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Background  Current and historical events have both affected the current distribution patterns and intraspecific divergence of plants. While numerous studies have focused on the Qinghai-Tibetan Plateau (QTP), the impacts of such events on the flora of subtropical China remain poorly understood. Subtropical China is famous for its highly complex topography and the limited impact from glaciation during the Pleistocene; this may have resulted in a different genetic legacy for species in this region compared to fully glaciated areas.    Methodology/Principal Findings  We used plastid and nuclear DNA sequence data and distribution modeling to analyze the divergence patterns and demographic history of  Primula obconica  Hance, a widespread herbaceous montane species in subtropical China. The phylogenetic analysis revealed two major lineages (lineage A and lineage B), representing a west-east split into the Yunnan and Eastern groups, and the Sichuan and Central groups, respectively. The Eastern and Central groups comprised relatively new derived haplotypes. Nested Clade Analysis and Bayesian Skyline Plot analyses both indicated that  P. obconica  mainly experienced a gradual expansion of populations. In addition, the simulated distribution of  P. obconica  during the Last Glacial Maximum was slightly larger than its present-day distribution.    Conclusion/Significance  Our results are the first to identify a west-east migration of  P. obconica . The gradual expansion pattern and a larger potential distribution range in cold periods detected for  P. obconica  indicate that the population expansion of this species is consistent with the phalanx model. In addition, the current patterns of genetic differentiation have persisted as a result of the extensive environmental heterogeneity that exists in subtropical China.

Population Expanding with the Phalanx Model and Lineages Split by Environmental Heterogeneity: A Case Study of Primula obconica in Subtropical China