Abstract
Mitreola crystallina was proposed in 2006, but not valid. Here, we validate the name by giving a complete description, diagnosis, and illustration as a new species of Loganiaceae. Morphologically, it is most similar to M. pedicellata, but can be distinguished by its stems erect (vs. creeping), corolla lobes blue (vs. white), and stamens inserted at or near base of the corolla tube (vs. middle to nearly mouth of corolla tube). It is endemic to the shady cliffs of limestone forests of Malipo County, southwest China. The conservation status was assessed as data deficient (DD) according to the IUCN Red List categories and criteria. And a key to species of Mitreola in China is provided.
References
<p class="Reference">Bentham, G. (1856) Notes on Loganiaceae. <em>Botanical Journal of the Linnean Society </em>1: 52–96.</p><p class="Reference"> <a href="https://doi.org/10.1111/j.1095-8312.1856.tb00995.x">https://doi.org/10.1111/j.1095-8312.1856.tb00995.x</a></p><p class="Reference">Chen, M.X. (1995) The geographical distribution of the Loganiaceae in China. <em>Journal of South China Agricultural University</em> 16 (2): 92–97.</p><p class="Reference">Conn, B.J. (1996) <em>Mitreola minima</em> (Loganiaceae), a new species from western Australia.<em> Kew Bulletin</em> 51: 169–173.</p><p class="Reference"> <a href="https://dx.doi.org/10.2307/4118754">https://dx.doi.org/10.2307/4118754</a></p><p class="Reference">Fang, D., Qin, H.D., 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.</p><p class="Reference">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. Beer, Lipsiae, 884 pp.</p><p class="Reference"> <a href="https://doi.org/10.5962/bhl.title.36932">https://doi.org/10.5962/bhl.title.36932</a></p><p class="Reference">Islas-Hernández, C.S., Booth, H.O., Valencia-Ávalos, S. & Alvarado-Cárdenas, L.O. (2019) El género <em>Mitreola </em>(Loganiaceae) en México. <em>Acta Botanica Mexicana</em> 126: 1–16.</p><p class="Reference"> <a href="https://doi.org/10.21829/abm126.2019.1388">https://doi.org/10.21829/abm126.2019.1388</a></p><p class="Reference">IUCN (2019) <em>Guidelines for using the IUCN Red List categories and criteria,</em> version 14<em>. </em>IUCN Standards and Petitions Committee. Available from: <a href="http://www.iucnredlist.org/documents/RedListGuidelines.pdf">http://www.iucnredlist.org/documents/RedListGuidelines.pdf</a>. (accessed 24 October 2020)</p><p class="Reference">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.</p><p class="Reference">Linnaeus, C. (1758) <em>Opera Varia</em>. Ex Typographia Juntiniana, Lucae, 410 pp.</p><p class="Reference">Li, P.T. (1979) Two new species of Loganiaceae from China. <em>Acta Phytotaxonomica Sinica</em> 17 (3): 115–117.</p><p class="Reference">Li, P.T. (1992) <em>Mitreola</em>. <em>In:</em> Chang, M.C. & Qiu, L.Q. (Eds.) <em>Flora Reipublicae Popularis Sinicae. </em>vol. 61. Science Press, Beijing, pp. 259–264.</p><p class="Reference">Li, P.T. & Leeuwenberg, A.J.M. (1996) <em>Miterola</em>. <em>In:</em> Wu, Z.Y. & Raven, P.H. (Eds.) <em>Flora of China, </em>vol. 15. Science Press, Beijing & Missouri Botanical Garden Press, St. Louis, pp. 320–322.</p><p class="Reference">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: 685–689.</p><p class="Reference">Shan, Z., Du, X., Ding, T., Mu, Z. & Wang, X. (2019) <em>Mitreola liui</em> sp. nov. (loganiaceae, loganioideae), a new species from Chongqing, China. <em>Pakistan Journal of Botany</em> 51: 2251–2254.</p><p class="Reference"> <a href="https://doi.org/10.30848/PJB2019-6(24)">https://doi.org/10.30848/PJB2019-6(24)</a></p><p class="Reference">Shui, Y.M. & Chen, W.H. (2006) <em>Seed Plants of the Karst Region in China, </em>vol. 1 (Southeast Yunnan). Science Press, Beijing, 260 pp.</p><p class="Reference">Thiers, B. (2019) <em>Index herbariorum. </em>New York Botanical Garden’s Virtual Herbarium Database. Available from: <a href="http://sweetgum.nybg.org/ih/"><span style="text-decoration: underline;">http://sweetgum.nybg.org/ih/</span></a> (accessed 24 October 2020)</p><p class="Reference">Tirel, C. (1969) Deux nouvelles espèces vietnamiennes appartenant aux genres <em>Mitreola </em>L. et <em>Strychnos</em> L. <em>Adansonia </em>9: 119–123.</p><p class="Reference">Torrey, J. & Gray, A. (1841) <em>A flora of north American: containing abridged descriptions of all the known indigenous and naturalized plants growing north of Mexico, arranged according to the natural system.</em> vol. 2, New York Wiley & Putnam, 504 pp.</p><p class="Reference"> <a href="https://doi.org/10.5962/bhl.title.9466">https://doi.org/10.5962/bhl.title.9466</a></p><p class="Reference">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. (2018) <em>International Code of Nomenclature for Algae, Fungi, and Plants (Shenzhen Code)</em> <em>adopted by the Nineteenth International Botanical Congress Shenzhen, China, July 2017.</em> [Regnum Vegetabile vol. 159]. Koeltz Botanical Books, Glashütten.</p><p class="Reference"> <a href="https://doi.org/10.12705/Code.2018">https://doi.org/10.12705/Code.2018</a></p><p class="Reference">Wang, R.J. (2018) <em>Mitreola</em>. <em>In:</em> Li, D.Z., Chen, Z.R., Wang, H. & Lu, A.M. (Eds.) <em>A</em> <em>Dictionary of The Families and Genera of Chinese Vascular Plants</em>. Science Press, Beijing, p. 337.</p><p>Yang, Y.G. (1990) <em>Comprehensive Natural Regionalization of Yunnan Province.</em> Higher Education Press, Beijing, 251 pp.</p>