Abstract
A revision of Monimiaceae from the Southern limit of the Atlantic forest domain resulted in the discovery of a species heretofore undescribed. Mollinedia leucantha, a treelet endemic to the Atlantic coastal moist forest in southern Brazil, is described and illustrated. Morphologically the new species is most similar to Mollinedia schottiana, from which it is set apart by characteristics in the rhytidome, leaves, trichomes, flowers and fruitlets, as well as by distinct flowering times. Additionally, scanning electron microscopy (SEM) images of the flowers and a key to distinguish morphologically similar or related species in the subtropical Atlantic forest are presented. A preliminary extinction risk assessment is also provided for the new species.
References
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<p>IUCN (2019) <em>Guidelines for Using the IUCN Red List Categories and Criteria, </em>version 11. IUCN Standards and Petitions Subcommittee. Available from: https://www.iucnredlist.org/resources/redlistguidelines (accessed 3 March 2021)</p>
<p>Lírio, E.J. de, Peixoto, A.L. (2017) Flora do Espírito Santo: Monimiaceae. <em>Rodriguésia</em> 68 (5): 1725–1765. https://doi.org/10.1590/2175-7860201768513</p>
<p>Lírio, E.J., Peixoto, A.L. & Pignal, M. (2020) Monimiaceae. <em>In</em>: Flora do Brasil 2020. Jardim Botânico do Rio de Janeiro. Available from: http://floradobrasil.jbrj.gov.br/reflora/floradobrasil/FB10070 (accessed 3 March 2021)</p>
<p>Peixoto, A.L. (1987) <em>Revisão taxonômica do gênero </em>Mollinedia<em> Ruiz & Pavón (Monimiaceae, Monimioideae). </em>Doctoral Thesis. Universidade Estadual de Campinas, Campinas, 392 pp.</p>
<p>Peixoto, A.L. (2002) Monimiaceae.<em> In: </em>Wanderlei, M.G.L., Shepherd, G.J., Giulietti, A.M., Melhem, T.S., Bittrich, V., Kameyama, C., <em>Flora Fanerogâmica do Estado de São Paulo, vol. 2, </em>pp. 189–207. São Paulo: FAPESP/RiMa. Available from: [https://www.infraestruturameioambiente.sp.gov.br/institutodebotanica/wp-content/uploads/sites/235/2016/06/FFESP-Volume-II_06_24.pdf]</p>
<p>Peixoto, A.L., Reitz, R., Guimarães, E.F. (2001) Monimiaceae.<em> In: </em>Reis, A. (Ed.) <em>Flora Ilustrada Catarinense. </em>Herbário Barbosa Rodrigues, Itajaí (SC), 64 pp.</p>
<p>Perkins, J.R. (1898) Beiträge zur Kenntnis der Monimiaceae. I. Über die Gliederung der Gattungen der Mollinedieae. <em>Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie </em>25: 547–577.</p>
<p>Perkins, J.R. (1900) Monographie der Gattung <em>Mollinedia</em>. <em>Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie </em>27: 636–683.</p>
<p>Perkins, J.R. (1902) Nachtrag zur Monographie der Monimiaceae in Engler’s Pflanzenreich Heft IV. Beschreibung einiger neuen Arten. <em>Botanische Jahrbücher für Systematik, Pflanzengeschichte und Pflanzengeographie</em> 31: 743–748.</p>
<p>Philipson, W.R. (1993) Monimiaceae.<em> In: </em>Kubitzki, K., Rohwer, J.G., and Bittrich, V. (Eds.) <em>The Families and Genera of Vascular Plants, </em>Vol. II.<em> Dicotyledons: Magnoliid, Hamamelid and Caryophyllid Families. </em>Springer, Berlin, pp. 426–437. https://doi.org/10.1007/978-3-662-02899-5_50</p>
<p>QGIS Development Team (2021) <em>QGIS Geographic Information System.</em> QGIS Association. [http://www.qgis.org]</p>
<p>Reitz, R. (1961) Monimiáceas Catarinenses. <em>Sellowia</em> 13: 117–132.</p>
<p>Renner, S.S., Strijk, J.S., Strasberg, D. & Thébaud, C. (2010) Biogeography of the Monimiaceae (Laurales): a role for East Gondwana and long-distance dispersal, but not West Gondwana. <em>Journal of Biogeography</em> 37: 1227–1238. https://doi.org/10.1111/j.1365-2699.2010.02319.x</p>
<p>Ruiz, L.H. & Pavón, J.A. (1794) <em>Florae Peruvianae, et Chilensis Prodromus.</em> Imprenta de Sancha, Madrid, 154 pp.</p>
<p>Saint-Hilaire, A. de (1887) <em>Voyage à Rio Grande do Sul (Brésil). </em>H. Herluison, Orléans, 644 pp.</p>
<p>Sprengel, K.P.J. (1827) <em>Systema Vegetabilium,</em> editio decima sexta, vol. 4 (2). Sumtibus Librariae Dieterichianae, Göttingen [Gottingae], 410 pp. [https://www.biodiversitylibrary.org/item/15255#page/593]</p>
<p>Thiers, B. (2021 [continuously updated]) <em>Index Herbariorum. A global directory of public herbaria and associated staff. </em>New York Botanical Garden’s Virtual Herbarium. Available from: http://sweetgum.nybg.org/science/ih/ (accessed 3 March 2021)</p>
<p>Tulasne, L.R. (1855) Diagnoses nonnullas e Monimiacearum recensione tentata excerptas. <em>Annales des Sciences Naturelles, Botanique,</em> série 4, 3: 29–46. [https://www.biodiversitylibrary.org/item/129792#page/35/]</p>
<p>Tulasne, L.R. (1855–1856) Monographia Monimiacearum. <em>Archives du Museum d’Histoire Naturelle</em> <em>(Paris)</em> 8: 273–436.</p>
<p>Vattimo, I. (1957) Flora do Itatiaia, I. Monimiaceae. <em>Rodriguésia</em> 20 (32): 56–61.</p>