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Issue: Vol. 443 No. 1: 18 May 2020
Type: Article
Published: 2020-05-18
DOI: 10.11646/phytotaxa.443.1.8
Page range: 92–100
Abstract views: 32
PDF downloaded: 2

Two new baccate species of Begonia sect. Platycentrum (Begoniaceae) from Vietnam

Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China. Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences, Yezin, Nay Pyi Taw 05282, Myanmar. Karst Conservation Initiative of Yunnan, Kunming 650201, Yunnan, China.
Center for Plant Conservation of Vietnam (CPC), Vietnam Union of Science and Technology Associations, 25/32 Lane 89, Lac Long Quan Rd., Hanoi, Vietnam.
Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China. Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences, Yezin, Nay Pyi Taw 05282, Myanmar. University of Chinese Academy of Sciences, Beijing 100049, China.
Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China. University of Chinese Academy of Sciences, Beijing 100049, China.
Center for Plant Conservation of Vietnam (CPC), Vietnam Union of Science and Technology Associations, 25/32 Lane 89, Lac Long Quan Rd., Hanoi, Vietnam.
Key Laboratory for Plant Diversity and Biogeography of East Asia, Kunming Institute of Botany, Chinese Academy of Sciences, Kunming 650201, China. Southeast Asia Biodiversity Research Institute, Chinese Academy of Sciences, Yezin, Nay Pyi Taw 05282, Myanmar. Karst Conservation Initiative of Yunnan, Kunming 650201, Yunnan, China.
Baccate fruit Begonia sect. Platycentrum ovary locule placentation Vietnam Eudicots

Abstract

In North Vietnam, two baccate new species of Begonia in Begoniaceae are described, viz. Begonia pendens and Begonia satelloides. The first new species differs from B. hahiepiana principally in its cylindrical petioles, pistillate flowers with obovate outer petals and lanceolate inner petals, and trigonous-ellipsoid fruits with 2.9‒3.4 length- to width ratio. The second new species differs from B. balansana mainly in the abaxially pubescent leaf surface, cylindrical petioles, broadly ovate leaves, and the fruits with wings. The two new species usually grow under dense non-limestone forests of tropical lowlands and valleys, and face a higher risk of extinction from tropical agricultural practices compared to those neighboring species growing on limestone hills.