A Taxonomic Revision Of Rhododendron subg. Tsutsusi sect. Brachycalyx (Ericaceae)1

@inproceedings{Xiaofeng2010ATR,
  title={A Taxonomic Revision Of Rhododendron subg. Tsutsusi sect. Brachycalyx (Ericaceae)1},
  author={Jing Xiao-feng and Ding Bing-yang and Zhang Yue-jiao and Hong De-yuan},
  year={2010}
}
Abstract Section Brachycalyx Sweet comprises nearly 30 species in Rhododendron L. subg. Tsutsusi (Sweet) Pojark. (Ericaceae) and is mainly distributed from China to Japan as well as eastern Asia. A taxonomic revision of section Brachycalyx is proposed and eight species with one subspecies are recognized. Rhododendron dilatatum Miq. var. decandrum Makino is newly recognized at the new rank of subspecies as R. dilatatum subsp. decandrum (Makino) X. F. Jin & B. Y. Ding. Lectotypes are designated… 
Contrasting diversification history between insular and continental species of three‐leaved azaleas (Rhododendron sect. Brachycalyx) in East Asia
TLDR
The rapid diversification in the insular species during the Quaternary may be a result of genetic drift due to population isolation and population decline on the islands, and widespread migration or colonization may have prevented allopatric speciation in the continental species.

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