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

Molecular and morphological analyses support recognition of Prostanthera volucris (Lamiaceae), a new species from the Central Tablelands of New South Wales

Ryan P. O’Donnell https://orcid.org/0000-0003-0412-5874 A B E * , Jeremy J. Bruhl https://orcid.org/0000-0001-9112-4436 A , Ian R. H. Telford https://orcid.org/0000-0002-3570-0053 A , Trevor C. Wilson https://orcid.org/0000-0002-9026-0521 B , Heidi C. Zimmer https://orcid.org/0000-0002-8496-7360 C , Guy M. Taseski https://orcid.org/0000-0003-2243-3408 D and Rose L. Andrew https://orcid.org/0000-0003-0099-8336 A *
+ Author Affiliations
- Author Affiliations

A Botany and N.C.W. Beadle Herbarium, School of Environmental and Rural Science, University of New England, Armidale, NSW 2351, Australia.

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

C Australian National Herbarium, Centre for Australian National Biodiversity Research, GPO Box 1700, Canberra, ACT 2601, Australia.

D John T. Waterhouse Herbarium, School of Biological, Earth and Environmental Sciences, University of New South Wales, Kensington, NSW 2052, Australia.

E Present address: Division of Ecology and Evolution, Research School of Biology, The Australian National University, Canberra, ACT 2600, Australia.


Handling Editor: Limin Lu

Australian Systematic Botany 36(1) 1-20 https://doi.org/10.1071/SB22017
Submitted: 20 June 2022  Accepted: 8 January 2023   Published: 8 February 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

Research into the systematics of Prostanthera recently revealed close evolutionary relationship among P. phylicifolia sens. str., the critically endangered P. gilesii, and a population of uncertain identity from the Central Tablelands of New South Wales (NSW), Australia. Previous analyses were unable to establish whether genetic boundaries separated these taxa. This study assessed species boundaries among these three taxa by using a combination of single-nucleotide polymorphisms (SNPs) sampled at the population-scale and multivariate analysis of morphological characters. Ordination, model-based clustering, F-statistics, neighbour-network analysis, phylogenetic analysis, and ancestry coefficient estimates all provided support for discrete genetic differences among the three taxa. Morphological phenetic analysis recovered congruent morphological clusters and identified a suite of corresponding diagnostic characters. This congruence of molecular and morphological evidence supports the presence of three independently evolving lineages, two of which correspond with the previously described P. gilesii and P. phylicifolia sens. str. The third taxon, represented by a single population from the Central Tablelands of NSW, is here described as P. volucris R.P.O’Donnell. A detailed description, diagnostic line drawings and photographs are provided. We evaluate P. volucris as satisfying criteria to be considered Critically Endangered.

Keywords: critically endangered, DArTseq, genotyping-by-sequencing, Lamiaceae, population genomics, species delimitation, systematics, taxonomy.


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