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Peng, C.-I., Yang, H.-A., Kono, Y., Jung, M.-J. and Nguyen, T.H. 2015.

Four new species of Begonia (Begoniaceae) from Vietnam: B. abbreviata, B. calciphila, B. sphenantheroides and B. tamdaoensis

. Phytotaxa. 222, 2 (Aug. 2015), 83–99. DOI:https://doi.org/10.11646/phytotaxa.222.2.1.