Begonia yentuensis and B. khaucaensis (Begoniaceae), two new species from northern Vietnam

HONG TRUONG LUU; QUOC HUNG DUONG; KHAC QUYET LE; CHE-WEI LIN

doi:10.11646/phytotaxa.560.2.5

Issue: Vol. 560 No. 2: 1 September 2022

Type: Article

Published: 2022-09-01

DOI: 10.11646/phytotaxa.560.2.5

Page range: 222-232

Abstract views: 34

PDF downloaded: 1

Begonia yentuensis and B. khaucaensis (Begoniaceae), two new species from northern Vietnam

HONG TRUONG LUU⁺⁻
QUOC HUNG DUONG⁺⁻
KHAC QUYET LE⁺⁻
CHE-WEI LIN⁺⁻

Southern Institute of Ecology, Institute of Applied Materials Science & Graduate University of Science and Technology, Vietnam Academy of Science and Technology, Ho Chi Minh City, Vietnam

Agriculture and Forestry University in Bacgiang, Vietyen District, Bacgiang Province, Vietnam

Fauna and Flora International, Vietnam Programme, Tay Ho, Ha Noi, Vietnam

Botanical Garden Division, Taiwan Forestry Research Institute, No. 53, Nan–Hai Road, Taipei 10066, Taiwan

biodiversity endemism taxonomy Eudicots

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Abstract

Two new species of Begonia from northern Vietnam, B. yentuensis and B. khaucaensis, are described. The first new species, B. yentuensis, is similar to B. asperifolia Irmsch., the two species share several characters such as tuberous habit, subsymmetric foliage, 4-tepaled staminate flowers and pistillate flowers with 5 tepals, but B. yentuensis is different in its shorter petioles up to 7 (vs. to 20) cm long and leaves nearly appressed to the substrate (vs. not appressed to substrate), filaments fused at base (vs. fused at base into a column ca. 2 mm long), anthers apex rounded (vs. acute to mucronate) and placentae unilamellate (vs. bilamellate). Moreover, B. asperifolia is found only at high elevations (1,500–3,400 m), while B. yentuensis was collected at a low elevation (ca. 500 m). The other new species, B. khaucaensis resembles B. jubar V.T.Pham & C.W.Lin in its rhizomatous habit, number of tepals of both staminate and pistillate flowers, ovary 3-loculed and placenta bilamellate, but differs from the latter for having hairy (vs. glabrous) stipules and petiole, suborbicular to reniform leaves (vs. ovate to widely ovate leaves, slightly polygonal in outline), bracts margin entire (vs. denticulate to serrate with very short soft hairs) and ovary wings crescent-shaped (vs. triangular).

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