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<p><i>Marcetia</i> is a very representative genus of Melastomataceae, tribe Marcetieae, which currently includes 38 species, almost endemic to Brazil. Its main center of diversity lies in the Chapada Diamantina, in the central region of Bahia state, which corresponds to the northern portion of the Espinhaço Range and houses more than 90% of <i>Marcetia</i>´s endemism. Species in this genus display several taxonomic problems, as is the case with <i>M. formosa</i>,<i> M. viscida</i> and <i>M. harleyi</i>, which compose the “<i>M. formosa</i>” complex, with intermediate morphotypes endemic to rocky outcrops typical of that region. In order to evaluate species boundaries within this complex, we used multivariate morphometrics in 417 individuals from 22 populations, analyzing 33 quantitative characters (11 vegetative and 22 floral). The discriminant and clustering analyses showed nine main groups, which agreed with the three species mentioned, in addition to six new ones here described. The species are distinguished by both vegetative (habit, branch, leaf and petiole length; leaf base) and floral characters (petiole length; bracteoles shape; length of floral pedicels; length and width of sepals and petals and anther curvature angle). We highlight the value of morphometry within this group and provide an identification key, along with illustrations and distribution maps, for all species. Most species are endemic to the rocky outcrops of Espinhaço Range in Bahia, being endangered with extinction and occurring outside conservation units.</p>

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Morphometrics of the Marcetia formosa complex (Melastomataceae), endemic to the Chapada Diamantina, Brazil: understanding species boundaries and revealing six new species to this genus

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  • 发表日期：

    2026年7月6日

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  • Andrea Karla Almeida dos Santos,
  • Sabrina Mota Lambert,
  • Tânia Regina dos Santos Silva,
  • Alessandra Selbach Schnadelbach,
  • Eduardo Leite Borba,
  • João Paulo Silva Vieira,
  • Reyjane Patrícia de Oliveira

摘要

Marcetia is a very representative genus of Melastomataceae, tribe Marcetieae, which currently includes 38 species, almost endemic to Brazil. Its main center of diversity lies in the Chapada Diamantina, in the central region of Bahia state, which corresponds to the northern portion of the Espinhaço Range and houses more than 90% of Marcetia´s endemism. Species in this genus display several taxonomic problems, as is the case with M. formosa, M. viscida and M. harleyi, which compose the “M. formosa” complex, with intermediate morphotypes endemic to rocky outcrops typical of that region. In order to evaluate species boundaries within this complex, we used multivariate morphometrics in 417 individuals from 22 populations, analyzing 33 quantitative characters (11 vegetative and 22 floral). The discriminant and clustering analyses showed nine main groups, which agreed with the three species mentioned, in addition to six new ones here described. The species are distinguished by both vegetative (habit, branch, leaf and petiole length; leaf base) and floral characters (petiole length; bracteoles shape; length of floral pedicels; length and width of sepals and petals and anther curvature angle). We highlight the value of morphometry within this group and provide an identification key, along with illustrations and distribution maps, for all species. Most species are endemic to the rocky outcrops of Espinhaço Range in Bahia, being endangered with extinction and occurring outside conservation units.