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Issue: Vol. 674 No. 3: 28 Nov. 2024
Type: Article
Published: 2024-11-28
DOI: 10.11646/phytotaxa.674.3.5
Page range: 281-287
Abstract views: 80
PDF downloaded: 4

Begonia triquetra (sect. Platycentrum, Begoniaceae), a new subpeltate-leaved species from limestone hills in Son La province, Northwestern Vietnam

Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi-10072, Vietnam
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi-10072, Vietnam. Institute of Regional Research and Development, Ministry of Science and Technology, No. 70, Tran Hung Dao, Hoan Kiem District, Hanoi, Vietnam.
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi-10072, Vietnam. Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi-10072, Vietnam.
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi-10072, Vietnam. Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi-10072, Vietnam.
Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi-10072, Vietnam
Mien Trung Institute for Scientific Research, Vietnam National Museum of Nature, Vietnam Academy of Science and Technology, 321 Huynh Thuc Khang street, Thua Thien Hue, Vietnam
Graduate University of Science and Technology, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi-10072, Vietnam. Institute of Ecology and Biological Resources, Vietnam Academy of Science and Technology, 18 Hoang Quoc Viet, Cau Giay, Hanoi-10072, Vietnam.
Herbarium of Taiwan Forestry Research Institute, Taiwan Forestry Research Institute, No. 53, Nan-Hai Road, Taipei 100, Taiwan
biodiversity endemism Indochina plant conservation taxonomy Eudicots

Abstract

Begonia triquetra, a new species endemic to the limestone karst regions of Son La province in Northwestern Vietnam, is described and illustrated here. This new species resembles B. xenos in its suberect habit, subpeltate lamina, 4-tepaled staminate flowers, and 2-locular ovary. However, B. triquetra differs significantly from B. xenos in having triangular (vs. terete) cross section of petiole, entire (vs. slightly crenulate) staminate tepals, and zygomorphic (vs. actinomorphic) androecium with 18–24 (vs. 52–85) stamens. Notes on ecology and conservation status are preliminarily provided to the new species.

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