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Two new species of Myrcia sect. Reticulosae (Myrtaceae) from the campo rupestre of Minas Gerais, Brazil

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Abstract

Two new species of Myrcia sect. Reticulosae, M. carassana and M. revoluta are here described and illustrated. Myrcia carassana was firstly recognized in 1908 by A. F. M. Glaziou but never validly published. This species is similar to M. venosissima but differs by reddish trichomes, inflorescences botryoid or reduced to simple dichasia with longer peduncles, obconic floral buds and calyx lobes internally densely pilose. Myrcia revoluta resembles M. reticulosa but differs by leaves strongly revolute, densely pilose abaxially when mature, and subterminal inflorescences subtended by reduced leaves.

Resumo

Duas novas espécies de Myrcia sect. Reticulosae, M. carassana e M. revoluta, são descritas e ilustradas. Myrcia carassana foi primeiramente reconhecida em 1908 por A.F.M. Glaziou, mas nunca foi validamente publicada. Esta espécie é similar a M. venosissima, diferindo pelos tricomas avermelhados, inflorescências botrioides ou reduzidas a dicásios simples com pedúnculos mais longos, botões florais obcônicos e lobos calicinais densamente pilosos internamente. Myrcia revoluta é similar a M. reticulosa, mas difere pelas lâminas foliares com margens fortemente revolutas, densamente pilosas abaxialmente e inflorescências subterminais subentendidas por folhas reduzidas.

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Acknowledgments

This research was supported by Masters degree (TF) and Post-doctoral (DFL) grants from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior – CAPES (processes n° 88887.177207/2018-00 and #88887.371829/2019-00). TF is especially grateful to Universidade Federal Fluminense and NIT herbarium for providing laboratorial support. We thank Augusto Giaretta, Matheus Santos, Marcos Sobral and Paulo Gaem for valuable discussion, Jair Faria for analyzing materials in the UB herbarium, Olof Ryding from C for providing images, Luís Fernando da Conceição and Clarice Ribeiro, both from RB, for digitizing the holotypes, and João Renato Stehmann from BHCB for permission to reproduce images of specimens. We are also grateful to Benjamin Torke and two anonymous reviewers for their valuable suggestions on the manuscript.

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Authors and Affiliations

  1. Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão, 915, Rio de Janeiro, RJ, 22460-030, Brazil

    Thiago Fernandes & João Marcelo Alvarenga Braga

  2. Programa de Pós-Graduação em Biologia de Fungos, Algas e Plantas, Universidade Federal de Santa Catarina, Florianópolis, SC, 88040-900, Brazil

    Duane F. Lima

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  1. Thiago Fernandes
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  2. Duane F. Lima
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  3. João Marcelo Alvarenga Braga
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Correspondence to Thiago Fernandes.

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Fernandes, T., Lima, D.F. & Braga, J.M.A. Two new species of Myrcia sect. Reticulosae (Myrtaceae) from the campo rupestre of Minas Gerais, Brazil. Brittonia 72, 393–401 (2020). https://doi.org/10.1007/s12228-020-09630-z

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