Published October 31, 2025
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Mallotus thinii (Euphorbiaceae), a new species discovered from the coastal areas of the south-central provinces of Vietnam
Authors/Creators
- 1. University of Science, Vietnam National University, Hanoi, Vietnam
- 2. Institute of Life Sciences, Vietnam Academy of Science and Technology, Ho Chi Minh, Vietnam
Description
Mallotus thinii Kim Thanh & V.S.Dang, a new species discovered in coastal areas of the south-central provinces of Vietnam, is described and illustrated here. This species is morphologically most similar to M. leptostachyus Hook.f. and M. peltatus (Geiseler) Müll.Arg. It can be distinguished from other Mallotus species previously known by its habitat on sandy soils close to the beach, shrubby habit, deciduous stipules, oblanceolate leaf blades, two larger extrafloral nectaries near the base or sometimes two to four more along the midrib, presence of a pistillode, and fruits without spines. A detailed description, color photographs, distribution, habitat, preliminary conservation assessment, and phylogenetic analysis are provided. Molecular phylogenetic analyses based on matK and ITS nucleotide sequences strongly confirm M. thinii as a distinct new species within Mallotus.
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References
- Airy Shaw HK (1968) Malesian and other Asiatic Euphorbiaceae. Kew Bulletin 21: 379–400. https://doi.org/10.2307/4107914
- Beentje H (2010) The Kew Plant Glossary: An Illustrated Dictionary of Plant Terms. Kew Royal Botanic Gardens, Kew.
- Dang VS, Yamamoto T, Nguyen QB, Pham QT, Truong BV, Nguyen TV, Souladeth P, Kongxaisavat D, Yamazaki K, Tagane S (2025) Two new species of Mallotus (Euphorbiaceae) from Vietnam. Taiwania 70(3): 439–444. https://taiwania.ntu.edu.tw/pdf/tai.2025.70.439.pdf
- Darriba D, Taboada GL, Doallo R, Posada D (2012) jModelTest 2: More models, new heuristics and parallel computing. Nature Methods 9(8): 772–772. https://doi.org/10.1038/nmeth.2109
- Gagnepain F (1925) Euphorbiaceae. In: MH Lecomte, Flore générale de l'Indo-Chine 5: 350–376. Masson & Cie, Paris.
- Hall TA (1999) BIOEDIT: a user-friendly biological sequence alignment editor and analysis program for Windows 95/98/ NT. Nucleic Acids Symposium Series: 41.
- Ho PH (1999) An Illustrated Flora of Vietnam. 2: 248–256. [Youth Publ. House, Hanoi, Vietnam.]
- IUCN (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 [accessed 8 April 2025]
- Kiu HS, Gilbert MG (2008) Mallotus. In: Wu ZY, Raven PH, Hong DY (Eds) Flora of China, vol 11. Science Press, Beijing & Missouri Botanical Garden Press, St. Louis, 225–237.
- Liu D, Coloe S, Baird R, Pederson J (2000) Rapid mini-preparation of fungal DNA for PCR. Journal of Clinical Microbiology 38(1): 471. https://doi.org/10.1128/jcm.38.1.471-471.2000
- Loureiro J (1790) Flora Cochinchinensis 1: 633–635. [J. de Loureiro, Ulyssipone] [Lisboa]
- Nguyen TKT, Nguyen NT (2008) Mallotus cordatifolius and Mallotus apelta var. kwangsiensis, new records of Euphorbiaceae for Vietnam. VNU Journal of Science. National Science and Technology 24(2S): 293–397.
- Nguyen TKT, Nguyen NT (2014) A new species of Mallotus (Euphorbiaceae) from Vietnam. Gardens' Bulletin (Singapore) 66: 61–65.
- Nguyen TKT, Nguyen NT, Nguyen TVA (2010) Mallotus leptostachyus Hook.f., a new record of Euphorbiaceae for Vietnam. VNU Journal of Science. Natural Sciences and Technology 26(4S): 639–641.
- Pax F, Hoffmann K (1914) Euphorbiaceae–Acalypheae–Mercurialinae. In: Engler A (Ed.) Das Pflanzenreich, IV, 147, vii. Wilhelm Engelmann, Leipzig, Berlin, 145–208.
- Ronquist F, Teslenko M, Van Der Mark P, Ayres DL, Darling A, Höhna S, Larget B, Liu L, Suchard MA, Huelsenbeck JP (2012) MrBayes 3.2: Efficient Bayesian phylogenetic inference and model choice across a large model space. Systematic Biology 61(3): 539–542. https://doi.org/10.1093/SYSBIO/SYS029
- Sierra SEC, Welzen PC, Slik JWF (2005) A taxonomic revision of Mallotus sect. Philippinenses (former section Rottlera-Euphorbiaceae) in Malesia and Thailand. Blumea 50(2): 221–248. https://doi.org/10.3767/000651905x622978
- Sierra SEC, Kulju KKM, Fišer Ž, Aparicio M, Welzen PC (2010) The phylogeny of Mallotus s.str. (Euphorbiaceae) inferred from DNA sequence and morphological data. Taxon 59(1): 101–116. https://doi.org/10.1002/tax.591011
- Tamura K, Stecher G, Kumar S (2021) MEGA11: Molecular Evolutionary Genetics Analysis Version 11. Molecular Biology and Evolution. 38: 3022–3027. https://doi.org/10.1093/molbev/msab120
- Thin NN (2007) Taxonomy of Euphorbiaceae in Vietnam: 179–202. Vietnam National University Publishers, Hanoi.
- Turland NJ, Wiersema JH, Barrie FR, Greuter W, Hawksworth DL, Herendeen PS, Knapp S, Kusber WH, Li DZ, Marhold K, May TW, McNeill J, Monro AM, Prado J, Price MJ, Smith GF [Eds] (2018) International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code). Regnum Vegetabile 159. Koeltz Botanical Books, Glashütten. https://doi.org/10.12705/Code.2018
- van Welzen PC, Chayamarit K (2020) Flora of Thailand. Euphorbiaceae. Naturalis Biodiversity Center, Leiden; Forest Herbarium, National Park, Wildlife and Plant Conservation Department, Bangkok. www.nationaalherbarium.nl/thaieuph