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A new combination in Aulonemia (Poaceae: Bambusoideae: Bambuseae) based on floral analysis, anatomical features, and distribution

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Abstract

Recent bamboo collections from Brazil, and the study of specimens from several Brazilian herbaria revealed that the species described as Eremocaulon setosum, subtribe Guaduineae, in fact fits within the Arthrostylidiinae genus Aulonemia, based on floral and anatomical characters. Several characters found in this species, such as paniculate determinate synflorescences, solitary spikelets, an abaxial marginal green stripe on the foliage leaf blades, absence of stomata on the entire adaxial side of the leaf blade, and intercostal fibers in the mesophyll are typical features of the subtribe Arthrostylidiinae. The new combination Aulonemia setosa is here proposed, an epitype is designated, and a broader distributional range of this species is documented.

Resumo

Recentes coletas de bambus no Brasil e o estudo de espécimes de diversos herbários brasileiros revelaram que a espécie descrita como Eremocaulon setosum, subtribo Guaduineae, enquadra-se na circunscrição do gênero Aulonemia, da subtribo Arthrostylidiinae, com base nas características florais e anatômicas aqui apresentadas. Algumas características desta espécie, tais como sinflorescências em panículas determinadas, espiguetas simples, uma faixa marginal verde escura na face abaxial das folhas de ramos, ausência de estômatos em toda a superfície adaxial da lâmina e presença de fibras intercostais no mesofilo são características típicas da subtribo Arthrostylidiinae. Com base nos dados apresentados, propõe-se aqui a nova combinação Aulonemia setosa e um epítipo é designado. A ampliação da distribuição geográfica desta espécie é também documentada.

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Acknowledgments

P. L. Viana thanks FAPEMIG and CAPES for support in the Doctoral program. E. Paiva is supported by a research grant from CNPq. We thank Dr. Emmet Judziewicz, Dr. Dalva G. Ribeiro, Rosy M. Isaías, Ana P. S. Gonçalves and João R. Stehmann for valuable suggestions on the manuscript. We also thank Myrian M. Duarte for the line drawing. The reviewers Dr. Robert Soreng and Dr. Lynn Clark improved substantially the final version of this paper. Heitor Bispo, Nara F. O. Mota and Felipe S. F. Leite (Miguelão Biodiversity Insights) for their help during fieldwork.

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Authors and Affiliations

  1. Programa de Pós Graduação em Biologia Vegetal, Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, CEP 31270-901, Belo Horizonte, Minas Gerais, Brazil

    Pedro L. Viana

  2. Reserva Ecológica do IBGE, CEP 70312-970, Brasília, Distrito Federal, Brazil

    Tarciso S. Filgueiras

  3. Departamento de Botânica, Instituto de Ciências Biológicas, Universidade Federal de Minas Gerais, CEP 31270-901, Belo Horizonte, Minas Gerais, Brazil

    Elder A. S. Paiva

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  1. Pedro L. Viana
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  2. Tarciso S. Filgueiras
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  3. Elder A. S. Paiva
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Correspondence to Pedro L. Viana.

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Viana, P.L., Filgueiras, T.S. & Paiva, E.A.S. A new combination in Aulonemia (Poaceae: Bambusoideae: Bambuseae) based on floral analysis, anatomical features, and distribution. Brittonia 63, 102–112 (2011). https://doi.org/10.1007/s12228-010-9138-0

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