Molecular phylogeny, recent radiation and evolution of gross morphology of the rhubarb genus Rheum (Polygonaceae) inferred from chloroplast DNA trnL-F sequences.

@article{Wang2005MolecularPR,
  title={Molecular phylogeny, recent radiation and evolution of gross morphology of the rhubarb genus Rheum (Polygonaceae) inferred from chloroplast DNA trnL-F sequences.},
  author={Ailan Wang and Meihua Yang and Jianquan Liu},
  journal={Annals of botany},
  year={2005},
  volume={96 3},
  pages={
          489-98
        }
}
BACKGROUND AND AIMS Rheum, a highly diversified genus with about 60 species, is mainly confined to the mountainous and desert regions of the Qinghai-Tibetan plateau and adjacent areas. This genus represents a good example of the extensive diversification of the temperate genera in the Qinghai-Tibetan plateau, in which the forces to drive diversification remain unknown. To date, the infrageneric classification of Rheum has been mainly based on morphological characters. However, it may have been… 
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The hypothesis that geological events may play important roles in driving biological diversification through continental radiation in the past is supported.
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TLDR
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Molecular phylogeography of four endemic Sagittaria species (Alismataceae) in the Sino‐Japanese Floristic Region of East Asia
TLDR
The findings contradict the hypothesis of Quaternary origins of the endemic Sagittaria spp and support the view that modern species in the Northern Hemisphere originated mostly during the Tertiary, and range expansion may have profoundly modified the current distribution ranges of Sagittarias in the Sino-Japanese Floristic Region.
Uniformity of karyotypes in Rheum (Polygonaceae), a species-rich genus in the Qinghai-Tibetan Plateau and adjacent regions
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The results suggest that kayotypic differentiation had contributed little to interspe-cifi c morphological divergence within this genus, however, polyploidy seems to have played an important role in driving its speciation and diversifi cation.
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