Abstract
Taxonomic monograph of Eugenia sect. Schizocalomyrtus, supported by molecular and morphological evidence, is presented. The flowers of this section have unusual fused calyces that are contrasted with standard Eugenia flowers with free calyx lobes. Because the fused calyx recurs in Myrtaceae and has been historically misleading for taxonomists, a key to Neotropical genera with fused calyces is presented. Additionally, Eugenia sect. Schizocalomyrtus is circumscribed, and a key to the ten species included in this section (two newly described) is provided. Detailed species descriptions, distribution and habitat notes, phenology, conservation status, nomenclatural and taxonomic comments, illustrations and distribution maps are also provided.
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<p>Flickinger, J.A., Jestrow, B., Prieto, R.O., Santiago-Valentín, E., Sustache-Sustache, J., Jiménez-Rodríguez, Campbell, K.C.S.E. & Francisco-Ortega, J. (2020) A phylogenetic survey of Myrtaceae in the Greater Antilles with nomenclatural changes for some endemic species. <em>Taxon</em> 69: 448–480. https://doi.org/10.1002/tax.12263</p>
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<p>Giaretta, A., Lucas, E., Souza, M.C., Mazine, F.F. & Sano, P.T. (2018) Nomenclatural notes on <em>Eugenia</em> with closed calyces: <em>Calycorectes</em> O.Berg and <em>Mitranthes</em> O.Berg (Myrtaceae). <em>Phytotaxa</em> 362: 282–286. https://doi.org/10.11646/phytotaxa.362.3.4</p>
<p>Giaretta, A., Amorim, B.S., Sano, P.T., Souza, G. & Lucas, E. (2019a) Phylogenetic placement of new species with fused calyx reveals homoplastic character in <em>Eugenia</em> (Myrtaceae). <em>Systematic Botany</em> 44: 66–73.</p>
<p> http https://doi.org/10.1600/036364419X697903</p>
<p>Giaretta, A., Vasconcelos, T.N.C., Mazine, F.F., Faria, J.E.Q., Flores, R., Holst, B., Sano, P.T. & Lucas, E. (2019b) Calyx (con)fusion in a hyper-diverse genus: Parallel evolution of unusual flower patterns in <em>Eugenia</em> (Myrtaceae). <em>Molecular Phylogenetics and Evolution</em> 139: 106553. https://doi.org/10.1016/j.ympev.2019.106553</p>
<p>Grisebach, A.H.R. (1860) Myrtaceae. <em>Plantae Wrightianae</em> 1: 182.</p>
<p>Hickey, L.J. (1973) Classification of the architecture of dicotyledonous leaves. <em>American Journal of Botany</em> 60: 17–33. https://doi.org/10.2307/2441319</p>
<p>Hochstetter, C.F. (1844) Nova genera plantarum Africae, proponit et describit. <em>Flora</em> 27: 1–8.</p>
<p>IUCN (2017) Standards and Petitions Subcommittee of the IUCN Species Survival Commission <em>Guidelines for Using the IUCN Red List - Categories and Criteria. Version 13</em>. Prepared by the Standards and Petitions Subcommittee, 101 pp.</p>
<p>Kausel, E. (1967) Lista de las Mirtáceas e Leptospermáceas Argentinas. <em>Lilloa</em> 32: 323–368.</p>
<p>Kiaerskou, H. (1893) Enumeratio myrtacearum brasiliensium quas collegiunt Glaziou, Lund, Mendonça, Raben, Reinhardt, Schenck, Warming aliique. <em>In:</em> E. Warming (Ed<em>.) Symbolarum ad floram Brasiliae Centralis cognoscendam </em>39: 1–199.://dx.doi.org/10.5962/bhl.title.4459</p>
<p>Kuntze, O. (1891) Revisio Generum Plantarum. <em>Myrtaceae</em> 1: 1–374. https://doi.org/10.5962/bhl.title.327</p>
<p>Lamarck, J.B.P.A.M. (1789) <em>Encyclopédie méthodique. Botanique</em> 3: 1–759. https://doi.org/10.5962/bhl.title.824</p>
<p>Landrum, L.R. & Kawasaki, M.L. (1997) The genera of Myrtaceae in Brazil: An illustrated synoptic treatment and identification keys. <em>Brittonia</em> 49: 508–536. https://doi.org/10.2307/2807742</p>
<p>Legrand, C.D. (1961) Mirtáceas del Estado de Santa Catarina (Brasil). <em>Sellowia</em> 13: 265–364.</p>
<p>Legrand, C.D. (1970) Una nueva especie de <em>Calycorectes</em> del Brasil Austral. <em>Comunicaciones Botanicas del Museo de Historia Natural de Montevideo</em> 4 (51): 1–7.</p>
<p>Legrand, C.D. & Klein, R.M. (1977) Mirtáceas - Suplemento I. <em>In:</em> P.R. Reitz (Ed.) <em>Flora Ilustrada Catarinense</em> 1–34.</p>
<p>Legrand, C.D. & Mattos, J.R. (1975) Novidades taxonômicas em Myrtaceae. <em>Loefgrenia</em> 67: 1–32.</p>
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