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Issue: Vol. 737 No. 1: 7 Jan. 2026
Type: Article
Published: 2026-01-07
DOI: 10.11646/phytotaxa.737.1.1
Page range: 1-16
Abstract views: 94
PDF downloaded: 109

Two new species of Araliaceae from the limestone karst of Central Laos

Faculty of Forest Science, National University of Laos, Dongdok Campus, Xaythany District, Vientiane Capital, Laos
Kagoshima University Museum, Kagoshima University, 1-21-30, Korimoto, Kagoshima 890-0065, Japan
Kagoshima University Museum, Kagoshima University, 1-21-30, Korimoto, Kagoshima 890-0065, Japan
Faculty of Environmental Sciences, National University of Laos, Dongdok Campus, Xaythany District, Vientiane Capital, Laos; Department of Biological Sciences, Graduate School of Science, Tokyo Metropolitan University, 1-1 Minamiosawa, Hachioji, Tokyo 192-0397, Japan
Institute of Life Sciences, Vietnam Academy of Science and Technology, 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, Vietnam
Faculty of Forest Science, National University of Laos, Dongdok Campus, Xaythany District, Vientiane Capital, Laos
Apiales endemic species flora Indochina phylogeny taxonomy Eudicots

Abstract

Two new species of Araliaceae, Heptapleurum karsticola and Trevesia laotica, are described from limestone karst in central Laos. Heptapleurum karsticola was found in Khammouane Province, and the second species, T. laotica, was found in Bolikhamxai and Khammouane Provinces. Information regarding the distribution, habitat, phenology, vernacular names, preliminary conservation assessment, DNA barcodes, and taxonomic notes compared to other closely related species is provided for each species.

References

  1. Ai, T. (2018) Medicinal Flora of China, Zhongguo Yaoyong Zhiwuzhi (Diqijuan). Peking University Medical Press, Beijing, 1344 pp. [in Chinese]
  2. Bachman, S., Moat, J., Hill, A.W., de la Torre, J. & Scott, B. (2011) Supporting Red List threat assessments with GeoCAT: geospatial conservation assessment tool. Available from: https://geocat.iucnredlist.org/ (accessed 4 April 2025)
  3. Clement, W.L., Tebbitt, M.C., Forrest, L.L., Blair, J.E., Brouillet, L., Eriksson, T. & Swensen, S.M. (2004) Phylogenetic position and biogeography of Hillebrandia sandwicensis (Begoniaceae): a rare Hawaiian relict. American Journal of Botany 91: 905–917.
  4. Craib, W.G. (1930) Contributions to the Flora of Siam. Additamentum XXIX. Bulletin of Miscellaneous Information Kew 1930: 405–427.
  5. Decaisne, J. & Planchon, J.E. (1854) Esquisse d’une monographie des Araliacées. Revue Horticole, Séries 4 3: 104–109.
  6. de Kok, R.P.J. (2022) The Araliaceae of Peninsular Malaysia: five new species, two neotypifications and twenty-two lectotypifications in several genera. Gardens’ Bulletin Singapore 74: 71–90. https://doi.org/10.26492/gbs74(1).2022-06
  7. Doyle, J.J. & Doyle, J.L. (1987) A rapid isolation procedure for small quantities of fresh leaf tissue. Phytochemical Bulletin 19: 11–15.
  8. Engler, A. (1897) Die Natürlichen Pflanzenfamilien. Nachträge zum II. bis IV, Teil 1. Engelmann, Leipzig, pp. 1–380.
  9. Esser, H.-J. (2018) A new species of Brassaiopsis (Araliaceae) from Thailand and lectotypifications of names for related taxa. Thai Forest Bulletin (Botany) 46: 129–133. https://doi.org/10.20531/tfb.2018.46.2.03
  10. Esser, H.-J. (2021) Schefflera (Araliaceae) in Thailand becomes Heptapleurum. Thai Forest Bulletin (Botany) 49: 151–154. https://doi.org/10.20531/tfb.2021.49.1.19
  11. Esser, H.-J. & Jebb, M.H.P. (2010) A new Schefflera and taxonomic notes on Araliaceae from Thailand. Thai Forest Bulletin (Botany) 38: 160–166.
  12. Esser, H.-J. & Jebb, M.H.P. (2019) Araliaceae. In: Chayamarit, K. & Balslev, H. (Eds.) Flora of Thailand 14 (2). Forest Herbarium, Department of National Parks, Wildlife and Plant Conservation, pp. 185–251.
  13. Forster, J.R. & Forster, G. (1776) Characteres generum plantarum ed. 2. B. White, B., Cadell, T. & Elmsley, P., London, 150 pp.
  14. Gaertner, J. (1791) De fructibus et seminibus plantarum 2 (3). G.H. Schramm, Tübingen, pp. 353–504.
  15. Gamble, J.S. (1919) XII. Decades Kewenses. Plantarum novarum in herbario Horti Regii conservatarum. Decades XCII. & XCIII. Bulletin of Miscellaneous Information 1919: 221–233.
  16. Grushvitzky, I.V., Skortsova, N.T., Arkhangelsky, D.B. & Chistyakova, L.D. (1984) The species of the genus Trevesia (Araliaceae) in the flora of Vietnam. Botanicheskii Zhurnal 69: 1019–1029.
  17. Hayata, B. (1916) Icones Plantarum Formosanarum 6. Government of Formosa, Taihoku, pp. 1–168, pl. 1–20.
  18. Hoang, D.T., Chernomor, O., Von Haeseler, A., Minh, B.Q. & Vinh, L.S. (2018) UFBoot2: improving the ultrafast bootstrap approximation. Molecular Biology and Evolution 35: 518–522. https://doi.org/10.1093/molbev/msx281
  19. Hoo, G. & Tseng, C.J. (1978) Araliaceae. In: Editorial Committee of FRPS (Ed.) Flora Reipublicae Popularis Sinicae 54. Science Press, Beijing, pp. 1–188.
  20. IUCN (2024) Guidelines for using the IUCN Red List categories and criteria, version 16. Prepared by the IUCN Standards and Petitions Committee. Available from: https://www.iucnredlist.org/documents/RedListGuidelines.pdf (accessed 8 April 2025)
  21. Jebb, M.H.P. (1998) A revision of the genus Trevesia (Araliaceae). Glasra 3: 85–113.
  22. Katoh, K., Rozewicki, J. & Yamada, K.D. (2019) MAFFT online service: multiple sequence alignment, interactive sequence choice and visualization. Briefings in Bioinformatics 20: 1160–1166. https://doi.org/10.1093/bib/bbx108
  23. Koch, K.H.E. (1859a) Ueber einige Araliaceen. Wochenschrift für Gärtnerei und Pflanzenkunde 2: 66–71.
  24. Koch, K.H.E. (1859b) Die Araliaceen im Allgemeinen und Aufzählung der in den Gärten kultivierten Arten. Wochenschrift für Gärtnerei und Pflanzenkunde 2: 371–372.
  25. Lamarck, J.B.A.P. de M. (1788) Encyclopédie méthodique, Botanique 2. Panckoucke, Paris, 774 pp.
  26. Larsson, A. (2014) AliView: a fast and lightweight alignment viewer and editor for large datasets. Bioinformatizcs 30: 3276–3278.
  27. Letunic, I. & Bork, P. (2021) Interactive Tree of Life (iTOL) v5: an online tool for phylogenetic tree display and annotation, Nucleic Acids Research 49: W293–W296. https://doi.org/10.1093/nar/gkab301
  28. Li, H.L. (1942) The Araliaceae of China. Sargentia 2: 1–134.
  29. Li, H.L. (1949) A new genus of the Araliaceae. Journal of the Arnold Arboretum 30: 231–232.
  30. Li, R. & Wen, J. (2013) Phylogeny and biogeography of Dendropanax (Araliaceae), a genus disjunct between tropical/subtropical Asia and the Neotropics. Systematic Botany 38: 536–551. https://doi.org/10.2307/25065918
  31. Li, R. & Wen, J. (2014) Phylogeny and biogeography of Asian Schefflera (Araliaceae) based on nuclear and plastid DNA sequence data. Journal of Systematics and Evolution 52: 397–539. https://doi.org/10.1111/jse.12052
  32. Li, R. & Wen, J. (2016) Phylogeny and diversification of Chinese Araliaceae based on nuclear and plastid DNA sequence data. Journal of Systematics and Evolution 54 (4): 453–467. https://doi.org/10.1111/jse12196
  33. Lindley, J. (1825) Gastonia palmata. The Botanical Register 11: t. 894.
  34. Linnaeus, C. (1753) Species Plantarum. L. Salvius, Stockholm, 1200 pp.
  35. Lowry II, P.P. & Plunkett, G.M. (2020) Resurrection of the genus Heptapleurum for the Asian clade of species previously included in Schefflera (Araliaceae). Novon 28: 143–170. https://doi.org/10.3417/2020612
  36. Makino, T. (1900) Plantae Japonenses novae vel minus cognitae. The Botanical Magazine Tokyo 14: 31–34.
  37. Maximowicz, C.J. (1859) Primitiae florae Amurensis. Kaiserliche Akademie der Wissenschaften, St. Petersbourg, 504 pp.
  38. Merrill, E.D. (1924) New species of plants from Indo-China. University of California Publications in Botany 10: 423–430.
  39. Miquel, F.A.W. (1856) Araliacearum indicarum genera et species aliquot novae. Bonplandia 4: 137–139.
  40. Miquel, F.A.W. (1863) Araliaceae novae, adiecta aliarum specierum praesertim indicarum revisione. Annales Musei Botanici Lugduno-Batavi 1: 1–27.
  41. Newman, M.F., Ketphanh, S., Svengsuksa, B., Thomas, P., Sengdala, K., Lamxay, V. & Armstrong, K. (2007) A checklist of the vascular plants of Lao PDR. Royal Botanic Garden, Edinburgh, 400 pp.
  42. Newman, M.F., Pullan, M., Souladeth, P., Ketphanh, S., Svengsuksa, B., Thomas, P., Sengdala, K., Lamxay, V. & Armstrong, K. (2017–present) A checklist of the vascular plants of Lao PDR. Online database available at: https://padme.rbge.org.uk/laos/ (accessed 2 April 2025)
  43. Nguyen, L.T., Schmidt, H.A., von Haeseler, A. & Minh, B.Q. (2015) IQ-TREE: a fast and effective stochastic algorithm for estimating maximum-likelihood phylogenies. Molecular Biology and Evolution 32: 268–274. https://doi.org/10.1093/molbev/msu300
  44. Philipson, W.R. (1970) Constant and variable features of the Araliaceae. Botanical Journal of the Linnean Society 63: 87–100.
  45. Plunkett, G.M., Lowry II, P.P., Fiaschi, P., Frodin, D.G. & Nicolas, A.N. (2019) Phylogeny, biogeography, and morphological evolution among and within the Neotropical and Asian clades of Schefflera (Araliaceae). Taxon 68: 1149–1385. https://doi.org/10.1002/tax.12177
  46. Plunkett, G.M., Wen, J. & Lowry II, P.P. (2004) Infrafamilial classifications and characters in Araliaceae: Insights from the phylogenetic analysis of nuclear (ITS) and plastid (trnL-trnF) sequences data. Plant Systematics and Evolution 245: 1–39. https://doi.org/10.1007/s00606-003-0101-3
  47. POWO (2025) Plants of the World Online. Facilitated by the Royal Botanic Gardens, Kew. Available from: https://powo.science.kew.org/ (accessed 8 April 2025)
  48. Seemann, B. (1866) Revision of the natural order Hederaceae. Journal of Botany, British and Foreign 4: 293–299; 352–356.
  49. Shang, C.B. (1984) Le genre Schefflera (Araliacées) en Chine et Indochine. Candollea 39: 453–486. https://doi.org/10.5169/SEALS-879923
  50. Shang, C.B. (1997) Espèces nouvelles d'Araliaceae asiatiques. Adansonia, sér. 3 19: 77–83.
  51. Shang, C.B. & Lowry II, P.P. (2007) Araliaceae. In: Wu, Z.Y., Raven, P.H. & Hong, D.Y. (Eds.) Flora of China. Science Press, Beijing and Missouri Botanical Garden Press, St. Louis, pp. 435–491.
  52. Souvannakhoummane, K., Phonepaseuth, P., Souladeth, P., Lanorsavanh, S., Tagane, S. & Tanaka, N. (2025) Studies on the Gesneriaceae in Laos II: Lysionotus calcicola, a new species from limestone karsts in North and Central Laos, supported by morphological and molecular evidence. Nordic Journal of Botany 2025: e04620. https://doi.org/10.1002/njb.04620
  53. Tagane, S., Rueangruea, S., Suddee, S., Nagamasu, H., Naiki, A. & Toyama, H. (2017) Heteropanax thaiensis, a new species and Schefflera wrayi (Araliaceae), a new record to Thailand. Thai Forest Bulletin (Botany) 45: 99–104. https://doi.org/10.20531/tfb.2017.45.2.03
  54. Tagane, S., Toyama, H., Chhang, P., Nagamasu, H. & Yahara, T. (2015) Flora of Bokor National Park, Cambodia I: Thirteen new species and one change in status. Acta Phytotaxonomica et Geobotanica 66: 95–135. http://dx.doi.org/10.18942/apg.KJ00010001424
  55. Thunberg, C.P. (1780) Cussonia, novum plantae genus e promontorio bonae spei africes. Nova Acta Regiae Societatis Scientiarum Upsaliensis 3: 210–212.
  56. Torrey, J. & Gray, A. (1840) A Flora of North America. Wiley & Putnam, New York etc., pp. 545–711.
  57. Valcarcel, V., Fiz-Palacios, O. & Wen, J. (2014) The origin of the early differentiation of Ivies (Hedera L.) and the radiation of the Asian Palmate group (Araliaceae). Molecular Phylogenetics and Evolution 70: 492–503. https://doi.org/10.1016/j.ympev.2013.10.016
  58. Viguier, R. (1906) Recherches anatomiques sur la classification des Araliacées. Annales des Sciences Naturelles, Botanique 9 (4): 1–210.
  59. Viguier, R. (1909) Nouvelles recherches sur les Araliacées. Annales des Sciences Naturelles, Botanique 9 (9): 305–405.
  60. Visiani, R. de. (1842) Sopra La Gastonia palmata de W. Roxburgh proposta qual tipo di un nuovo genere nella famiglia delle Araliacee. Memorie della Reale Accademia delle Scienze di Torino 2 (4): 257–266.
  61. Wen, J., Lee, C., Lowry II, P.P. & Hiep, N.T. (2003) Inclusion of the Vietnamese endemic genus Grushvitzkya in Brassaiopsis (Araliaceae): evidence from nuclear ribosomal ITS and chloroplast ndhF sequences. Botanical Journal of the Linnean Society 142: 455–463. https://doi.org/10.1046/j.1095-8339.2003.00188.x
  62. Wen, J. & Lowry II, P.P. (2006) New species and new combination in Brassaiopsis (Araliaceae) from Vietnam and southern China. Adansonia sér. 3 28: 181–190.
  63. Wen, J., Lôc, P.K., Hiep, N.T., Regalado, J.J., Averyanov, L.V. & Lee, C. (2007) An unusual new species of Trevesia from Vietnam and its implications on generic delimitation in Araliaceae. Taxon 56: 1261–1268. https://doi.org/10.2307/25065918
  64. Wen, J., Plunkett, G.M., Mitchell, A.D. & Wagstaff, S.J. (2001) The evolution of Araliaceae: A phylogenetic analysis based on ITS sequences of nuclear ribosomal DNA. Systematic Botany 26: 144–167.
  65. Yi, T.S., Lowry II, P.P., Plunkett, G.M. & Wen, J. (2004) Chromosomal evolution in Araliaceae and close relatives. Taxon 53: 987–1005.

How to Cite

Kongxaisavath, D., Tagane, S., Yamamoto, T., Phonepaseuth, P., Dang, V.-S. & Souladeth, P. (2026) Two new species of Araliaceae from the limestone karst of Central Laos. Phytotaxa 737 (1): 1–16. https://doi.org/10.11646/phytotaxa.737.1.1