Abstract
Begonia datii, a new species of B. sect. Coelocentrum from Central Vietnam is described. It resembles B. filiformis in its habit, leaf shape and texture, but it can be easily distinguished from the latter by its peduncle and inflorescence covered with villous hairs (vs. glandular-hispid), bracts caducous (vs. persistent or semi-persistent), tepals pinkish-white to pink (vs. yellowish-green), glabrous outer tepals of pistillate flowers (vs. glandular-hispid abaxially), ovary and wings glabrous (vs. glandular-hispid). Also, the two species can be clearly separated by geographical distributions: Begonia datii occurs only in Quang Binh Province, where is separated from the nearest known population of B. filiformis by ca. 450 km in southwestern Guangxi of China.
References
- Hughes, M., Moonlight, P.W., Jara-Muñoz, A., Tebbitt, M.C., Wilson, H.P. & Pullan, M. (2015) Begonia Resource Center. Available from: http://padme.rbge.org.uk/begonia/ (accessed 7 January 2023)
- Irmscher, E. (1939) Die Begoniaceen Chinas und ihre Bedeutung für die Frage der Formbildung in polymorphen Sippen. Mitteilungen aus dem Institut für allgemeine Botanik in Hamburg 10: 431–557.
- IUCN (2020) Standards and Petitions Committee. 2019. 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 7 January 2023)
- Léveillé, H. (1909) Decades plantarum novarum XVI, in Fedde. Repertorium Specierum No-varum Regni Vegetabilis 7 (1–3): 20–23. https://doi.org/10.1002/fedr.19090070108
- Liu, Y., Ku, S.M. & Peng, C.-I. (2007) Begonia bamaensis (sect. Coelocentrum, Begoniaceae), a new species from limestone areas in Guangxi, China. Botanical Studies 48: 465–473.
- 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, A.J., Phutthai, 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
- Nguyen, X.D., Nguyen, T.H., Nguyen, Q.D. & Nguyen, X.N. (Eds.) (2016) Biodiversity in Phong Nha-Ke Bang and Hin Nam No. The Nature Conservation and Sustainable Natural Resource Management in Phong Nha—Ke Bang National Park Region Project, Quang Binh Province, Vietnam, 87 pp.
- Peng, C.-I., Lin, C.W., Yang, H.A., Kono, Y. & Nguyen, H.Q. (2015) Six new species of Begonia (Begoniaceae) from limestone areas in Northern Vietnam. Botanical Studies 56: e9. https://doi.org/10.1186/s40529-015-0089-3
- 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.
- Shui, Y.M. & Chen, W.H. (2005) New Data of Sect. Coelocentrum (Begonia) in Begoniaceae. Acta Botanica Yunnanica 27 (4): 355–374.