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Issue: Vol. 655 No. 2: 25 Jun. 2024
Type: Article
Published: 2024-06-25
DOI: 10.11646/phytotaxa.655.2.6
Page range: 187-198
Abstract views: 71
PDF downloaded: 1

Phylogenetic placement of Mimosa pabstiana reinforces a biogeographic pattern of the Pleistocene Arc Theory in Mimosa (Leguminosae, Caesalpinoideae)

Programa de Pós-Graduação em Botânica, Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 915, CEP: 22460-030, Rio de Janeiro, RJ, Brazil
Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 915, CEP: 22460-030, Rio de Janeiro, RJ, Brazil
Embrapa Recursos Genéticos e Biotecnologia, Parque Estação Biológica–PqEB, 70770-901, Brasília, DF, Brazil
Embrapa Recursos Genéticos e Biotecnologia, Parque Estação Biológica–PqEB, 70770-901, Brasília, DF, Brazil
Instituto de Pesquisas Jardim Botânico do Rio de Janeiro, Rua Pacheco Leão 915, CEP: 22460-030, Rio de Janeiro, RJ, Brazil
Fabaceae merism Mimosoid Mimosoideae systematics taxonomy trymery seasonally dry tropical forest Eudicots

Abstract

New molecular evidence derived from the trnD-T region has unveiled an unexpected relationship for Mimosa pabstiana. Traditionally classified within M. sect. Batocaulon ser. Campicolae, our phylogenetic study reveals its new placement within M. sect. Batocaulon ser. Andinae. This discovery aligns with a biogeographic pattern consistent with the Pleistocene Arc Theory, encompassing inter-Andean valleys, the Chaco, Central-West Brazil, and Brazilian seasonally dry forests. Recent observations of M. pabstiana in Brazilian herbaria, along with newly collected field samples documented through photography and georeferencing, bring forth additional data about this poorly-known species. We further elucidate the phylogenetic placement of M. paraibana, previously hypothesized to have a close relationship with M. pabstiana.

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