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The phylogeographichistory oftwo closelyrelated species,Spiraea alpina and S.mongolica,were analysed across the Qinghai–Tibetan Plateau(QTP)before,during,and after the most recent glaciation or orogenic events using chloroplast DNA(cpDNA)and microsatellite data sets.Data were obtained by generating and analysing data sets for 851 individuals from 63 natural populations.