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

East rarely meets West: a revised delimitation for Pultenaea (Fabaceae: Mirbelieae) with reinstatement of Euchilus and three new genera from south-west Western Australia

Russell L. Barrett https://orcid.org/0000-0003-0360-8321 A B # * , James A. R. Clugston https://orcid.org/0000-0002-3653-6953 A C D # , Lindy A. Orthia E , Lyn G. Cook F , Michael D. Crisp F , Brendan J. Lepschi G , Terry D. Macfarlane https://orcid.org/0000-0002-7023-9231 H , Peter H. Weston A and Carolyn F. Wilkins H I
+ Author Affiliations
- Author Affiliations

A National Herbarium of New South Wales, Botanic Gardens of Sydney, Australian Botanic Garden, Locked Bag 6002, Mount Annan, NSW 2567, Australia.

B Evolution and Ecology Research Centre, School of Biological, Earth and Environmental Sciences, University of New South Wales Sydney, Kensington, NSW 2052, Australia.

C Montgomery Botanical Center, 11901 Old Cutler Road, Coral Gables, FL 33156-4242, USA.

D Hawkesbury Institute for the Environment, Western Sydney University, Locked Bag 1797, Penrith, NSW 2751, Australia.

E School of Sociology, Research School of Social Sciences, College of Arts and Social Sciences, Australian National University, Canberra, ACT 2601, Australia.

F School of Biological Sciences, The University of Queensland, Brisbane, Qld 4072, Australia.

G Australian National Herbarium, Centre for Australian National Biodiversity Research, PO Box 1700, Canberra, ACT 2601, Australia.

H Western Australian Herbarium, Department of Biodiversity, Conservation and Attractions, Locked Bag 104, Bentley Delivery Centre, WA 6983, Australia.

I School of Biological Sciences, Faculty of Science, The University of Western Australia, Crawley, WA 6009, Australia.

# Joint first authors.

Handling Editor: Limin Lu

Australian Systematic Botany 37, SB23029 https://doi.org/10.1071/SB23029
Submitted: 10 November 2023  Accepted: 31 July 2024  Published: 4 September 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 4.0 International License (CC BY-NC)

Abstract

Circumscription of the large genus Pultenaea Sm. has been contentious since shortly after description. We draw on recently generated phylogenomic data to provide a fully resolved phylogeny of Pultenaea and related genera based on near-complete species level sampling for the genus. Phylogenomic data divide Pultenaea sens. lat. into five independent lineages, corresponding to previously identified clades, that we recognise as distinct genera. Pultenaea sens. str. contains most of the currently recognised species and as circumscribed here, all of the species are endemic to eastern Australia except for P. tenuifolia R.Br. & Sims that extends across the Nullarbor into Western Australia. The genus Euchilus R.Br. is reinstated for eight species, all endemic to south-west Western Australia except for E. elachistus (F.Muell.) R.L.Barrett & Orthia that also occurs in South Australia. Three new genera are described, with all of the constituent species endemic to south-west Western Australia: Grievea R.L.Barrett, Clugston & Orthia, with two species, Jennata R.L.Barrett, Clugston & Orthia, with nine species and Loricobbia R.L.Barrett, Clugston & Orthia with six species. Pultenaea adunca Turcz. remains unplaced but we exclude this species from our concept of Pultenaea. Twenty-one new combinations are made: Euchilus aridus (E.Pritz.) R.L.Barrett & Orthia, E. calycinus subsp. proxenus (Orthia & Chappill) Orthia & R.L.Barrett, E. daena (Orthia & Chappill) Orthia & R.L.Barrett, E. elachistus (F.Muell.) R.L.Barrett & Orthia, Grievea brachytropis (Benth. ex Lindl.) R.L.Barrett & Orthia, G. craigiana (C.F.Wilkins, Orthia & Crisp) Orthia & R.L.Barrett, Jennata brachyphylla (Turcz.) R.L.Barrett & Clugston, J. empetrifolia (Meisn.) R.L.Barrett & Clugston, J. ericifolia (Benth.) R.L.Barrett & Clugston, J. indira (Orthia & Crisp) Orthia & R.L.Barrett, J. indira subsp. monstrosita (Orthia) Orthia & R.L.Barrett, J. indira subsp. pudoides (Orthia) Orthia & R.L.Barrett, J. radiata (H.B.Will.) R.L.Barrett & Clugston, J. strobilifera (Meisn.) R.L.Barrett & Clugston, J. verruculosa (Turcz.) R.L.Barrett & Clugston, Loricobbia aspalathoides (Meisn.) R.L.Barrett & T.D.Macfarl., L. ochreata (Meisn.) R.L.Barrett & T.D.Macfarl., L. pauciflora (M.B.Scott) R.L.Barrett & T.D.Macfarl., L. pinifolia (Meisn.) R.L.Barrett & T.D.Macfarl., L. reticulata (Sm.) R.L.Barrett & T.D.Macfarl. and L. skinneri (F.Muell.) R.L.Barrett & T.D.Macfarl.

Keywords: Australia, biodiversity hotspot, bush-peas, new genera, phylogenetic classification, plant taxonomy, south-eastern Australia, systematics, Western Australia.

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