Phylogeny of the Neotropical legume genera Zygia and Marmaroxylon and close relatives

Abstract

The Neotropical legume genera Zygia and Marmaroxylon have traditionally been considered closely related and are sometimes treated as congeners. They have been referred to the mimosoid tribe Ingeae based on their possession of flowers with basally fused stamen filaments. However, their systematic status and position have not been analysed in a phylogenetic context. This study provides the first molecular phylogeny of Zygia and Marmaroxylon and closely related mimosoid legume genera, particularly from the tribe Ingeae. DNA sequence data were derived from the nuclear external transcribed spacer (ETS) and the internal transcribed spacer (ITS), and from the chloroplast psbA-trnH and trnL-trnF regions, and were analysed using Bayesian inference. In all, 29 species of Zygia and 7 species of Marmaroxylon were included in the study along with representative species from the closely related genera Abarema, Acacia

Hybrid capture of 964 nuclear genes resolves evolutionary relationships in the mimosoid legumes and reveals the polytomous origins of a large pantropical radiation

“…At generic level within the mimosoids, it has been clear for some time that despite significant progress, further generic re‐delimitation is needed to account for the non‐monophyly of several genera (Luckow et al, 2003; Brown et al, 2008; Iganci et al, 2016; Ferm et al, 2019; É. R. de Souza et al, unpublished data). Our results add to this tally of non‐monophyletic mimosoid genera.…”

“…With a dysfunctional tribal classification, generic affinities have increasingly been referred to informally named clades (e.g., Hughes et al, 2003) and informal generic groups (Lewis et al, 2005) or alliances (Barneby and Grimes, 1996). Generic delimitation remains frustrated by what appears to be extensive morphological homoplasy and lack of phylogenetic resolution, and many genera remain poorly defined and have been suspected or shown to be non‐monophyletic; examples include Archidendron (Brown et al, 2008), Prosopis (Catalano et al, 2008), Abarema (Iganci et al, 2016), Stryphnodendron (Simon et al, 2016), and Zygia (Ferm et al, 2019). This has been especially the case for tribe Ingeae, for which different authors have proposed starkly discordant generic systems (e.g., Nielsen, 1981; Lewis and Rico Arce, 2005; Barneby and Grimes, 1996; reviewed by Brown, 2008).…”

Phylogeny of the ingoid clade (Caesalpinioideae, Fabaceae), based on nuclear and plastid data

“…2006) and amplifications were carried out as follows: 3-min initial denaturation at 95 °C followed by 35 cycles of 1-min denaturation at 95 °C, 1-min annealing at 55 °C and 1-min extension at 72 °C, and completed by a final extension of 7 min at 72 °C. Nuclear ribosomal ITS was amplified in two separate reactions using the primers P17 (Popp & Oxelman 2001) + ITS 491 (Ferm & al. 2019) and ITS 493 (Ferm & al.…”

“…2010; Miller & Seigler 2012), or on some of the alliances of the (former) tribe Ingeae (e.g., Iganci & al. 2016; Ferm & al. 2019; Koenen & al.…”

Filogenia de Lysiloma (Fabaceae), un género restringido a Megaméxico con especies atípicas en las Antillas y Florida

“…Assessing the monophyly of Lysiloma is particularly relevant since two related genera studied from a molecular perspective were non-monophyletic: Abarema Pittier (Iganci et al, 2015), and Zygia P. Brown (Ferm et al, 2019). Aiming at testing the monophyly and sister-group relationships of Lysiloma, we performed phylogenetic analyses combining morphological and molecular datasets.…”