Abstract
Phylogenetic, taxonomic, and biogeographic studies of Mimosa sect. Mimosa ser. Mimosa subser. Polycephalae revealed a new species, Mimosa brevicalyx T.P.Mendes & M.J.Silva (sp. nova), endemic to the savannas of central Goiás State, Brazil. The species is described here, illustrated, compared with related taxa (Mimosa hypoglauca var. hypoglauca, M. hypoglauca var. dawsonii, M. papposa var. papposa, and M. papposa var. segrex), its geographic distribution is mapped, its conservation status, flowering and fruiting times and systematic position is discussed, and images are provided. Additionally, the new species and its related congeners have their phylogenetic positions elucidated and discussed based on molecular phylogenies derived from the union of ITS (nrDNA) and trnD-T (cpDNA) markers and are compared using leaf-anatomical data, including the micromorphology of its trichomes. Trichomes are of extreme importance for determining the taxa considered here, as they show stable and discontinuous differences related to the environments occupied by the species and are therefore all of likely ecological relevance.
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Acknowledgements
We express our thanks to the Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES) for granting a scholarship to the first author; Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq) for the productivity grant (Process No. 307747/2019-0) awarded to M. J. Silva; Cristiano Gualberto for the illustrations, the team at the Electron Microscopy Laboratory of the Physics Department of the Federal University of Goiás (LabMic UFG) for their support in obtaining SEM images.
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ITS and trnD-T data matrix used in the study (PDF 52 kb)
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Mendes, T.P., Simon, M.F., Alonso, A.A. et al. Mimosa brevicalyx (Leguminosae-Caesalpinioideae): a new species based on molecular, anatomical, and morphological data. Plant Syst Evol 307, 32 (2021). https://doi.org/10.1007/s00606-021-01745-4
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DOI: https://doi.org/10.1007/s00606-021-01745-4