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: 42

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).

References

Averyanov, L.V., Nguyen, K.S., Maisak, T.V., Nguyen, H.T. & Nguyen, H.Q. (2019) Two new species of Begonia L. (Begoniaceae) from central Laos. Turczaninowia 22 (2): 134–141. https://doi.org/10.14258/turczaninowia.22.2.9
Chen, W.H., Radbouchoom, S., Nguyen, H.Q., Nguyen, H.T., Nguyen, K.S. & Shui, Y.M. (2018) Seven new species of Begonia (Begoniaceae) in Northern Vietnam and Southern China. Phytokeys 94: 65–85. https://doi.org/10.3897/phytokeys.94.23248
Doorenbos, J., Sosef, M.S.M. & Wilde, J.J.F.E. (1998) The sections of Begonia. Wageningen Agricultural University, Wageningen, 66 pp.
Gagnepain, M.F. (1919) Nouveaux Begonia D’Asie; quelques synonymes (Suite). Bulletin du Muséum National d’Histoire Naturelle 25 (4): 276–283.
Hance, H.F. (1883) Three new chinese begonias. Journal of Botany 21: 202–203.
Hughes, M., Moonlight, P.W., Jara, A. & Pullan, M. (2015) Begonia Resource Centre. Available from: http://padme.rbge.org.uk/begonia (accessed 20 August 2021).
Irmscher, E. (1927) Beitrage zur kenntnis der ostasiatischen Begonien. Mitteilungen aus dem Institut für allgemeine Botanik in Hamburg 6 (3): 343–360.
IUCN Standards and Petitions Committee. (2022) Guidelines for Using the IUCN Red List Categories and Criteria. Version 15 (January 2022). Prepared by the Standards and Petitions Committee. Available from: http://www.iucnredlist.org/ (accessed 10 July 2022)
Léveillé, H. (1904) Bouquet de Fleurs de Chine. Bulletin de la Société d’Agriculture, Sciences et Arts de la Sarthe 39: 316–326.
Li, H.Z., Guan, K.Y., Lin, C.W. & Peng, C.-I (2018) Begonia qingchengshanensis (sect. Reichenheimia, Begoniaceae), a new species from Sichuan, China. Phytotaxa 349 (2): 197–200. https://doi.org/10.11646/phytotaxa.349.2.12
Lin, C.W., Phan, L.C.S. & Nguyen, N.H. (2021) Begonia rigidifolia ssp. sonhungii (sect. Petermannia, Begoniaceae), a new subspecies from limestone hills in Central Vietnam. Phytotaxa 498 (2): 139–144. https://doi.org/10.11646/phytotaxa.498.2.7
Liu, Y., Tseng, Y.H., Yang, H.A., Hu, A.Q., Xu, W.B., Lin, C.W., Kono, Y., Chang, C.C., Peng, C.-I & Chung, K.F. (2020) Six new species of Begonia from Guangxi, China. Botanical Studies 61: 21. https://doi.org/10.1186/s40529-020-00298-y
Moonlight, P.W., Ardi, W.H., Padilla, L.A., Chung, K.F., Fuller, D., Girmansyah, D., Hollands, R., Jara-Muñoz, A., Kiew, R., Leong, W.C., Liu, Y., Mahardika, A., Marasinghe, L.D.K., O’Connor, M., Peng, C.-I, Pérez, Á.J., Phuttai, T., Pullan, M., Rajbhandary, S., Reynel, C., Rubite, R.R., Julia, S., Scherberich, D., Shui, Y.M., Tebbitt, M.C., Thomas, D.C., Wilson, H.P., Zaini, N.H. & Hughes, M. (2018) Dividing and conquering the fastest-growing genus: Towards a natural sectional classification of the mega-diverse genus Begonia (Begoniaceae). Taxon 67: 267–323. https://doi.org/10.12705/672.3
Pham, V.T., Trinh, N.B., Phan, K.L. & Lin, C.W. (2019) Two new species, Begonia dinhdui and B. bacmeensis (Begoniaceae), from Vietnam. Phytotaxa 427 (1): 22–30. https://doi.org/10.11646/phytotaxa.427.1.3
Pham, V.T., Dinh, Q.D., Nguyen, V.C., Trinh, N.B., Nguyen, D.D., Nguyen, T.H. & Lin, C.W. (2021) Begonia of Vietnam: an updated checklist, including a new species and a new record. Phytotaxa 507 (2): 144–154. https://doi.org/10.11646/phytotaxa.507.2.2
Shui, Y.M., Chen, W.H., Peng, H., Huang, S.H. & Liu, Z.W. (2019) Taxonomy of Begonias. Yunnan Science and Technology Press, Kunming. 468 pp.