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Issue: Vol. 496 No. 1: 9 April 2021
Type: Article
Published: 2021-04-09
DOI: 10.11646/phytotaxa.496.1.4
Page range: 77–89
Abstract views: 18
PDF downloaded: 1

Revision of Begonia (Begoniaceae) in Bidoup-Nui Ba National Park, Southern Vietnam, including two new species

Botanical Garden Division, Taiwan Forestry Research Institute, Taipei 10066, Taiwan
Botanical Garden Division, Taiwan Forestry Research Institute, Taipei 10066, Taiwan Department of Life Sciences, National Chung Hsing University, Taichung 40227, Taiwan.
Southern Institute of Ecology & Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Ho Chi Minh City, Vietnam.
Research center of Bidoup Nui Ba National Park, Lac Duong, Lam Dong, Vietnam
Department of Life Sciences, National Chung Hsing University, Taichung 40227, Taiwan. Biology Department, National Museum of Natural Science, Taichung 40453, Taiwan.
Institute of Molecular and Cellular Biology, National Tsing Hua University, Hsinchu 30013, Taiwan Bioresource Conservation Research Center, College of Life Science, National Tsing Hua University, Hsinchu 30013, Taiwan
biodiversity endemism sect. Platycentrum taxonomy Eudicots

Abstract

The Begonia species occurring in Bidoup-Nui Ba National Park (Lam Dong Province, southern Vietnam) are reviewed based on recent floristic field surveys. Five species were recognized from the montane forests, and two of which are new to science. The new species belong to Begonia sect. Platycentrum and are named as B. hongiaoensis C.W.Lin, T.C.Hsu & Luu and B. lamdongiana C.W.Lin, T.C.Hsu & Luu, repectively. Begonia hongiaoensis most closely resembles B. siamensis Gagnep from northern Thailand. Both species have a rhizomatous habit and bear ovate leaves. However, the new species differs by its stoloniferous habit, shallowly cordate leaf base and 5-tepaled pistillate flowers. Begonia lamdongiana is similar to B. coelocentroides Y.M.Shui & Z.D.Wei, a hairy leaf species of the same section in Yunnan of China, but is markedly distinct in its glabrous petioles, inflorescences, pedicels and ovaries, and larger bracts.