A new species of Tanaecium (Bignonieae, Bignoniaceae) from the Brazilian Amazon and its phylogenetic placement


Tanaecium (Bignonieae, Bignoniaceae) is a genus of Neotropical lianas that is centered in the Amazon. The genus exhibits interesting patterns of morphological variation, especially in terms of flower morphology. Despite that, the group remains poorly known, lacks a phylogeny and a taxonomic revision. While working on the systematics of Tanaecium, we encountered a morphological variant of Tanaecium pyramidatum from the Brazilian Amazon that represents an independent evolutionary lineage and differs from that species in various morphological traits. This taxon is here described as Tanaecium decorticans, sp. nov. While T. decorticans is sister and most morphologically similar to T. pyramidatum, it differs in the peeling epidermis (vs. not peeling in T. pyramidatum), presence of an arrow-shaped petiolule (vs. absence of an arrow-shaped petiolule in T. pyramidatum), and interpetiolar region covered with fields of glandular trichomes (vs. aglandular interpetiolar region in T. pyramidatum), among other characters. This finding highlights the importance of in-depth taxonomic studies of individual lineages for an improved understanding of the Amazonian biodiversity.

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The authors thank the curators of the INPA and SPF herbaria for allowing us to examine specimens. We also thank Augusto Giaretta, Jéssica Francisco, Leandro Giacomim, and Hélcio de Souza for assistance during fieldwork, André Carvalho for assistance with the preparation of the distribution map, Klei Sousa for illustrating T. decorticans, and Beatriz Gomes for comments on an earlier version of the manuscript.


Coordenação de Aperfeiçoamento de Pessoal de Nível Superior (CAPES)—Finance Code 001, 1525151, Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq, 142224/2015-4, 310871/2017-4), Fundação de Amparo à Pesquisa do Estado de São Paulo (FAPESP 2011/50859-2, 2012/50260-6, 2015/10914-5), International Association for Plant Taxonomy (IAPT 2016), Systematic Research Fund (SRF 2016), Society of the Systematic Biologists (SSB 2017).

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Correspondence to Annelise Frazão or Lúcia G. Lohmann.

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Frazão, A., Lohmann, L.G. A new species of Tanaecium (Bignonieae, Bignoniaceae) from the Brazilian Amazon and its phylogenetic placement. Plant Syst Evol 304, 1245–1253 (2018). https://doi.org/10.1007/s00606-018-1544-x

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  • Amazonia
  • Lianas
  • Neotropical biodiversity
  • Taxonomy