Abstract
Lasianthus kbangensis V.S.Dang, Vuong & Naiki, a new species belonging to Lasianthus sect. Nudiflorae of Rubiaceae from the Central Highlands of Vietnam, is described and illustrated. This new species is similar to L. oblongilobus H. Zhu, but differs in having larger leaves, longer petioles, smaller calyx (calyx lobes) and corolla, and the color of ripen fruits. A table comparing the new species to closely related species is provided.
References
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<p>Lo, H.S. (1993) Materials for Chinese Rubiaceae (III). <em>Botanical Journal of South China </em>I: 1–17.</p>
<p>Merrill, E.D. (1922) Noteworthy Philippine Plants XVII. <em>Philippine Journal of Science </em>20: 432.</p>
<p>Merrill, E.D. (1952) William Jack’s genera and species of Malaysian plants. <em>Journal of the Arnold Arboretum</em> 33 (3): 199–230.</p>
<p>Miquel, F.A.W. (1856-1858) <em>Flora van Nederlandsch Indië</em>. Vol. 2. C. G. van der Post, Amsterdam, ix + 1103 pp.</p>
<p>Naiki, A., Tagane, S., Chhang, P., Toyama, H., Zhu, H., Dang, V.S. & Yahara, T. (2015) Flora of Bokor National Park, Cambodia II: four new species and nine new records of <em>Lasianthus </em>(Rubiaceae) from Cambodia. <em>Acta Phytotaxonomica et Geobotanica</em> 66 (3): 153–179. https://doi.org/10.18942/apg.KJ00010115702</p>
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<p>Pham, H.H. (2000) <em>Cây cỏ Việt Nam: An Illustrated Flora of Vietnam</em>, <em>vol. 3</em>. Youth Publication, Ho Chi Minh City, pp. 202–209.</p>
<p>Pitard, J. (1924) Rubiacées <em>In:</em> Lecomte, P.H., Humbert, H. & Gagnepain, F. (Eds.) <em>Flore générale de l’Indo-Chine</em> 3: 395. Masson, Paris, pp. 20–442.</p>
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<p>Roxburgh, W. (1824) <em>Flora Indica; or Descriptions of Indian plants </em>Vol. 2. Mission Press, Serampore, v + 588 pp.</p>
<p>Sy, D.T., Do, V.H., Choudhary, R.K., Tran, T.B., Chu, H.M., Nguyen, H.Q., Nguyen, T.T.N., Tucker, G.C. & Lee, J. (2020) <em>Capparis kbangensis </em>(Capparaceae), a new species from central Vietnam. <em>PhytoKeys </em>151: 83–91. [https://phytokeys.pensoft.net/article/50477/]</p>
<p>Sy, D.T., Tran, T.B., Choudhary, R.K., Tucker, G.C., Do, V.H., Bui, H.Q., Vu, T.C. & Lee, J. (2015) <em>Capparis gialaiensis </em>(Capparaceae), a new species from Vietnam. <em>Annales Botanici Fennici </em>52: 219–223. [https://www.jstor.org/stable/43745839]</p>
<p>Zhu, H. (2001) A taxonomic revision of the genus <em>Lasianthus</em> Jack (Rubiaceae) from Thailand. <em>Acta Phytotaxonomica Sinica </em>39: 116–150.</p>
<p>Zhu, H. (2002) A revision of the genus <em>Lasianthus</em> (Rubiaceae) from China. <em>Systematics and Geography of Plant </em>72: 63–1109. [https://www.jstor.org/stable/3668764]</p>
<p>Zhu, H. & Roos, M.C. (2002) Three new species of the genus <em>Lasianthus</em> (Rubiaceae) from Vietnam. <em>Blumea </em>47: 395–401.</p>
<p>Zhu, H. & Taylor, C.M. (2011) <em>Lasianthus</em>. <em>In:</em> Wu, Z.Y., Raven, P.H. & Hong, D.Y. (Eds.) <em>Flora of China</em>, vol. 19. Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, pp. 185–198.</p>
<p>Zhu, H., Roos, M.C. & Ridsdale, C.E. (2012) A taxonomic revision of the Malesian species of <em>Lasianthus</em> (Rubiaceae). <em>Blumea</em> 57: 1–102. https://doi.org/10.3767/000651912X652012</p>
<p>Zhu, H. (2015) <em>Paralasianthus </em>(Rubiaceae), a new genus from Southeast Asia. <em>Phytotaxa </em>202 (4): 273–278. http://dx.doi.org/10.11646/phytotaxa.202.4.5</p>
<p>Bui, H.Q., Do, V.H., Nguyen, S.K., Le, T.M.L., Tran, D.B., Doan, H.S., Tran, T.P.A. & Moller, M. (2019) <em>Boeica konchurangensis </em>sp. nov. (Gesneriaceae) from Gia Lai plateau, Vietnam. <em>Nordic Journal of Botany</em> 37 (5): 1–8. https://onlinelibrary.wiley.com/doi/abs/10.1111/njb.02333</p>
<p>Bui, H.Q., Tran, T.B., Ha, T.D., Do, V.H., Nguyen, T.T.H., Bui, T.H. & Dang, V.S. (2020) A new species of <em>Psydrax</em> (Vanguerieae, Rubiaceae) from the Gia Lai Plateau, southern Vietnam. <em>PhytoKeys </em>149: 99–107. https://doi.org/10.3897/phytokeys.149.51710</p>
<p>Dang, V.S. & Naiki, A. (2019) Two new species of <em>Lasianthus </em>(Rubiaceae) from Hoang Lien National Park, northern Vietnam. <em>Phytotaxa</em> 423 (1): 33–40. https://doi.org/10.11646/phytotaxa.423.1.4</p>
<p>Dang, V.S. & Naiki, A. (2020) Two new species of <em>Lasianthus </em>(Rubiaceae) from northern Vietnam. <em>Annales Botanici Fennici</em> 57: 49–54. https://doi.org/10.5735/085.057.0106</p>
<p>Do, V.H., Duong, T.H., Lin, Z., Deng, Y., Choudhary, R.K. & Lee, J. (2021) <em>Rungia gialaiensis</em> (Acanthaceae), a new species from the Central Highlands of Vietnam. <em>Phytotaxa</em> 500 (4): 294–300. https://doi.org/10.11646/phytotaxa.500.4.5</p>
<p>Do, V.H., Min, D.Z., Nguyen, S.K., Tan, Y.H., Thoa, P.T.K., Bramley, G.L.C., Rogier, P.J.K. & Li, B. (2018) <em>Premna vietnamensis</em> (Lamiaceae, Premnoideae), a distinct new species from the Central Highlands of Vietnam. <em>PLoS ONE</em> 13 (5): e0195811. https://doi.org/10.1371/journal.pone.0195811</p>
<p>Gangopadhyay, M. & Chakrabarty, T. (1992) A note on the status of <em>Litosanthes</em> Bl. (Rubiaceae). <em>Journal of Economic and Taxonomic Botany</em> 16: 337–338.</p>
<p>Ha, T.D., Bui, H.Q., Tran, T.B., Do, V.H., Nguyen, T.T.H., Bui, T.H., Tagane, S., Oguri, E., Naiki, A. & Dang, V.S. (2020) A new species of <em>Lasianthus </em>(Rubiaceae), <em>L. konchurang</em>, from the Central Highlands of Vietnam. <em>Phytotaxa</em> 451 (2): 161–168. https://doi.org/10.11646/phytotaxa.451.2.6</p>
<p>Hance, H.F. (1885) Spicilegia florae sinensis: diagnoses of new and habitats of rare or hitherto unrecorded, Chinese plants. <em>Journal of Botany</em> 23: 321–330.</p>
<p>Hebert, P.D.N. & Gregory, T.R. (2005) The promise of DNA barcoding for taxonomy. <em>Systematic Biology</em> 54: 852–859. [https://www.jstor.org/stable/20061289]</p>
<p>IUCN (2019) <em>Guidelines for Using the IUCN Red List Categories and Criteria</em>. Version 14. Prepared by the Standards and Petitions Subcommittee. [http://cmsdocs.s3.amazonaws.com/RedListGuidelines.pdf]</p>
<p>Jannerup, P.L. (2006) A revision of the genus <em>Lasianthus</em> (Rubiaceae) in Africa, excluding Madagascar. <em>Nordic Journal of Botany</em> 23: 641–702. [https://onlinelibrary.wiley.com/doi/10.1111/j.1756-1051.2003.tb00445.x]</p>
<p>Jack, W. (1823) Account of the <em>Lansium</em> and some other genera of Malayan plants. <em>Transactions of the Linnean Society of London</em> 14: 125–126.</p>
<p>King, G. & Gamble, J.S. (1904) <em>Lasianthus </em>Jack. <em>Journal of the Asiatic Society of Bengal</em> 73: 106–133.</p>
<p>Korthals, P.W. (1851) <em>Mephitidia</em> sect. <em>Dysosmia</em> Korthals. Nederlandsch Kruidkundig Archief. <em>Verslangen en Mededelingen der Nederlandsche Botanische Vereeniging</em> 2 (2): 217–224.</p>
<p>Lo, H.S. (1993) Materials for Chinese Rubiaceae (III). <em>Botanical Journal of South China </em>I: 1–17.</p>
<p>Merrill, E.D. (1922) Noteworthy Philippine Plants XVII. <em>Philippine Journal of Science </em>20: 432.</p>
<p>Merrill, E.D. (1952) William Jack’s genera and species of Malaysian plants. <em>Journal of the Arnold Arboretum</em> 33 (3): 199–230.</p>
<p>Miquel, F.A.W. (1856-1858) <em>Flora van Nederlandsch Indië</em>. Vol. 2. C. G. van der Post, Amsterdam, ix + 1103 pp.</p>
<p>Naiki, A., Tagane, S., Chhang, P., Toyama, H., Zhu, H., Dang, V.S. & Yahara, T. (2015) Flora of Bokor National Park, Cambodia II: four new species and nine new records of <em>Lasianthus </em>(Rubiaceae) from Cambodia. <em>Acta Phytotaxonomica et Geobotanica</em> 66 (3): 153–179. https://doi.org/10.18942/apg.KJ00010115702</p>
<p>Nguyen, V.D., Dinh, Q.D., Ha, M.T., Bui, H.Q. & Boy, P.C. (2019) A new species of <em>Anadendrum</em> (Araceae - Anadendreae) from Vietnam. <em>Blumea</em> 64: 190–193. [https://www.ingentaconnect.com/content/nhn/blumea/2019/00000064/00000002/art00012;jsessionid=7rk1hd1hed1su.x-ic-live-03]</p>
<p>Pham, H.H. (2000) <em>Cây cỏ Việt Nam: An Illustrated Flora of Vietnam</em>, <em>vol. 3</em>. Youth Publication, Ho Chi Minh City, pp. 202–209.</p>
<p>Pitard, J. (1924) Rubiacées <em>In:</em> Lecomte, P.H., Humbert, H. & Gagnepain, F. (Eds.) <em>Flore générale de l’Indo-Chine</em> 3: 395. Masson, Paris, pp. 20–442.</p>
<p>Robbrecht, E. (1988) Tropical woody Rubiaceae. <em>Opera Botanica Belgica</em> 1: 132.</p>
<p>Roxburgh, W. (1824) <em>Flora Indica; or Descriptions of Indian plants </em>Vol. 2. Mission Press, Serampore, v + 588 pp.</p>
<p>Sy, D.T., Do, V.H., Choudhary, R.K., Tran, T.B., Chu, H.M., Nguyen, H.Q., Nguyen, T.T.N., Tucker, G.C. & Lee, J. (2020) <em>Capparis kbangensis </em>(Capparaceae), a new species from central Vietnam. <em>PhytoKeys </em>151: 83–91. [https://phytokeys.pensoft.net/article/50477/]</p>
<p>Sy, D.T., Tran, T.B., Choudhary, R.K., Tucker, G.C., Do, V.H., Bui, H.Q., Vu, T.C. & Lee, J. (2015) <em>Capparis gialaiensis </em>(Capparaceae), a new species from Vietnam. <em>Annales Botanici Fennici </em>52: 219–223. [https://www.jstor.org/stable/43745839]</p>
<p>Zhu, H. (2001) A taxonomic revision of the genus <em>Lasianthus</em> Jack (Rubiaceae) from Thailand. <em>Acta Phytotaxonomica Sinica </em>39: 116–150.</p>
<p>Zhu, H. (2002) A revision of the genus <em>Lasianthus</em> (Rubiaceae) from China. <em>Systematics and Geography of Plant </em>72: 63–1109. [https://www.jstor.org/stable/3668764]</p>
<p>Zhu, H. & Roos, M.C. (2002) Three new species of the genus <em>Lasianthus</em> (Rubiaceae) from Vietnam. <em>Blumea </em>47: 395–401.</p>
<p>Zhu, H. & Taylor, C.M. (2011) <em>Lasianthus</em>. <em>In:</em> Wu, Z.Y., Raven, P.H. & Hong, D.Y. (Eds.) <em>Flora of China</em>, vol. 19. Science Press, Beijing, and Missouri Botanical Garden Press, St. Louis, pp. 185–198.</p>
<p>Zhu, H., Roos, M.C. & Ridsdale, C.E. (2012) A taxonomic revision of the Malesian species of <em>Lasianthus</em> (Rubiaceae). <em>Blumea</em> 57: 1–102. https://doi.org/10.3767/000651912X652012</p>
<p>Zhu, H. (2015) <em>Paralasianthus </em>(Rubiaceae), a new genus from Southeast Asia. <em>Phytotaxa </em>202 (4): 273–278. http://dx.doi.org/10.11646/phytotaxa.202.4.5</p>