey on wild tea plants in a number of places in Viet Nam (Ha
Giang, Nghia Lo, Lao Cai, and Tam Dao) and based on the biochemical evolution of the tea,
he concluded that the tea was originates from Viet Nam.
I guess everyone has a right to their own ethnocentric bias....