Taxonomy of the Nicotiana megalosiphon species complex (Solanaceae; Nicotiana section Suaveolentes): analyses of RADseq data identifies a new cryptic species

Mark W. Chase; Maarten J. M. Christenhusz; Luiz A. Cauz-Santos; Steven Dodsworth; Ruth Palsson; John G. Conran; Felipe Nollet; Rosabelle Samuel

doi:10.1071/SB24021

RESEARCH ARTICLE (Open Access)

Previous Contents Vol 37(6)

Taxonomy of the Nicotiana megalosiphon species complex (Solanaceae; Nicotiana section Suaveolentes): analyses of RADseq data identifies a new cryptic species

Mark W. Chase

^A ^B ^* , Maarten J. M. Christenhusz

^B , Luiz A. Cauz-Santos ^C , Steven Dodsworth

^D , Ruth Palsson

^E , John G. Conran

^F , Felipe Nollet

^G and Rosabelle Samuel

^C

+ Author Affiliations

- Author Affiliations

^A Department of Environment and Agriculture, Curtin University, Bentley, WA 6102, Australia.

^B Jodrell Laboratory, Royal Botanic Gardens, Kew, Richmond, Surrey, TW9 3DS, UK.

^C Department of Botany and Biodiversity Research, University of Vienna, Rennweg 14, Vienna A-1030 Austria.

^D Institute of Structural and Molecular Biology, School of Natural Sciences, Birkbeck, University of London, London, WC1E 7HX, UK.

^E Department of Botany and N.C.W. Beadle Herbarium, University of New England, Armidale, NSW 2351, Australia.

^F Environment Insititute, School of Biological Sciences, The University of Adelaide, Adelaide, SA 5005, Australia.

^G Departamento de Biologia, Universidade Federal Rural de Pernambuco, 52171-900, Recife, Pernambuco, Brazil.

^* Correspondence to: mark.chase@curtin.edu.au, m.chase@kew.org

Handling Editor: Darren Crayn

Australian Systematic Botany 37, SB24021 https://doi.org/10.1071/SB24021

Submitted: 11 July 2024 Accepted: 1 November 2024 Published: 29 November 2024

© 2024 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

The Nicotiana megalosiphon Van Heurck & Müll.Arg. species complex has been shown to be composed of several morphologically cryptic species similar to N. simulans N.T.Burb. Using phylogenetic and population genetic approaches (maximum likelihood, co-ancestry, admixture proportions, Bayesian species delimitation and coalescent methods), we demonstrate that there is an additional undescribed species in this complex. The species limits of N. latifolia M.W.Chase & Christenh., N. latzii M.W.Chase, R.W.Jobson & Christenh., N. megalosiphon, N. sessilifolia (P.Horton) M.W.Chase & Christenh. and N. simulans, previously circumscribed based solely on a phylogenetic approach, are confirmed in the new analyses and a new species, N. palssonae M.W.Chase & Christenh., is described. A map of species distributions and a key to the species of the N. megalosiphon species complex are provided.

Keywords: admixture analysis, Bayesian species delimitation, coalescent methods, cryptic species, flora of eastern Australia, Nicotiana simulans, Nicotianoideae, wild tobacco.

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