The plant species sharing ancestors now disjunctly distributed in eastern Asia (EAS) and eastern North America (ENA) have long been a biogeographic puzzle. Species within the EAS–ENA disjunct genera are presumed to exhibit niche conservatism, the tendency of closely related species to be more ecologically similar, reflecting lineages’ common evolutionary history. However, the hypothesis has not been well examined at the species level.

中文翻译：

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生态位重叠和发散时间支持东亚-北美东部分离植物的生态位保守性

共享祖先的植物物种现在分散地分布在东亚 (EAS) 和北美东部 (ENA) 长期以来一直是一个生物地理难题。EAS-ENA 分离属内的物种被认为表现出生态位保守性，即密切相关的物种在生态上更加相似的趋势，反映了谱系的共同进化历史。然而，该假设尚未在物种水平上得到很好的检验。