Abstract
Mitreola capitata, a new species of Loganiaceae, is described and illustrated. The species was discovered in 2022 during a botanical survey of Phong Nha-Ke Bang National Park (Quang Binh Province, northern Vietnam), where it inhabits a steep limestone rock. Mitreola capitata is remarkable for its habit that includes a leaf-rosette, compact head-like inflorescence with long peduncle and prominent indumentum of most plant parts. The new species is most similar to M. spathulifolia, differing by smaller leaves, dense and compact inflorescence, shorter pedicel, hairy calyx and smaller capsule. Typification of M. spathulifolia is revised, and a lectotype is selected.
References
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<p>Turland, N.J., Wiersema, J.H., Barrie, F.R., Greuter, W., Hawksworth, D.L., Herendeen, P.S., Knapp, S., Kusber, W.-H., Li, D.-Z., Marhold, K., May, T.W., McNeill, J., Monro, A.M., Prado, J., Price, M.J. & Smith, G.F. (Eds.) (2018) <em>International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017</em>. [Regnum Vegetabile 159]. Koeltz Botanical Books, Glashütten. https://doi.org/10.12705/Code.2018</p>
<p>You, J.R., Ran, J., Liu, C., Shui, Y.M., Li, J.X. & Wu, L. (2020) Validation of the name <em>Mitreola crystallina</em> (Loganiaceae), a new species endemic to southwestern China. <em>Phytotaxa</em> 471 (2): 139–144. https://doi.org/10.11646/phytotaxa.471.2.4</p>
<p>Bentham, G. (1856) Notes on Loganiaceae. <em>Journal of the Proceedings of the Linnean Society of London. Botany</em> 1 (2): 52–96. https://doi.org/10.1111/j.1095-8339.1856.tb00636.x</p>
<p>Chen, X.X. (2011) Loganiaceae. <em>In</em>: Guangxi Inst. of Botany (Org.) <em>Flora of Guangxi</em>. Vol. 3. Guangxi Science and Technology Press, Nanning, pp. 756–772. [In Chinese]</p>
<p>Conn, B.J. (1996) <em>Mitreola minima</em> (Loganiaceae), a new species from Western Australia. <em>Kew Bulletin</em> 51 (1): 169–173. https://doi.org/10.2307/4118754</p>
<p>Fang, D., Qin, D.H., Zhou, L.S. & Lu, X.H. (1995) Four new species of <em>Mitreola</em> Linn. (Loganiaceae) from Guangxi. <em>Journal of Tropical and Subtropical Botany</em> 3 (3): 30–35. https://dx.doi.org/10.3969/j.issn.1005-3395.1995.3.004</p>
<p>Gmelin, G.F. (1791) <em>Caroli a Linné Systema Naturae per Regna Tria Naturae, secundum classes, ordines, genera, species, cum characteribus et differentiis</em>. Tomus II. Editio decima tertia, aucta, reformata. G.E. Beer, Leipzig (Lipsiae), 884 pp. https://doi.org/10.5962/bhl.title.36932</p>
<p>Huang, S.X. (Ed.) (2007) <em>Plants endemic to Guangxi province</em>. Vol. 1. Guangxi Science & Technology Publishing House, Nanning, 160 pp. [in Chinese]</p>
<p>Leeuwenberg, A.J.M. (1974) The Loganiaceae of Africa XII. A revision of <em>Mitreola</em> L. <em>Mededelingen Landbouwhogeschool Wageningen Nederland</em> 74 (23): 1–28. https://edepot.wur.nl/291014</p>
<p>Li, P.T. (1979) Two new species of Loganiaceae from China. <em>Acta Phytotaxonomica Sinica</em> 17 (3): 115–117. [https://www.jse.ac.cn/EN/Y1979/V17/I3/115]</p>
<p>Liao, J.J. & Chen, Y.S. (2021) <em>Mitreola bullata</em> sp. nov. (Loganiaceae), a new species from Yunnan, China. <em>Phytotaxa</em> 487 (2): 181–184. https://doi.org/10.11646/phytotaxa.487.2.10</p>
<p>Linnaeus, C. (1758) <em>Opera Varia</em>. Typographia Juntiniana, Lucca, 376 pp. https://doi.org/10.5962/bhl.title.154190</p>
<p>Liu, C., Han, M.Q. & Cai, J. (2022) <em>Mitreola liuyanii</em> (Loganiaceae), a new species from Guizhou, China. <em>Taiwania</em> 67 (2): 250‒253. https://doi.org/10.6165/tai.2022.67.250</p>
<p>Ma, Q.X., Xing, F.W. & Ye, H.G. (2010) <em>Mitreola yangchunensis</em> (Loganiaceae), a new species from China. <em>Pakistan Journal of Botany</em> 42 (2): 685–689.</p>
<p>Shan, Z.J., Du, X.L., Ding, T., Mu, Z.J. & Wang, X.Y. (2019) <em>Mitreola liui</em> sp. nov. (Loganiaceae, Loganioideae), a new species from Chongqing, China. <em>Pakistan Journal of Botany</em> 51 (6): 2251–2254. https://doi.org/10.30848/PJB2019-6(24)</p>
<p>Shan, Z.J., Li, R.N., Pan, B., Mu, Z.J., Cao, L., Hou, Z.Q. & Du, X.L. (2021) <em>Mitreola lincangensis</em> (Loganiaceae, Loganioideae), a new species from Yunnan, China. <em>Pakistan Journal of Botany</em> 53 (1): 155–159. https://doi.org/10.30848/PJB2021-1(23)</p>
<p>Struwe, L., Gibbons, K.L., Conn, B.J. & Motley, T.J. (2018) Loganiaceae. <em>In</em>: Kadereit, J.W. & Bittrich, V. (Eds.) <em>The families and genera of vascular plants</em>, 15. Springer International Publishing, Cham, pp. 511–526. https://doi.org/10.1007/978-3-319-93605-5_8</p>
<p>Tirel, C. (1969) Deux nouvelles espèces Vietnamiennes appartenant aux genres <em>Mitreola</em> L. et <em>Strychnos</em> L. <em>Adansonia</em>, ser. 2, 9 (1) : 119–123.</p>
<p>Torrey, J. & Gray, A. (1841) <em>A flora of north America: containing abridged descriptions of all the known indigenous and naturalized plants growing north of Mexico; arranged according to the natural system</em>. Vol. 2. Wiley & Putnam, New York & London, 504 pp. https://doi.org/10.5962/bhl.title.9466</p>
<p>Turland, N.J., Wiersema, J.H., Barrie, F.R., Greuter, W., Hawksworth, D.L., Herendeen, P.S., Knapp, S., Kusber, W.-H., Li, D.-Z., Marhold, K., May, T.W., McNeill, J., Monro, A.M., Prado, J., Price, M.J. & Smith, G.F. (Eds.) (2018) <em>International Code of Nomenclature for algae, fungi, and plants (Shenzhen Code) adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017</em>. [Regnum Vegetabile 159]. Koeltz Botanical Books, Glashütten. https://doi.org/10.12705/Code.2018</p>
<p>You, J.R., Ran, J., Liu, C., Shui, Y.M., Li, J.X. & Wu, L. (2020) Validation of the name <em>Mitreola crystallina</em> (Loganiaceae), a new species endemic to southwestern China. <em>Phytotaxa</em> 471 (2): 139–144. https://doi.org/10.11646/phytotaxa.471.2.4</p>