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From Monotypic to Multispecies: Integrative Data Redefine Rheum nobile Complex (Polygonaceae) in Sky Island-Alpine Habitats
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DOI：10.1016/j.pld.2026.05.002.png)
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Abstract
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• Overturns the long-held view of Rheum nobile as a single species, revealing it to be a complex of four distinct species. • The four newly identified species correspond to four geographic regions: the Central Himalayas, Eastern Himalayas, Hengduan Mountains, and Gaoligong Mountains. • Reveals conflicting signals between nuclear and plastid genomes, indicating a complex evolutionary history involving gene flow. • Species delimitation is strongly supported by an integrative approach combining morphometrics, multi-locus DNA, and Bayesian coalescent-based analysis (BPP). • Provides a taxonomic revision of the group, including updated morphological descriptions for the four newly recognized species.
Keywords:
Rheum nobile
species delimitation
integrative taxonomy
Himalayas
gene flow
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