An integrative taxonomic approach resolves the Prostanthera lasianthos (Lamiaceae) species complex
Barry J. Conn
A B F , Murray J. Henwood B , Kirstin M. Proft A B C , Judith A. Scott A D , Trevor C. Wilson A and Rod S. Howes E
+ Author Affiliations
- Author Affiliations
A National Herbarium of New South Wales, Mrs Macquaries Road, Sydney, NSW 2000, Australia.
B School of Life and Environmental Sciences, The University of Sydney, NSW 2006, Australia.
C The University of Tasmania, Private Bag 55, Hobart, Tas. 7001, Australia.
D New South Wales Department of Planning, Industry and Environment, 4 Parramatta Square, Parramatta, NSW 2150, Australia.
E Six Sigma Asia Pacific, Ballarat, Vic. 3350, Australia.
F Corresponding author. Email: barry.conn@sydney.edu.au
Australian Systematic Botany 34(5) 438-476 https://doi.org/10.1071/SB20023
Submitted: 2 September 2020 Accepted: 31 March 2021 Published: 8 July 2021
Abstract
The diagnostic characteristics and distinctiveness of plant taxa have traditionally been based on a combination of geographic and morphological discontinuity. Implicit within these concepts is the notion that morphological variation is fixed and that gene flow among taxa is limited. However, species complexes that comprise a range of more-or-less continuous morphotypes often confound such assumptions and resist formal taxonomic treatment. A range of independent data sources, namely, nucleotide sequences, volatile oils and traditional morphology, were used in an integrative approach to resolve the taxonomic structure within the geographically widespread species complex of Prostanthera lasianthos Labill. We concluded that no dataset has primacy in defining segregate taxa, and that a combination of morphological and molecular data was required to determine the taxa within. As a result, we amended the description of P. lasianthos sens. strict. and recognise the following five new segregate species: Prostanthera largiflorens B.J.Conn & K.Proft, P. lasiangustata J.Carrick ex B.J.Conn & K.Proft, P. rupicola B.J.Conn & K.Proft, P. subalpina B.J.Conn & K.Proft, and P. williamsii B.J.Conn & K.Proft.
Keywords: Australia, systematics, taxonomy.
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