Understanding how alpine biota respond to historical environmental changes can improve our ability to predict and mitigate the threats to alpine species from global warming. In the world's rich temperate alpine flora, that is, the alpine flora of the Himalaya-Hengduan region, the phylogenetic reconstruction of the evolution of the biogeographical distribution range shows that the existing lineage appeared in the Early Oligocene and the diversified First Hengduan Mountains. In the early to middle Miocene, the accelerated diversification and colonization of neighboring areas may be driven by the intensification of the orogeny and the Asian monsoon. The Alpine flora of the Hengduan Mountains has been around for longer than any other alpine flora on earth, which illustrates how modern biota has been shaped by past geological and climatic events
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