Morphological and molecular evidence refute a broad circumscription for Pultenaea glabra (Fabaceae: Mirbelieae), with implications for taxonomy, biogeography, and conservation
Matthew A. M. Renner
A C , Russell L. Barrett A * , Steve Clarke B , James A. R. Clugston A , Trevor C. Wilson A and Peter H. Weston A
+ Author Affiliations
- Author Affiliations
A National Herbarium of New South Wales, Royal Botanic Gardens and Domain Trust, Australian Botanic Garden, Locked Bag 6002, Mount Annan, NSW 2567, Australia.
B Blaxland East, Blue Mountains, NSW 2774, Australia.
C Present address: Wildland Consultants, 99 Sala Street, Te Ngae, Rotorua, New Zealand.
Australian Systematic Botany 35(3) 225-277 https://doi.org/10.1071/SB21030
Submitted: 6 August 2021 Accepted: 23 May 2022 Published: 14 July 2022
© 2022 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
Morphological and single-nucleotide polymorphism data support splitting Pultenaea glabra Benth. into eight species, including one in Victoria, and seven in eastern and northern New South Wales. Six species are newly described, five of which are, like P. glabra, narrow-range endemics within the Greater Blue Mountains World Heritage Area and adjacent sandstone landforms of the Great Dividing Range. The recognition of six new species from what was broadly P. glabra has implications for conservation management, including for P. glabra itself, which has a smaller distribution and more precise habitat requirements than previously thought. One of the new species, P. percussa, is known by a single 1971 gathering only. The occurrence of several narrow-range Blue Mountains endemic Pultenaea species may be explained by the combination of edaphic diversity and topographic complexity, which could act in concert to promote divergences among small, allopatric populations. Hybrids between P. glabra and P. flexilis Sm. are documented for the first time; however, limited evidence for introgression between the two species was observed. The following new taxa are described: Pultenaea aculeata M.A.M.Renner, P.H.Weston & S.Clarke, Pultenaea percussa M.A.M.Renner & P.H.Weston, Pultenaea furcata M.A.M.Renner & R.L.Barrett, Pultenaea mutabilis M.A.M.Renner & P.H.Weston, Pultenaea mutabilis var. angusta M.A.M.Renner, P.H.Weston, & S.Clarke, Pultenaea praecipua M.A.M.Renner & P.H.Weston, Pultenaea praecipua subsp. temperata M.A.M.Renner & R.L.Barrett, and Pultenaea tenebrosa M.A.M.Renner, P.H.Weston & S.Clarke. Lectotypes are designated for Pultenaea villosa var. glabrescens Benth. and Pultenaea weindorferi Reader.
Keywords: Australia, New South Wales, plant taxonomy, rare species, sandstone flora, short-range endemics, speciation, systematics, Victoria.
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