Lepidagathis (Acanthaceae) of Thailand: New Species and Updated Synopsis
DOI:
https://doi.org/10.20531/tfb.2026.54.2.07Keywords:
Lamiales, lectotype, new record, new species, taxonomyAbstract
In this synopsis of the genus Lepidagathis for the Flora of Thailand, nine species are recognized. This includes Lepidagathis argentea, a new species collected from limestone bedrock in Tak Province, and three species newly recorded for Thailand, L. dulcis, L. purpuricaulis and L. thorelii. Lepidagathis chiengmaiensis and L. thyrsiflora, are reduced to synonyms of L. incurva and L. fasciculata, respectively. The following names have been lectotypified: Lepidagathis chiengmaiensis, L. chlorostachya, L. dissimilis, L. dulcis, L. falcata and L. thorelii. A genus description with key to species, nomenclatural notes, distributional data and specimens examined are provided.
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References
Benoist, R. (1911). Les generes Lepidagathis et Lophostachys sont-lis distincts? Notulae Systematicae. Herbier du Muséum de Paris. Phanérogramie. Paris 2: 22–23.
Benoist, R. (1935). Acanthaceae. In: F. Gagnepain (ed.), Flora Générale de L’Indo-Chine 4: 610–772, Masson, Paris.
Bramhadande, S.P. & Nandikar, M.D. (2023). A synopsis of the genus Lepidagathis (Acanthaceae) in India, new taxa and notes on Dalzell’s species. Journal of Asia-Pacific Biodiversity 16: 626–653. https://doi.org/10.1016/j.japb.2023.08.004
Bremekamp, C.E.B. (1961). Lepidagathideae. In: Studies in the Flora of Thailand. Dansk Botanisk Arkiv Udgivet af Dansk Botanisk Forening 20(1): 72–75.
Bremekamp, C.E.B. (1965). Acanthaceae. In: Studies in the Flora of Thailand 32. Dansk Botanisk Arkiv Udgivet af Dansk Botanisk Forening 23(2): 200–224.
Comito, R., Darbyshire, I., Kiel, C.A. & McDade, L.A. (2025). Next-generation sequencing sheds new light on a major lineage of Acanthaceae, clarifying previously uncertain relationships in Barlerieae. Taxon 74: 911–932. https://doi.org/10.1002/tax.13341
Craib, W.G. (1911). Contributions to the Flora of Siam II. List of Siamense plants, with description of new species. Bulletin of Miscellaneous Information Kew 1911(10): 385–448.
Deng, Y.F., Li, Z.Y., Wang, Q. & Peng, H. (2020). Lepidagathis. In: Hong, D.Y. (ed), Flora of Pan-Himalaya, vol. 46: 88–96. Science Press, Beijing. Cambridge University Press.
Fischer, C.E.C. (1932). The Köenig Collection in the Lund Herbarium. Bulletin of miscellaneous information (Royal Botanic Garden, Kew) 1932(2): 49–76. https://doi.org/10.2307/4113368
Hirao, Y.V., Monteiro, M.M. & Demarco, D. (2019). Structure and development of flowers in Lepidagathis and implications for systematics of the genus and floral evolution in Acanthaceae. Botanical Journal of the Linnean Society 189: 153–168. https://doi.org/10.1093/botlinnean/boy076
Hu, J.Q., Deng, Y.F. & Daniel, T.F. (2011). Lepidagathis. In: Wu, Z.Y, Raven, P. & Hong, D.Y. (eds.), Flora of China, vol. 19: 469–472. Science Press, Beijing & Missouri Botanical Garden Press, St. Louis.
Imlay, J.B. (1939). Contributions to the Flora of Siam LI. New and re-named Siamense Acanthaceae. Bulletin of Miscellaneous Information Kew 1939(3): 109–150. https://doi.org/10.2307/4111677
Kadam, S.K., Tamboli, A.S., Mane, R.N., Jangam, A.P., Yadav, S.R., Choo, Y-S. & Park, J.H. (2023). Molecular phylogeny and genetic diversity of some Lepidagathis species (Acanthaceae) based on nuclear and chloroplast regions. Plant Biosystems: 1–10. https://doi.org/10.1080/11263504.2023.2165557
Mabberley, D.J. (2017). Mabberley’s Plant-book, A portable dictionary of plants, their classification and uses, 4th edition. Cambridge University Press, Cambridge, United Kingdom.
Manzitto-Tripp, E.A., Darbyshire, I., Daniel, T., Keil, C.A. & McDade, L.A. (2022). Revised classification of Acanthaceae and worldwide dichotomous keys. Taxon 71(1): 103–153. https://doi.org/10.1002/tax.12600
McDade, L.A., Daniel, T.F. & Kiel, C.A. (2008). Toward a comprehensive understanding of phylogenetic relationships among Acanthaceae s.l. (Lamiales). American Journal of Botany 95(9): 1136–1152. https://doi.org/10.3732/ajb.0800096
Nees von Esenbeck, C.G.D. (1832). Lepidagathis. In: N. Wallich (ed.), Plantae Asia Rariores; or, Descriptions and figure of a select number of unpublished East Indian plants 3: 95–97. Richard Taylor, London.
Nees von Esenbeck, C.G.D. (1847). Acanthaceae. In: A.P. de Candolle (ed.), Prodromus Systemalis Naturalis Regni Vegetabilis 11: 46–519. Sumptibus Sociorum Treuttel & Würtz, Paris.
Pooma, R. & Suddee, S. (eds). (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. Kew: Royal Botanic Gardens. https://powo.science.kew.org/ (accessed 2 April 2025).
Thiers, B. (2025, continuously updated). Index Herbariorum: A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium. http://sweetgum. nybg.org/ih/ (accessed 30 April 2025).
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