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MODELLING THE DISTRIBUTION OF FIVE CARAGANA SPECIES IN TEMPERATE NORTHERN CHINA Geographical Distribution Pattern of Racomitrium(Grimmiaceae,Bryophyta) in the World and Its Evolutionary Significance Diversity differentiation of invasive plants at a regional scale in China and its influencing factors: accroding to analyses on the data from 74 regions A Brief Report on the Forest Vegetations in Baizha Region of Qinghai Province