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Issue: Vol. 728 No. 1: 11 Nov. 2025
Type: Article
Published: 2025-11-11
DOI: 10.11646/phytotaxa.728.1.6
Page range: 61-68
Abstract views: 232
PDF downloaded: 73

Grewia souladethiana, a new species of Malvaceae from 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
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
Kagoshima University Museum, Kagoshima University, 1-21-30, Korimoto, Kagoshima 890-0065, Japan
Faculty of Natural Science, National University of Laos, Dongdok Campus, Xaythany District, Vientiane Capital, Laos
Faculty of Environmental Sciences, National University of Laos, Dongdok Campus, Xaythany District, Vientiane Capital, Laos
Association for Community Development (ACD), Salavan Province, Laos
Faculty of Forest Science, National University of Laos, Dongdok Campus, Xaythany District, Vientiane Capital, Laos
Institute of Life Sciences, Vietnam Academy of Science and Technology, 85 Tran Quoc Toan Street, District 3, Ho Chi Minh City, Vietnam
Kagoshima University Museum, Kagoshima University, 1-21-30, Korimoto, Kagoshima 890-0065, Japan
Endemic flora Indochina limestones Malvales Eudicots

Abstract

Grewia souladethiana (Malvaceae-Grewioideae) is described and illustrated from Phou Hin Poun National Park, Khammouane Province, in central Laos. The new species grows at the edge of evergreen broad-leaved forest and in open grassland on the foot of limestone hills. To confirm the validity of the new species, diagnostic morphological characters were compared based on literature and herbarium materials at BKF, FOF, KAG an VNM as well as online digitized images. Morphologically it is similar to G. thailandica in having acuminate leaf apex, serrate leaf margin, and axillary inflorescences which are 2‒3-flowered and with erect peduncle, but distinguished by its tree habit, shorter petioles, smaller sepals and petals, and solitary or 2-lobed fruits. A description, photographs, line drawings, vernacular name and preliminary conservation status are provided for it, as well as a key to species of Grewia in Laos is provided.

References

  1. 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. ZooKeys 150: 117–126. Available from: https://geocat.iucnredlist.org/ (accessed 26 August 2025) https://doi.org/10.3897/zookeys.150.2109
  2. Beentje, H. (2012) The Kew Plant Glossary, an illustrated dictionary of plant terms, revised edition. The Royal Botanic Gardens, Kew, Richmond.
  3. Chantaranothai, P. & Nualngam, S. (2022) Two new species and a revised key of Grewia (Malvaceae) from Thailand. Thai Forest Bulletin (Botany) 50 (1): 1–8. https://doi.org/10.20531/tfb.2022.50.1.01
  4. Chung, R.C.K. (2005) Revision of Grewia (Malvaceae-Grewioideae) in Peninsular Malaysia and Borneo. Edinburgh Journal of Botany 62: 1–27. https://doi.org/10.1017/S0960428606000011
  5. Craib, W.G. (1911) Contributions of the Flora of Siam. II. List of Siamese plants with descriptions of new species. Bulletin of Miscellaneous Information, Royal Gardens, Kew 1911: 7–60.
  6. Gagnepain, F. (1910) Tiliacées. In: Lecomte, H. (Ed.) Flore générale de l’Indo-Chine Vol. 1. Masson et Cie, Paris, pp. 523–582.
  7. Gagnepain, F. (1945) Tiliacées. In: Lecomte, H. (Ed.) Flore générale de l’Indo-Chine Supplement. Masson et Cie, Paris, pp. 440–501.
  8. Ho, P.H. (1999) Cây cỏ Việt Nam: An illustrated flora of Vietnam, vol. 1. Youth Publication, Ho Chi Minh City.
  9. IUCN (2024) Guidelines for Using the IUCN Red List Categories and Criteria, version 16.
  10. Jussieu, A.L. (1804) Annales du Muséum National D’histoire Naturelle, 4. Chez Levrault, Schnoell et Compagnie, Libraries, Paris.
  11. Karimi, N. & Habesm, M.M. (2024) Patterns of Grewia (Malvaceae) diversity across geographical scales in Africa and Madagascar. Annals of Botany 33: 773–788. https://doi.org/10.1093/aob/mcae009
  12. Kurz, S. (1872) New Barmese plants. The journal of the Asiatic Society of Bengal 41 (2): 291–318.
  13. Laboratoire de phanérogamie (Muséum national d’histoire naturelle) (1909) Notulae systematicae (Vol. 1). J. Dumoulin.
  14. 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, Holmiae [Stockholm].
  15. Linnaeus, C. (1767) Mantissa Plantarum. generum editionis VI et specierum editionis II. Laurentii Salvii, Holmiae [Stockholm].
  16. 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.
  17. 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 from: https://padme.rbge.org.uk/laos/ (accessed 29 September 2024)
  18. Phengklai, C. (1993) Tiliaceae. In: Smitinand, T. & Larsen, K. (Eds.) Flora of Thailand 6 (1). The Forest Herbarium, Royal Forest Department, Bangkok, pp. 10–80.
  19. Pierre, J.B.A. (1888) Flore forestière de la Cochinchine Fasc. 10. O. Doin, Paris.
  20. POWO (2024) Plants of the World Online. Royal Botanic Gardens, Kew. Available from: http://www.plantsoftheworldonline.org/ (accessed 29 September 2024)
  21. Tang, Y., Gilbert, M.G. & Dorr, L.J. (2007) Tiliaceae. In: Wu, Z.Y., Raven, P.H. & Hong, D.Y. (Eds.) Flora of China 12. Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, pp. 240–263.
  22. Thiers, B.M. (2024) [continuously updated] Index Herbariorum. A global directory of public herbaria and associated staff. New York Botanical Garden’s Virtual Herbarium. Available from: https://sweetgum.nybg.org/science/ih/ (accessed 29 September 2024)
  23. Vahl, M. (1791) Symbolae botanicae, sive plantarum, tam earum, quas in itinere, imprimis orientali, collegit Petrus Forskål, quam aliarum, recentius detectarum, exactiores descriptiones, nec non observationes circa quasdam plantas dudum cognitas. Part 2. Impensis auctoris, excudebant Nicolaus Möller et filius, Hauniae [København].
  24. WFO (2024) Grewia L. World Flora Online. Published on the Internet, available from: http://www.worldfloraonline.org/taxon/wfo-4000016210/ (accessed 29 September 2024)

How to Cite

Phengmala, K., Tagane, S., Dang, V.-S., Kongxaisavath, D., Yamamoto, T., Souvannakhoummane, K., Phonepaseuth, P., Vongthavone, T., Sengthong, A., Trong, P.Q. & Yamazaki, K. (2025) Grewia souladethiana, a new species of Malvaceae from Laos. Phytotaxa 728 (1): 61–68. https://doi.org/10.11646/phytotaxa.728.1.6