Pleistocene climate oscillations and topographic barriers jointly shape stepwise phylogeographic divergence and polygenic adaptation to isothermality in Bupleurum chinense - Yong-Xiu Song; Yi Shi; Jia-Qing Hou; Zhen Zhang; Xin-Yi Yu; Ying-Qi Zeng; Xiao-Yu Jiang; Yan Yu (Palaeogeography, Palaeoclimatology, Palaeoecology, 2026)