Phylogeography of Spiraea mongolica (Rosaceae) on the Qinghai-Tibetan Plateau and Adjacent Highlands Phylogeography of the widespread plant Ailanthus altissima (Simaroubaceae) in China indicated by three chloroplast DNA regions Simulation of Stipa purpurea distribution pattern on Tibetan Plateau based on MaxEnt model and GIS Phylogeographic insights of the lowland species Cheirolophus sempervirens in the southwestern Iberian Peninsula Geographic variation of chloroplast DNA in Platycarya strobilacea (Juglandaceae) Repeated Range Expansion and Glacial Endurance of Potentilla glabra (Rosaceae) in the Qinghai-Tibetan Plateau Glacial Refugia of Ginkgo biloba and Human Impact on Its Genetic Diversity: Evidence from Chloroplast DNA