A Revision of Brachylophon Oliv. (Malpighiaceae) Based on Morphology, Phylogenetics, and Palynology Reveals a New Species Endemic to Thailand
DOI:
https://doi.org/10.58837/tnh.25.8.266904Keywords:
Acridocarpeae, Endemic species, Flora of Thailand, Limestone, MalpighioideaeAbstract
We present a taxonomic revision of Brachylophon (Malpighiaceae) in Thailand, Southeast Asia, based on herbarium collections and a field trip conducted in 2024. Two previously accepted species, B. anatomosans Craib and B. curtisii Oliv., are reported, alongside the new species, B. sirindhorniae Chaisongkram & Ruchis., described and illustrated for the first time. The new species is characterized by having white petals, pedicels 2–5 mm long; filaments 1.5–2.5 mm long; and mericarp 6–7 mm long. A detailed description, illustrations, and a comparison with closely related species are provided to aid in its identification. The discovery of this new species highlights the ongoing need for further exploration and taxonomic study of the genus in Southeast Asia to fully understand its diversity and distribution.
References
Bachman, S., Moat, J., Hill, A.W., de la Torre, J. and Scott. B. 2011. Supporting Red List threat assessments with GeoCAT: geospatial conservation assessment tool. In: Smith, V., Penev, L. (Eds) e-Infrastructures for data publishing in biodiversity science. ZooKeys 150: 117–126. (Version BETA)*.
Beentje, H. 2016. The Kew plant glossary: an illustrated dictionary of plant terms. Second edition. Kew Publishing.
Chaisongkram, W., Tubtamat, M., Kulpholmuang, W. and Chanta-ranothai, P. 2022. Palynological studies and lectotypification of Malpighiaceae in Thailand. Tropical Natural History, 22(1): 108–118.
Craib, W.G. 1926. Contributions to the flora of Siam. Additamen-tum XVIII. Bulletin of Miscellaneous information (Royal Botanic Gardens, Kew), 4: 154–174.
Davis, C.C., Bell, C.D., Fritsch, P.W. and Mathews, S. 2002. Phylogeny of Acridocarpus-Brachylophon (Malpighiaceae): implycations for tertiary tropical floras and Afroasian biogeo-graphy. Evolution, 56: 2395–2405.
de Almeida R.F. and de Morais I.L. 2022. Morphology of Malpighiaceae from Brazil, Part 1. Universidade Estadual de Goiás, Quirinópolis, 44 pp.
de Almeida, R.F., de Morais, I.L., Alves-Silva, T., Antonio-Domingues, H. and Pellegrini, M.O.O. 2024. A new classifi-cation system and taxonomic synopsis for Malpighiaceae (Malpighiales, Rosids) based on molecular phylogenetics, morphology, palynology, and chemistry. PhytoKeys, 242: 69–138. https://doi.org/10.3897/phytokeys. 242.117469.
de Kok, R. 2024. Brachylophon curtisii. The IUCN Red List of Threa-tened Species 2024: e.T231526531A231918107. https:// dx.doi.org/10.2305/iucn.uk.2024-1.rlts.t231526531a231918 107.en. Accessed on 25 July 2025.
Erdtman, G. 1960. The acetolysis method: a revised description. Svensk Botanisk Tidskrift, 54: 561–564.
Erdtman, G. 1966. Pollen morphology and plant taxonomy: Angio-sperms. Hafner Publishing, New York, 553 pp.
Hesse, M., Halbrintter, H., Zetter, R., Weber, M., Buchner, R., Frosch-Radivo, A. and Ulrich, L.S. 2009. Pollen terminology: an illustrated handbook. Springer, Wien, 266 pp.
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. https:// www.iucnredlist.org/documents/RedListGuidelines.pdf.
Minh, B.Q., Schmidt, H.A., Chernomor, O., Schrempf, D., Woodhams, M.D., von Haeseler, A. and Lanfear, R. 2020. IQ-TREE 2: New Models and Efficient Methods for Phylogenetic Inference in the Genomic Era, Molecular Biology and Evo-lution, 37(5): 1530–1534. doi.org/10.1093/molbev/msaa015.
Miller, M., Pfeiffer, W. and Schwartz, T. 2010. Creating the CIPRES Science Gateway for inference of large phylogenetic trees. Gateway Computing Environments Workshop (GCE) 2010: 1–8. https://doi.org/10.1109/GCE.2010.5676129.
Office of the Forest Herbarium. 2014. Tem Smitinand’s Thai Plant Names, revised edition 2014. Office of the Forest Herbarium, Department of National Parks, Wildlife and Plant Conservation, Bangkok.
POWO. 2025. Plants of the World Online. Facilitated by the Royal Botanic Gardens, Kew. Published on the Internet; https:// powo.science.kew.org/ Retrieved 25 March 2025.
Punt, W., Hoen, P. P., Blackmore, S., Nilsson, S. and Le Thomas, A. 2007. Glossary of pollen and spore terminology. Review of Paleobotany and Palynology, 143: 1–81.
Rambaut, A. 2018. Figtree ver. 1.4.4. Institute of Evolutionary Biology, University of Edinburgh, Edinburgh.
Ronquist, F., Teslenko, M., Van der Mark, P., Ayres, D., Darling, A., Höhna, S., Larget, B.R., Liu, L., Suchard, M.A. and Huel-senbeck, J.P. 2012. MrBayes 3.2: efficient Bayesian phyloge-netic inference and model choice across a large model space. Systematic Biology, 61: 539–542. doi.org/10.1093/sysbio/ sys029.
Sirirugsa, P. 1991. The genus Brachylophon (Malpighiaceae) in Thailand. Thai Forest Bulletin (Botany), 19: 1–5.
Thompson, J.D., Higgins, D.G. and Gibson, T.J. 1994. CLUSTAL W improving the sensitivity of progressive multiple sequence alignment through sequence weighting, position-specific gap penalties and weight matrix choice. Nucleic Acids Research. 22(22): 4673–4680. doi:10.1093/nar/22.22.4673.
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