Abstract
Begonia trichopetiolata from Bukidnon, Central Mindanao, is described and illustrated as a new species endemic to the Philippines. It closely resembles B. mabuhayensis from Surigao del Sur, Eastern Mindanao; however, it differs in having triangular, keeled stipules, densely villose petioles, leaves with 10 primary veins and non-repand margin, shorter inflorescences and primary peduncles, larger bracts, and smaller capsules. Following IUCN Red List criteria, we propose B. trichopetiolata as Critically Endangered (CR). This discovery raises the total number of Begonia species in Bukidnon to 14 and marks the third member of Begonia section Baryandra recorded in the province.
References
- Amoroso, V.B., Lamparas, R.J.V., Lagunday, N.E., Dapar, M.L.G. & Rubite, R.R. (2023) Begonia fritschiana (Begoniaceae, Begonia section Baryandra), a new species from Quezon, Bukidnon, Philippines. Phytotaxa 587 (1): 39–46. https://doi.org/10.11646/phytotaxa.587.1.5
- Amoroso, V.B., Orias, P.J.F., Taer, E.C. & Montero, Y.P.M. (2026) A review of Philippine plant discoveries in the last 25 years. Journal for Nature Conservation 93: 127337. https://doi.org/10.1016/j.jnc.2026.127337
- Blasco, F.A., Alejandro, G.J.D. & Rubite, R.R. (2025) Begonia mabuhayensis (section Baryandra, Begoniaceae), a new species from Surigao del Sur, Philippines. Taiwania 70 (4): 591–594. [https://taiwania.ntu.edu.tw/pdf/tai.2025.70.591.pdf] https://doi.org/10.11646/phytotaxa.697.3.7
- Blasco, F.A., Alejandro, G.J.D., Tandang, D.N., Vales, M.B. & Rubite, R.R. (2022) Begonia amparoi (Begoniaceae, section Baryandra) a new species from Linungaw Twin Islands, Surigao del Sur, Mindanao, Philippines. Phytotaxa 549 (2): 136–140. https://doi.org/10.11646/phytotaxa.549.2.2
- Brown, R. (1810) On the Asclepiadeae. A Natural Order of Plants Separated from the Apocineae of Jussieu. Leiden, 67 pp.
- de Candolle, A. (1859) Mémoire sur la famille des Bégoniacées. [ser. 4.] Annales des Sciences Naturelles; Botanique 11: 128–129.
- Hughes, M., Moonlight, P.W., Jara-MunÞoz, A., Tebbitt, M.C., Wilson, H.P. & Pullan, M. (2015–present) Begonia Resource Centre. Available from: http://padme.rbge.org.uk/begonia/ (accessed 7 September 2026)
- IUCN Standards and Petitions Committee (2024) Guidelines for Using the IUCN Red List Categories and Criteria. Version 16. Prepared by the Standards and Petitions Committee. Available from: https://www.iucnredlist.org/resources/redlistguidelines (accessed 1 March 2026)
- Jussieu, A.L. (1806) Annales du Muséum d’histoire naturelle. G. Dufour, et Ed. d’Ocagne, 7: 76–77. [https://www.biodiversitylibrary.org/page/48531835]
- Klotzsch, J.F. (1854) Begoniaceen-Gattungen und Arten. Monatsberichte der Königlich preussischen Akademie der Wissenschaften zu Berlin 1854: 119–128.
- Klotzsch, J.F. (1855) Begoniaceen-Gattungen und Arten. Abhandlungen der Königlichen Akademie der Wissenschaften zu Berlin 1855: 121–125.
- Lamarck, J.B.P. (1786) Encyclopédie méthodique. Botanique. Panckoucke; Plomteux. 2: 1–774. [https://www.biodiversitylibrary.org/page/720860]
- Lindley, J. (1846) Edwards's botanical register; or, ornamental flower-garden and shrubbery: consisting of coloured figures of plants and shrubs, cultivated in british gardens; accompanied by their history, best method of treatment in cultivation, propagation. James Ridgway and Sons, Piccadilly, London, 32: 69 pp. [https://www.biodiversitylibrary.org/page/243402]
- Linnaeus, C. (1753) Species plantarum :exhibentes plantas rite cognitas, ad genera relatas, cum differentiis specificis, nominibus trivialibus, synonymis selectis, locis natalibus, secundum systema sexuale digestas. (Vol. 1). Impensis Laurentii Salvii. 1200 pp. [https://www.biodiversitylibrary.org/item/13829]
- Linnaeus, C. (1767) Car. a Linné Mantissa plantarum: Generum editionis VI. et specierum editionis II. Impensis Direct. Laurentii Salvii, 142 pp. [https://www.biodiversitylibrary.org/page/44260794]
- Linnaeus, C. (1771) Car. a Linné Mantissa plantarum altera: Generum editionis VI. et specierum editionis II. Impensis Direct. Laurentii Salvii, 588 pp. [https://www.biodiversitylibrary.org/page/42945416]
- Moritzi, A.L. (1846) Systematisches Verzeichniss Der Von H. Zollinger in Den Jahren 1842-1844 Auf Java Gesammelten Pflanzen. 166 pp.
- 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
- Muller Argoviensis, J. (1865) Euphorbiaceae. In: Garcke, A. & Schlechtendal, D.F.L. von. (Ed.) Linnaea: Ein Journal für die Botanik in ihrem ganzen Umfange, 34, pp. 196–224. [https://www.biodiversitylibrary.org/page/119854]
- Naive, M.A.K. & Cababan, M.A. (2021) Taxonomy of the genus Begonia (Begoniaceae) in Mindanao, Philippines I; Begonia olganunezae, a new Begonia section Petermannia species discovered in the province of Bukidnon. Taiwania 66 (4): 433–438. https://doi.org/10.6165/tai/2021.66.433
- Pelser, P.B., Barcelona, J.F. & Nickrent, D.L. (2011 onwards) Co’s Digital Flora of the Philippines. Available from: [https://www.philippineplants.org]
- Roxburgh, W. (1832) Flora indica. Parbury, Allen and Co., London, 875 pp. [https://www.biodiversitylibrary.org/item/10530]
- Rubite, R.R., Chung, K.-F. & Hughes, M. (2024) Begonia of the Philippines. KBCC Press, Taipei, Taiwan, 276 pp.