Two new species, Begonia minhaniae and B. dieuanhiae (sect. Platycentrum, Begoniaceae), from northwestern Vietnam

THANH SON HOANG; CHE-WEI LIN

doi:10.11646/phytotaxa.572.1.6

Issue: Vol. 572 No. 1: 8 November 2022

Type: Article

Published: 2022-11-08

DOI: 10.11646/phytotaxa.572.1.6

Page range: 87-96

Abstract views: 26

PDF downloaded: 2

**Two new species, Begonia minhaniae and B. dieuanhiae (sect. Platycentrum, Begoniaceae), from northwestern Vietnam**

THANH SON HOANG⁺⁻
CHE-WEI LIN⁺⁻

Institute of Applied Technology, Thu Dau Mot University, Binh Duong province 820000, Vietnam

Herbarium of Taiwan Forestry Research Institute, Taiwan Forestry Research Institute, No. 53, Nan–Hai Road, Taipei 100, Taiwan

biodiversity endemism Indochina taxonomy Eudicots

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Abstract

Two novel species in Begonia sect. Platycentrum from northwestern Vietnam, B. minhaniae and B. dieuanhiae, are described and illustrated. Both species superficially resemble B. phouchomvoyensis in their rhizomatous habit, plain green ovary and leaves, 4-tepaled staminate flowers and 3-locular ovaries, but they can be clearly distinguished from the latter by several morphological characters such as morphology of vestiture, fewer anthers (those of B. minhaniae are ca. 15 vs. ca. 45 in B. phouchomvoyensis) and more tepals of pistillate flower (5 tepals in B. dieuanhiae vs. 3 tepals in B. phouchomvoyensis). These two novel discoveries highlight the growing body of research showing the rich and varied biodiversity of Begonia in the flora of Vietnam.

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