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Phylogeny of the Neotropical tribe Jacarandeae (Bignoniaceae)
Author(s) -
Ragsac Audrey C.,
FariasSinger Rosana,
Freitas Loreta B.,
Lohmann Lúcia G.,
Olmstead Richard G.
Publication year - 2019
Publication title -
american journal of botany
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.218
H-Index - 151
eISSN - 1537-2197
pISSN - 0002-9122
DOI - 10.1002/ajb2.1399
Subject(s) - biology , bignoniaceae , monophyly , botany , tribe , subgenus , phylogenetics , phylogenetic tree , genus , clade , biochemistry , sociology , anthropology , gene
Premise The tribe Jacarandeae includes Jacaranda (49 species) and Digomphia (3 species), two genera of trees and woody shrubs with Neotropical distribution. Jacarandeae is sister to the rest of the Bignoniaceae, but not much is known about interspecific and intergeneric relationships within this group. Methods We reconstructed the phylogeny of Jacarandeae using chloroplast ( ndh F, rpl 32‐ trn L, trn L‐F) and nuclear ( ETS , PPR 62) markers. Evolutionary relationships within Jacarandeae were inferred using Bayesian, Maximum Likelihood, and species tree approaches. The resulting phylogenetic framework was used as the basis to interpret the evolution of key morphological character states (i.e., stamen and calyx traits) and revise the infra‐generic classification of the group. Results Jacaranda and Digomphia belong to a well‐supported clade, with Digomphia nested within Jacaranda . We propose the necessary taxonomic changes to recognize monophyletic taxa, including a broadly circumscribed Jacaranda divided into four sections: (1) Jacaranda sect. Nematopogon , species previously included in Digomphia and united by divided staminode apices and spathaceous calyces; (2) Jacaranda sect. Copaia , species with monothecal anthers and cupular calyces; (3) Jacaranda sect. Jacaranda , species with monothecal anthers and campanulate calyces; and (4) Jacaranda sect. Dilobos , species with dithecal anthers and cupular calyces, and including more than half of the species of the genus, all restricted to Brazil. Conclusions As circumscribed here, Jacarandeae includes only a broadly defined Jacaranda divided into four sections. Each section is defined by a unique combination of anther and calyx morphologies.