Abstract
A new species of Smilax, S. bolavenensis (Smilacaceae), is described from the Bolaven Plateau, southern Laos. It is similar to S. elegantissima in its elongated inflorescence with slightly zigzagged rachis longer than 20 cm, but the new species is distinguished by its terete stem and petiole (vs. 4-angled with each corner narrowly winged in S. elegantissima) and 42–54-flowered umbels (vs. 7–12). A description, photographs and preliminary conservation status are also provided for S. bolavenensis.
References
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<p>Diels, L. (1900) Die Flora von Central-China. <em>Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie</em> 29 (2): 169−659.</p>
<p>Feng, J.Y., Jin, X.J., Zhang, S.L., Yang, J.W., Fei, S.P., Huang, Y.S., Liu, Y., Qi, Z.C. & Li, P. (2022) <em>Smilax weniae</em>, a new species of Smilacaceae from limestone areas bordering Guizhou and Guangxi, China. <em>Plants</em> 11: 1032. https://doi.org/10.3390/plants11081032</p>
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<p>Kladwong, P. & Chantaranothai, P. (2020) Taxonomic notes on genus <em>Smilax</em> L. (Smilacaceae) from the mainland Southeast Asia. <em>Tropical Natural History</em> 20: 244–255.</p>
<p>Kladwong, P. & Chantaranothai, P. (2022) Notes on <em>Smilax bockii</em> and <em>S. seisuiensis </em>(Smilacaceae), two newly recorded species from Laos and Thailand. <em>Thai Forest Bulletin (Botany)</em> 52: 153–160. https://doi.org/10.20531/tfb.2022.50.2.15</p>
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<p>Koyama, T. (1983) Smilacaceae. <em>In:</em> Leroy, Jean-F. (Ed.) <em>Flore du Cambodge, du Laos et du Viêt-Nam</em>, vol. 20. Muséum national d’histoire naturelle, Paris, pp. 69−124.</p>
<p>Kunth, K.S. (1850)<em> Enumeratio plantarum</em>. Cottae, Stuttgart, 908 pp.</p>
<p>Li, P., Qi, Z.C., Chen, S.C., Cameron, K.M. & Fu, C. (2011) <em>Smilax ligneoriparia </em>sp. nov.: a link between herbaceous and woody <em>Smilax</em> (Smilacaceae) based on morphology, karyotype and molecular phylogenetic data. <em>Taxon</em> 60: 1104–1112. https://doi.org/10.1002/tax.604013</p>
<p>Linnaeus, C. (1753) <em>Species plantarum</em>. Salvius, Stockholm, 1200 pp.</p>
<p>Newman, M.F., Pullan, M., Ketphanh, S., Svengsuksa, B., Thomas, P., Sengdala, K., Lamxay, V. & Armstrong, K. (2017 onwards) <em>A checklist of the vascular plants of Lao PDR</em>. Available from: https://padme.rbge.org.uk/laos/ (accessed 21 February 2022)</p>
<p>Noyori, W., Komada, N., Souladeth, P. & Tagane, S. (2022) <em>Camchaya bolavenensis</em> (Asteraceae: Vernonieae), a new species from Bolaven Plateau, southern Laos. <em>Phytotaxa</em> 536 (1): 1–6. https://doi.org/10.11646/phytotaxa.536.1.1</p>
<p>Phonepaseuth, P., Souladeth, P., Souvannakhoummane, K., Vongthavone, T. & Tagane, S. (2021) Two new species of <em>Sonerila</em> Roxb. (Melastomataceae) from Laos. <em>European Journal of Taxonomy</em> 755: 136–148. https://doi.org/10.5852/ejt.2021.755.1403</p>
<p>POWO (2022) <em>Plants of the World online</em>. Facilitated by the Royal Botanic Gardens, Kew. Available from: http://www.plantsoftheworldonline.org/ (accessed 1 March 2022)</p>
<p>Profile, E. (2012) <em>Indo-Burma biodiversity hotspot</em>. Update Critical Ecosystem Partnership-Fund, Washington, 360 pp.</p>
<p>Roxburgh, W. (1832) <em>Smilax</em>. <em>In:</em> Roxburgh, W. (Ed.) <em>Flora Indica</em>, vol. 3, Thacker, Serampore, pp. 791–796.</p>
<p>Qi, Z.C., Cameron, K.M., Li, P., Zhao, Y.P., Chen, S.C., Chen, G.C. & Fu, C.X. (2013a) Phylogenetics, character evolution, and distribution patterns of the greenbriers, Smilacaceae (Liliales), a near-cosmopolitan family of monocots. <em>Botanical Journal of the Linnean Society</em> 173: 535–548. https://doi.org/10.1111/boj.12096</p>
<p>Qi, Z.C., Li, P. & Fu, C.X. (2013b) New combinations and a new name in <em>Smilax</em> for species of <em>Heterosmilax</em> in Eastern and Southeast Asian Smilacaceae (Liliales). <em>Phytotaxa</em> 117 (2): 58–60. https://dx.doi.org/10.11646/phytotaxa.117.2.4</p>
<p>Qi, Z.C., Shen, C., Han, Y.W., Wang, R.H., Liu, R.Z., Naiki, A. & Li, P. (2016) A new species of <em>Smilax</em> (Smilacaceae) from southern island of Kagoshima prefecture, Japan. <em>Phytotaxa</em> 269 (2): 120–130. http://dx.doi.org/10.11646/phytotaxa.269.2.7</p>
<p>Souladeth, P., Tagane, S., Newman, M.F. & Prajaksood, A. (2020) Two new species of <em>Eriocaulon</em> (Eriocaulaceae) from Laos. <em>Kew Bulletin</em> 75: 56. https://doi.org/10.1007/S12225-020-09909-0</p>
<p>Souvannakhoummane, K., Lanorsavanh, S., Tagane, S., Souladeth, P., Phonpaseuth, P., Pongamornkul, W. & Lamxay, V. (2021) Six new species and eight new records of Gesneriaceae from Laos. <em>Gardens’ Bulletin Singapore</em> 73: 427–456. https://doi.org/10.26492/gbs73(2).2021-13</p>
<p>Sun, Z.Y., Wang, Y.H. Zhao, Y.P. & Fu, C.X. (2015) Molecular, chromosomal and morphological characters reveal a new diploid species in the <em>Smilax china</em> complex (Smilacaceae). <em>Phytotaxa</em> 212 (3): 199–212. https://doi.org/10.11646/phytotaxa.212.3.2</p>
<p>Tagane, S., Souladeth, P., Kongxaysavath, P., Rueangurea, S., Suddee, S., Suyama, Y., Suzuki, E. & Yahara T. (2020) Two new species and 18 new recrods for the flora of Laos. <em>Thai Forest Bulletin (Botany)</em> 49: 111–126. https://doi.org/10.20531/tfb.2021.49.1.14</p>
<p>Vongthavone, T., Tagane, S., Phonepaseuth, P., Souvannakhoummane, K. & Souladeth, P. (2021) Twelve new records of pteridophytes from Bolaven Plateau, sothern Laos. <em>Thai Forest Bulletin (Botany)</em> 49: 182–190. https://doi.org/10.20531/tfb.2021.49.2.05</p>
<p>Yamazaki, T., Souladeth, P. & Tagane S. (2021) <em>Strobilanthes bolavenensis</em>, a new species of Acanthaceae from Bolaven Plateau, southern Laos. <em>Phytotaxa</em> 513 (2): 152–158. https://doi.org/10.11646/phytotaxa.513.2.6</p>
<p>Cameron, K.M. & Fu, C.X. (2006) A nuclear rDNA phylogeny of <em>Smilax</em> (Smilacaceae). <em>Aliso</em> 22: 598–605. https://dx.doi.org/10.5642/aliso.20062201.47</p>
<p>Chen, X. & Koyama, T. (2000) Smilacaceae. <em>In:</em> Wu, Z.Y., Raven, P.H. & Hong D.Y. (Eds.) <em>Flora of China,</em> vol. 24. Missouri Botanical Garden Press, St. Louis and Science Press, Beijing, pp. 96–115. Available from: http://www.efloras.org/flora_page.aspx?flora_id=2 (accessed 1 March 2022)</p>
<p>De Candolle, A. & De Candolle, C. (1878) <em>Monographiae phanerogamarum 6: Smilaceae, Restiaceae, Meliaceae</em>. Masson, Paris, 783 pp.</p>
<p>Diels, L. (1900) Die Flora von Central-China. <em>Botanische Jahrbücher fur Systematik, Pflanzengeschichte und Pflanzengeographie</em> 29 (2): 169−659.</p>
<p>Feng, J.Y., Jin, X.J., Zhang, S.L., Yang, J.W., Fei, S.P., Huang, Y.S., Liu, Y., Qi, Z.C. & Li, P. (2022) <em>Smilax weniae</em>, a new species of Smilacaceae from limestone areas bordering Guizhou and Guangxi, China. <em>Plants</em> 11: 1032. https://doi.org/10.3390/plants11081032</p>
<p>Gagnepain, F. (1934) Liliacées. <em>In:</em> Lecomte, H. (Ed.) <em>Flore générale de l’Indo-Chine</em>, vol. 6. Masson, Paris, pp. 753−815.</p>
<p>Gagnepain, F. (1934) Deux Liliacées nouvelles. <em>Bulletin de la Société Botanique de France</em> 81: 619. https://doi.org/10.1080/00378941.1934.10834005</p>
<p>Heckroth, H.P., Moong, J., Janka, H.I., Fiala, B., Chung, A.Y.C. & Maschwitz, U. (2004) <em>Smilax borneensis</em> (Smilacaceae), an unspecific climbing ant-plant from Borneo and myrmeophytic traits in other Asiatic <em>Smilax</em> species. <em>Sandakania</em> 14: 33–50.</p>
<p>Hô, P. H. (2000) <em>Cay Co Viet Nam: an illustrated flora of Vietnam</em>, vol. 3. The author, Montreal, 1020 pp.</p>
<p>Hooker, J.D. (1892) <em>Smilax</em>. <em>In:</em> Hooker, J.D. (Ed.) <em>The flora of British India</em>, vol 6, Reeve, London, pp. 302–314.</p>
<p>Jin, X.J., Chen, Y., Lee J., Qi, Z.C., Liu, L.X., Li, Q. & Fu, C.X. (2016) A new species of <em>Smilax</em> (Smilacaceae) from Yunnan, China. <em>Phytotaxa</em> 275 (2): 159–167. https://doi.org/10.11646/phytotaxa.275.2.7</p>
<p>Kladwong, P. & Chantaranothai, P. (2020) Taxonomic notes on genus <em>Smilax</em> L. (Smilacaceae) from the mainland Southeast Asia. <em>Tropical Natural History</em> 20: 244–255.</p>
<p>Kladwong, P. & Chantaranothai, P. (2022) Notes on <em>Smilax bockii</em> and <em>S. seisuiensis </em>(Smilacaceae), two newly recorded species from Laos and Thailand. <em>Thai Forest Bulletin (Botany)</em> 52: 153–160. https://doi.org/10.20531/tfb.2022.50.2.15</p>
<p>Kladwong, P. Chantaranothai, P. & Simpson, D.A. (2018) Two new names and five lectotypfied taxa for the genus <em>Smilax</em> (Smilacaceae) and the transfer of <em>Smilax petiolatumidus</em> to the genus <em>Dioscorea</em> (Dioscoreaceae). <em>Thai Forest Bulletin (Botany)</em> 46: 44–57. https://doi.org/10.20531/tfb.2018.46.1.07</p>
<p>Koyama, T. (1975) Smilacaceae. <em>In:</em> Smitinand, T. & Larsen, K. (Eds.) <em>Flora of Thailand</em>, vol. 2(3). Applied Scientific Research Corporation of Thailand, Bangkok, pp. 211–250.</p>
<p>Koyama, T. (1983) Smilacaceae. <em>In:</em> Leroy, Jean-F. (Ed.) <em>Flore du Cambodge, du Laos et du Viêt-Nam</em>, vol. 20. Muséum national d’histoire naturelle, Paris, pp. 69−124.</p>
<p>Kunth, K.S. (1850)<em> Enumeratio plantarum</em>. Cottae, Stuttgart, 908 pp.</p>
<p>Li, P., Qi, Z.C., Chen, S.C., Cameron, K.M. & Fu, C. (2011) <em>Smilax ligneoriparia </em>sp. nov.: a link between herbaceous and woody <em>Smilax</em> (Smilacaceae) based on morphology, karyotype and molecular phylogenetic data. <em>Taxon</em> 60: 1104–1112. https://doi.org/10.1002/tax.604013</p>
<p>Linnaeus, C. (1753) <em>Species plantarum</em>. Salvius, Stockholm, 1200 pp.</p>
<p>Newman, M.F., Pullan, M., Ketphanh, S., Svengsuksa, B., Thomas, P., Sengdala, K., Lamxay, V. & Armstrong, K. (2017 onwards) <em>A checklist of the vascular plants of Lao PDR</em>. Available from: https://padme.rbge.org.uk/laos/ (accessed 21 February 2022)</p>
<p>Noyori, W., Komada, N., Souladeth, P. & Tagane, S. (2022) <em>Camchaya bolavenensis</em> (Asteraceae: Vernonieae), a new species from Bolaven Plateau, southern Laos. <em>Phytotaxa</em> 536 (1): 1–6. https://doi.org/10.11646/phytotaxa.536.1.1</p>
<p>Phonepaseuth, P., Souladeth, P., Souvannakhoummane, K., Vongthavone, T. & Tagane, S. (2021) Two new species of <em>Sonerila</em> Roxb. (Melastomataceae) from Laos. <em>European Journal of Taxonomy</em> 755: 136–148. https://doi.org/10.5852/ejt.2021.755.1403</p>
<p>POWO (2022) <em>Plants of the World online</em>. Facilitated by the Royal Botanic Gardens, Kew. Available from: http://www.plantsoftheworldonline.org/ (accessed 1 March 2022)</p>
<p>Profile, E. (2012) <em>Indo-Burma biodiversity hotspot</em>. Update Critical Ecosystem Partnership-Fund, Washington, 360 pp.</p>
<p>Roxburgh, W. (1832) <em>Smilax</em>. <em>In:</em> Roxburgh, W. (Ed.) <em>Flora Indica</em>, vol. 3, Thacker, Serampore, pp. 791–796.</p>
<p>Qi, Z.C., Cameron, K.M., Li, P., Zhao, Y.P., Chen, S.C., Chen, G.C. & Fu, C.X. (2013a) Phylogenetics, character evolution, and distribution patterns of the greenbriers, Smilacaceae (Liliales), a near-cosmopolitan family of monocots. <em>Botanical Journal of the Linnean Society</em> 173: 535–548. https://doi.org/10.1111/boj.12096</p>
<p>Qi, Z.C., Li, P. & Fu, C.X. (2013b) New combinations and a new name in <em>Smilax</em> for species of <em>Heterosmilax</em> in Eastern and Southeast Asian Smilacaceae (Liliales). <em>Phytotaxa</em> 117 (2): 58–60. https://dx.doi.org/10.11646/phytotaxa.117.2.4</p>
<p>Qi, Z.C., Shen, C., Han, Y.W., Wang, R.H., Liu, R.Z., Naiki, A. & Li, P. (2016) A new species of <em>Smilax</em> (Smilacaceae) from southern island of Kagoshima prefecture, Japan. <em>Phytotaxa</em> 269 (2): 120–130. http://dx.doi.org/10.11646/phytotaxa.269.2.7</p>
<p>Souladeth, P., Tagane, S., Newman, M.F. & Prajaksood, A. (2020) Two new species of <em>Eriocaulon</em> (Eriocaulaceae) from Laos. <em>Kew Bulletin</em> 75: 56. https://doi.org/10.1007/S12225-020-09909-0</p>
<p>Souvannakhoummane, K., Lanorsavanh, S., Tagane, S., Souladeth, P., Phonpaseuth, P., Pongamornkul, W. & Lamxay, V. (2021) Six new species and eight new records of Gesneriaceae from Laos. <em>Gardens’ Bulletin Singapore</em> 73: 427–456. https://doi.org/10.26492/gbs73(2).2021-13</p>
<p>Sun, Z.Y., Wang, Y.H. Zhao, Y.P. & Fu, C.X. (2015) Molecular, chromosomal and morphological characters reveal a new diploid species in the <em>Smilax china</em> complex (Smilacaceae). <em>Phytotaxa</em> 212 (3): 199–212. https://doi.org/10.11646/phytotaxa.212.3.2</p>
<p>Tagane, S., Souladeth, P., Kongxaysavath, P., Rueangurea, S., Suddee, S., Suyama, Y., Suzuki, E. & Yahara T. (2020) Two new species and 18 new recrods for the flora of Laos. <em>Thai Forest Bulletin (Botany)</em> 49: 111–126. https://doi.org/10.20531/tfb.2021.49.1.14</p>
<p>Vongthavone, T., Tagane, S., Phonepaseuth, P., Souvannakhoummane, K. & Souladeth, P. (2021) Twelve new records of pteridophytes from Bolaven Plateau, sothern Laos. <em>Thai Forest Bulletin (Botany)</em> 49: 182–190. https://doi.org/10.20531/tfb.2021.49.2.05</p>
<p>Yamazaki, T., Souladeth, P. & Tagane S. (2021) <em>Strobilanthes bolavenensis</em>, a new species of Acanthaceae from Bolaven Plateau, southern Laos. <em>Phytotaxa</em> 513 (2): 152–158. https://doi.org/10.11646/phytotaxa.513.2.6</p>