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Taxonomy, biogeography and evolution of plants
RESEARCH ARTICLE (Open Access)

Generic and infrageneric limits of Phebalium and its allies (Rutaceae: Zanthoxyloideae)

Marco F. Duretto https://orcid.org/0000-0003-1013-4291 A * , Margaret M. Heslewood https://orcid.org/0000-0003-0100-8023 A and Michael J. Bayly https://orcid.org/0000-0001-6836-5493 B
+ Author Affiliations
- Author Affiliations

A National Herbarium of New South Wales, Australian Institute of Botanical Science, Royal Botanic Gardens & Domain Trust, Locked Bag 6002, Mount Annan, NSW 2567, Australia.

B School of BioSciences, The University of Melbourne, Parkville, Vic. 3010, Australia.


Handling Editor: Joeri Strijk

Australian Systematic Botany 36(2) 107-142 https://doi.org/10.1071/SB22018
Submitted: 1 July 2022  Accepted: 27 March 2023   Published: 21 April 2023

© 2023 The Author(s) (or their employer(s)). Published by CSIRO Publishing. This is an open access article distributed under the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License (CC BY-NC-ND)

Abstract

We present a five-locus 129-species phylogeny of Rutaceae from subfamily Zanthoxyloideae, with 193 ingroup samples representing 128 species from all 18 genera in the Eriostemon Group and focus on generic and infrageneric limits in Phebalium and its allies. Maximum parsimony and Bayesian inference analyses were performed using three plastid markers (psbA–trnH, trnL–trnF, rbcL) and two nuclear ribosomal markers (ITS, ETS). Asterolasia, Correa, Diplolaena, Eriostemon, Leionema, Nematolepis and Phebalium are each shown to be monophyletic, reaffirming the results of previous authors. The paraphyly of Rhadinothamnus with respect to Chorilaena is addressed by transferring all taxa of Rhadinothamnus into an expanded Chorilaena and a key to species presented. Microcybe is reduced to synonymy under Phebalium and recognised at a sectional level, with the distinctiveness of M. ambigua recognised by erecting a new monotypic section to accommodate it. The denser sampling of the Eriostemon Group in this study has not improved resolution among genera; there is little support for most relationships among genera, a finding similar to that of previous authors. New sectional classifications with keys are presented for Asterolasia, Leionema, Nematolepis and Phebalium.

Keywords: Asterolasia, Australasia, Chorilaena, Correa, Crowea, Diplolaena, Drummondita, Eriostemon, Geleznowia, Halfordia, Leionema, Microcybe, molecular phylogenetics, Muiriantha, Myrtopsis, Nematolepis, Neoschmidia, Phebalium, Philotheca, plant systematics, Rhadinothamnus, Rutaceae, taxonomy.


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