A new species (Begoniagiganticaulis) of Begoniaceae from southern Xizang (Tibet) of China

Dai-Ke Tian; Wen-Guang Wang; Li-Na Dong; Yan Xiao; Min-Min Zheng; Bin-Jie Ge

doi:10.3897/phytokeys.187.75854

A new species (Begoniagiganticaulis) of Begoniaceae from southern Xizang (Tibet) of China

PhytoKeys. 2021 Dec 30:187:189-205. doi: 10.3897/phytokeys.187.75854. eCollection 2021.

Authors

Dai-Ke Tian^{1

2}, Wen-Guang Wang³, Li-Na Dong⁴, Yan Xiao^{1

2}, Min-Min Zheng^{1

2

5}, Bin-Jie Ge^{1

2}

Affiliations

¹ Shanghai Chenshan Plant Science Research Center, Chinese Academy of Sciences, 3888 Chenhua Road, Songjiang, Shanghai 201602, China Shanghai Chenshan Plant Science Research Center, Chinese Academy of Sciences Shanghai China.
² Shanghai Key Laboratory for Plant Functional Genomics and Resources, Shanghai Chenshan Botanical Garden, 3888 Chenhua Road, Songjiang, Shanghai 201602, China Shanghai Chenshan Botanical Garden Shanghai China.
³ Xishuangbanna Tropical Botanical Garden, Chinese Academy of Sciences, Mengla, 666303, Yunnan, China Xishuangbanna Tropical Botanical Garden Mengla China.
⁴ Guangxi Key Laboratory of Plant Conservation and Restoration Ecology in Karst Terrain, Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences, Guilin 541006, Guangxi, China Guangxi Institute of Botany, Guangxi Zhuang Autonomous Region and Chinese Academy of Sciences Guilin China.
⁵ University of Chinese Academy of Sciences, Beijing 10049, China University of Chinese Academy of Sciences Beijing China.

Abstract

Begoniagiganticaulis, a huge new species in Begoniasect.Platycentrum of Begoniaceae from southern Xizang (Tibet) of China, is described. Morphologically, it is mostly similar to B.longifolia and B.acetosella, but clearly differs from the former mainly by its dioecious and taller plants, sparse hairs on abaxial veins, longer inflorescence, unique shape of fruits, and differs from the latter mainly by its late and longer flowering time, 6-tepals of female flower and 3-loculed ovary. The phylogenetic analyses also support the separation of the new species from other taxa. Based on the current data, its conservation status is assigned to Endangered (B2a) according to the IUCN Red List Categories and Criteria.

Keywords: Conservation status; molecular evidence; morphology; southern Tibet; taxonomy.

Dai-Ke Tian, Wen-Guang Wang, Li-Na Dong, Yan Xiao, Min-Min Zheng, Bin-Jie Ge.

Grants and funding

National Natural Science Foundation of China (31570199, 31860048), the Second Tibetan Plateau Scientific Expedition and Research (STEP) Program (2019QZKK05020202), and Shanghai Administration Bureau of Landscape and City Appearance (G122416, G202401).