The southern and tropical southeastern regions of Yunnan Province, the beginning of the Tea Horse Road in southwestern China, have similar monsoonal climates and lowland tropical rain forest vegetations and this is where you will find the greatest concentration of flora in China.

Yunnan, in southwestern China, is of immense interest to biologists not only because it is situated in a transitional zone between tropical south-east Asia and temperate east Asia, but also because it was at the junction between Gondwana and Laurasia. The origin and evolution of the Yunnan flora were largely influenced by the uplift of the Himalayas, the formation of the east Asian monsoon climate and the extrusion of the Indochina block into tropical SE Asia in the later Tertiary period.
More than 9000 species are native to the province but just eight comprise the Famous Flowers of Yunnan.
More than 9000 species are native to the province but just eight comprise the Famous Flowers of Yunnan.