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Miconia rondoniensis (Melastomataceae), a new species from the Southern Amazon of Brazil

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Abstract

Miconia rondoniensis occurs in secondary upland (terra firme) moist open forest in the Brazilian states of Rondônia, Mato Grosso and Amazonas. It can be recognized by the tree habit, large leaves with rounded to obtuse or subcordate bases and 5+2 basal veins (five main veins plus a faint submarginal pair), large inflorescences with proximal paraclades bearing quaternary branches and distal paraclades bearing tertiary branches, persistent hemi-elliptic bracteoles, short persistent calyx lobes, and capitate stigmas. The most striking feature of this new species is the thick pubescence on the branches and petioles, composed of trichomes having a long axis and short arms at the base, but inflated and lacking arms at the apex, resulting in a sorus-like surface covered with globose structures.

Resumo. Miconia rondoniensis ocorre em floresta ombrófila aberta em terra firme, nos estados de Rondônia, Mato Grosso e Amazonas. Ela pode ser reconhecida pelo hábito arbóreo, folhas grandes com base arredondada a obtusa ou subcordada e 5+2 nervuras basais (cinco principais nervuras mais um par tênue submarginal), inflorescências grandes, com ramos quaternários nos paracládios proximais ou terciários nos paracládios distais, bractéolas hemielípticas, persistentes, cálice curto, persistente e estigmas capitadas. A característica mais marcante desta nova espécie é a camada espessa do indumento sobre os ramos e pecíolos, com tricomas com eixo longo e ramos curtos na sua base, mas inflados e sem ramos no seu ápice, resultando em uma superfície com aspecto de soros, coberta com estruturas globosas.

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Acknowledgments

We thank the Programa de Capacitação Institucional (MPEG/MCTI) for the grant received by the first author, Diana Carneiro for the drawings and Fabián Michelangeli for help with the SEM in the Structural Botany Laboratory at The New York Botanical Garden. JM also received grants in the years between 2011 and 2015 from the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior-CAPES (Ph.D. and “Doutorado Sanduíche”, DEB 12599-123) and the PBI Miconieae project (DEB-0818399); RG received a grant from the Conselho Nacional de Pesquisas-CNPQ (“Produtividade em Pesquisa”). The REFLORA program funded JM’s visit to European collections.

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Authors and Affiliations

  1. Programa de Capacitação Institucional, Museu Paraense Emílio Goeldi, Coordenação de Botânica, Av. Perimetral 1901, Belém, PA, 66077-830, Brazil

    Julia Meirelles

  2. Diretoria de Gestão da Biodiversidade, Instituto de Desenvolvimento Florestal e da Biodiversidade do Estado do Pará, Av. João Paulo II, s/n, Belém, Pará, 66610-770, Brazil

    Carlos Renato Boelter

  3. Departamento de Botânica, Centro Politécnico, Universidade Federal do Paraná, Caixa Postal 19031, 81531-970, Curitiba, Paraná, Brazil

    Renato Goldenberg

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  1. Julia Meirelles
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  2. Carlos Renato Boelter
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  3. Renato Goldenberg
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Correspondence to Julia Meirelles.

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Meirelles, J., Boelter, C.R. & Goldenberg, R. Miconia rondoniensis (Melastomataceae), a new species from the Southern Amazon of Brazil. Brittonia 69, 470–476 (2017). https://doi.org/10.1007/s12228-017-9480-6

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