Abstract
Begonia ngocbonii, a new species from North Vietnam is here described and illustrated. It resembles B. pellionioides Y.M.Shui & W.H.Chen, but is distinguishable by its hairy (vs. glabrous) stem, shorter inflorescence up to 1 cm (vs. ca. 5 cm or longer), 2-tepaled staminate and pistillate flowers (vs. 4-tepaled staminate flowers and 5-tepaled pistillate flowers), glabrous tepals (vs. spiny pilose on abaxial surface of outer tepals) and unilamellate placenta (vs. bilamellate).
References
Dong, W.K., Li, J.X., Chen, W.H., Xiao, B. & Shui, Y.M. (2021) Begonia caryotarum (Begonia sect. Platycentrum), a new species from southeast Yunnan, China. Phytotaxa 529 (1): 113–118. https://doi.org/10.11646/phytotaxa.529.1.9
Hughes, M., Moonlight, P.W., Jara-Muñoz, A., Tebbitt, M.C., Wilson, H.P. & Pullan, M. (2015–Present) Begonia Resource Center. Online database available from: http://padme.rbge.org.uk/begonia/ (accessed 1 Mar 2022)
IUCN Standards and Petitions Subcommittee (2019) Guidelines for Using the IUCN Red List Categories and Criteria, Version 14. Prepared by the Standards and Petitions Subcommittee. [https://www.iucnredlist.org/resources/redlistguidelines]
Lin, C.W., Hsu, T.C., Luu, H.T., Nguyen, I.L.P.T., Yang, T.Y.A. & Li, C.W. (2021a) Revision of Begonia (Begoniaceae) in Bidoup-Nui Ba National Park, Southern Vietnam, including two new species. Phytotaxa 496 (1): 77–89. https://doi.org/10.11646/phytotaxa.496.1.4
Lin, C.W., Phan, L.C.S. & Nguyen, N.H. (2021b) Begonia rigidifolia ssp. sonhungii (sect. Petermannia, Begoniaceae), a new subspecies from limestone hills in Central Vietnam. Phytotaxa 498 (2): 139–144. https://dx.doi.org/10.11646/phytotaxa.427.1.3
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., Sang, J., 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://dx.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
Radbouchoom, S., Chen, W.H., Guo, S.W., Nguyen, H.Q., Nguyen, S.K., Nguyen, H.T. & Shui, Y.M. (2019) Two new peltate-leaved species of Begonia L. (Begoniaceae) from northern Vietnam. Phytotaxa 407 (1): 71–78. https://dx.doi.org/10.11646/phytotaxa.407.1.10
Shui, Y.M., Chen, W.H., Peng, H., Huang, S.H. & Liu, Z.W. (2019a) Taxonomy of Begonias. Yunnan Science and Technology Press, Kunming. 468 pp.
Shui, Y.M., Vu, C.T., Le, T.A., Pham, T.T.D., Nguyen, V.D., Duong, T.M.H. & Lei, L.G. (2019b) Two new cane-like species of Begonia L. (Begoniaceae) from central Vietnam. Phytotaxa 411 (1): 57–64. https://doi.org/10.11646/phytotaxa.411.1.5
Souvannakhoummane, K., Hughes, M. & Lanorsavanh, S. (2016) Begonia lamxayiana Souvann. (Begoniaceae): a new species from Laos. Thai Journal of Botany 8 (1): 1–5.
Thomas, D.C., Hughes, M., Phutthai, T., Rajbhandary, S., Rubite, R., Ardi, W.H. & Richardson, J.E. (2011) A non-coding plastid DNA phylogeny of Asian Begonia (Begoniaceae): Evidence for morphological homoplasy and sectional polyphyly. Molecular Phylogenetics and Evolution 60: 428–444. https://doi.org/10.1016/j.ympev.2011.05.006
Wang, J., Chen, W.H., Hughes, M., Yang, Z.Z. & Shui, Y.M. (2015) Additional Notes on the Begonia Sect. Petermannia (Begoniaceae) from China. Plant Diversity and Resources 37 (5): 563–568.
Hughes, M., Moonlight, P.W., Jara-Muñoz, A., Tebbitt, M.C., Wilson, H.P. & Pullan, M. (2015–Present) Begonia Resource Center. Online database available from: http://padme.rbge.org.uk/begonia/ (accessed 1 Mar 2022)
IUCN Standards and Petitions Subcommittee (2019) Guidelines for Using the IUCN Red List Categories and Criteria, Version 14. Prepared by the Standards and Petitions Subcommittee. [https://www.iucnredlist.org/resources/redlistguidelines]
Lin, C.W., Hsu, T.C., Luu, H.T., Nguyen, I.L.P.T., Yang, T.Y.A. & Li, C.W. (2021a) Revision of Begonia (Begoniaceae) in Bidoup-Nui Ba National Park, Southern Vietnam, including two new species. Phytotaxa 496 (1): 77–89. https://doi.org/10.11646/phytotaxa.496.1.4
Lin, C.W., Phan, L.C.S. & Nguyen, N.H. (2021b) Begonia rigidifolia ssp. sonhungii (sect. Petermannia, Begoniaceae), a new subspecies from limestone hills in Central Vietnam. Phytotaxa 498 (2): 139–144. https://dx.doi.org/10.11646/phytotaxa.427.1.3
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., Sang, J., 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://dx.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
Radbouchoom, S., Chen, W.H., Guo, S.W., Nguyen, H.Q., Nguyen, S.K., Nguyen, H.T. & Shui, Y.M. (2019) Two new peltate-leaved species of Begonia L. (Begoniaceae) from northern Vietnam. Phytotaxa 407 (1): 71–78. https://dx.doi.org/10.11646/phytotaxa.407.1.10
Shui, Y.M., Chen, W.H., Peng, H., Huang, S.H. & Liu, Z.W. (2019a) Taxonomy of Begonias. Yunnan Science and Technology Press, Kunming. 468 pp.
Shui, Y.M., Vu, C.T., Le, T.A., Pham, T.T.D., Nguyen, V.D., Duong, T.M.H. & Lei, L.G. (2019b) Two new cane-like species of Begonia L. (Begoniaceae) from central Vietnam. Phytotaxa 411 (1): 57–64. https://doi.org/10.11646/phytotaxa.411.1.5
Souvannakhoummane, K., Hughes, M. & Lanorsavanh, S. (2016) Begonia lamxayiana Souvann. (Begoniaceae): a new species from Laos. Thai Journal of Botany 8 (1): 1–5.
Thomas, D.C., Hughes, M., Phutthai, T., Rajbhandary, S., Rubite, R., Ardi, W.H. & Richardson, J.E. (2011) A non-coding plastid DNA phylogeny of Asian Begonia (Begoniaceae): Evidence for morphological homoplasy and sectional polyphyly. Molecular Phylogenetics and Evolution 60: 428–444. https://doi.org/10.1016/j.ympev.2011.05.006
Wang, J., Chen, W.H., Hughes, M., Yang, Z.Z. & Shui, Y.M. (2015) Additional Notes on the Begonia Sect. Petermannia (Begoniaceae) from China. Plant Diversity and Resources 37 (5): 563–568.