Differences in physiography have been proposed to explain the diversity anomaly for vascular plants between environmentally similar regions of eastern Asia (EAS) and eastern North America (ENA). Here, we use plant species within disjunct genera to examine whether differences in topography contribute to the diversity anomaly and whether the richness–environment relationships differ between regions. Disjunct plants are used to ensure that the diversity anomaly relates to post-disjunction evolution and diversification rather than regional differences in clade ages or immigration.

中文翻译：

---

气候和地形对东亚和北美东部间断分布的植物多样性异常的影响

已提出地貌差异来解释东亚 (EAS) 和北美东部 (ENA) 环境相似地区之间维管植物的多样性异常。在这里，我们使用分离属内的植物物种来检查地形差异是否导致多样性异常以及区域之间的丰富度 - 环境关系是否不同。分离植物用于确保多样性异常与分离后的进化和多样化有关，而不是与进化枝年龄或移民的区域差异有关。