ORCID Profile
0000-0003-3816-7933
Current Organisation
University of Adelaide
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Publisher: Wiley
Date: 02-05-2022
DOI: 10.1002/TAX.12742
Abstract: In a recent article electronically published in Taxon as a “Point of View” in 2021 (and subsequently in hardcopy as a “Perspective” in 2022), Gideon F. Smith and Estrela Figueiredo commented on the undesirability of the continued commemoration of people of severely questionable ethics, including the imperialist Cecil John Rhodes (1853–1902), in botanical nomenclature. Independently addressing a similar topic at around the same time, Timothy A. Hammer and Kevin R. Thiele published proposals to amend Articles 51 and 56 and Division III of the Code , to allow the considered rejection of culturally offensive and inappropriate names. Subsequently, widely circulated responses to Smith & Figueiredo (2022) and Hammer & Thiele (2021) severely misrepresented our positions and views. We here respond to allegations that what we proposed will damage plant nomenclature, and clarify and further substantiate our views.
Publisher: Magnolia Press
Date: 10-05-2019
DOI: 10.11646/PHYTOTAXA.403.2.1
Abstract: A new species of Limonium from Namaqualand coast, South Africa is here described and named L. dagmarae. Shared morphological characters with related South African species place the new species within L. sect. Circinaria. Evidence is presented to segregate the new species from relatives based on discrete morphological and environmental characters. The holotype of the L. dagmarae is preserved at NBG.
Publisher: Wiley
Date: 12-2021
DOI: 10.1002/TAX.12620
Publisher: Elsevier BV
Date: 02-2021
Publisher: Wiley
Date: 18-10-2022
DOI: 10.1002/TAX.12821
Abstract: Recent proposals to amend the International Code of Nomenclature for algae, fungi, and plants (the Code ) to allow the rejection of names that honour historical in iduals who committed crimes against humanity has sparked a counter‐reaction that we believe misrepresents both the intent and mechanism of the proposals. In this short paper we point out errors and fallacious reasoning in this counter‐reaction, and again make the case that an open, balanced, modest, structured, and defensible way to deal with this issue is now, through sensible and reasonable proposals to amend the Code , within the grasp of the taxonomic and nomenclatural community. Adopting these proposals would represent a small but significant contribution to helping address some egregious historical wrongs.
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 17-05-2018
DOI: 10.58828/NUY00877
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 21-08-2014
DOI: 10.58828/NUY00712
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 13-12-2018
DOI: 10.58828/NUY00899
Publisher: Atlas of Living Australia
Date: 16-11-2022
DOI: 10.54102/AJT.AI521
Abstract: The new species Hibbertia advena T.Hammer & Toelken is described. It occurs in north-east Queensland but shares a strong morphological affinity with members of the H. exasperata (Steud.) Briq. species group, which are widespread in south-west Western Australia. This may be an ex le of a very wide transcontinental disjunction in Australian Hibbertia. The biogeographic significance of such disjunctions is briefly discussed, pending further insights when a more complete molecular phylogeny of the genus is generated.
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 26-10-2017
DOI: 10.58828/NUY00853
Publisher: CSIRO Publishing
Date: 14-09-2021
DOI: 10.1071/SB21012
Abstract: In the present study, we tested the chronological and geographic origins of the mostly arid Australian Ptilotus (Amaranthaceae) and its close relatives (i.e. the ‘aervoids’) by reconstructing a dated phylogeny with near-comprehensive s ling for Ptilotus and estimating ancestral geographic ranges. We investigated climatic niche evolution within Ptilotus and identified likely climatic origins and subsequent niche shifts by reconstructing ancestral states of climatic variables on the phylogeny, which was visualised using a phyloecospace approach. Geospatial analyses were employed to identify probable ersification hotspots within Australia. We inferred that the aervoids originated in Oligocene Africa–Asia and that Ptilotus arrived in northern Australia by dispersal in the Early Miocene. Subsequent ersification of Ptilotus was rapid, giving rise to all major clades in the western Eremaean by the time of an aridification pulse in the Middle Miocene. Climatic niche shifts from the arid Eremaean into monsoonal northern and temperate southern Australia are apparent for multiple independent species groups. Our analyses support the hypothesis that a pre-adaptation to aridity and early arrival in an aridifying Australia were integral to the success of Ptilotus, and that the Eremaean has been a source of bio ersity in the genus and for independent radiations into neighbouring climatic zones.
Publisher: The University of Western Australia
Date: 2019
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 13-07-2018
DOI: 10.58828/NUY00893
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 13-12-2016
DOI: 10.58828/NUY00794
Publisher: Atlas of Living Australia
Date: 25-09-2022
DOI: 10.54102/AJT.945NM
Abstract: The south-west Western Australian species Hibbertia striata (Steud.) K.R.Thiele was reinstated in 2017, segregated from the historically misunderstood H. huegelii (Endl.) F.Muell. Since that time, field work has shown that H. striata comprises two distinctly different morphotypes. Plants from the eastern (drier) edge of the range are consistently single-stemmed at the base and are obligate reseeders after fire and other disturbances, in contrast to a more widespread morphotype (which includes the type of H. striata), that is abundantly multi-stemmed from the base and is a resprouter after fire. The difference in habit is consistent, has been observed at multiple locations and is consistently associated with distinct (though subtle) differences in leaf indumentum and morphology. The two morphotypes have not been found growing in mixed populations, due to habitat differences. Field work has shown that they are narrowly sympatric and do not intergrade where they approach each other for this reason, and the consistency of both morphotypes over a wide range, they are regarded here as distinct species. The reseeding taxon has a validly published name, H. huegelii (Endl.) F.Muell. var. subvillosa Domin, and this is raised here to species rank as Hibbertia subvillosa (Domin) K.R.Thiele & T.Hammer.
Publisher: CSIRO Publishing
Date: 08-05-2019
DOI: 10.1071/SB18065
Abstract: Ptilotus macrocephalus (R.Br.) Poir. (Amaranthaceae), commonly known as a featherhead, is a widespread and common species in many parts of Australia. In the present study, we assess morphological variation in P. macrocephalus throughout its geographic range and provide evidence for the recognition of two new species, namely, P. psilorhachis T.Hammer & R.W.Davis and P. xerophilus T.Hammer & R.W.Davis. Geospatial analyses indicated that these new species are partitioned ecologically and geographically.
Publisher: Department of Biodiversity, Conservation and Attractions
Date: 16-03-2017
DOI: 10.58828/NUY00821
Publisher: Atlas of Living Australia
Date: 10-07-2023
DOI: 10.54102/AJT.CR6CH
Abstract: Hibbertia priceana is a rare species found in two localised areas in southern south-western Western Australia, near Ongerup and in the vicinity of Wickepin and Harrismith. Two new species that are morphologically similar to H. priceana but are disjunct and distinct from it are described in this paper. Hibbertia hapalophylla is a new, potentially geographically restricted and rare species first collected during botanical surveys for a mining project near Mount Holland in the Western Australian Goldfields. It was initially collected from, and only known from, disturbed areas on an active mine site, but larger populations were subsequently discovered on a nearby sandplain, from where is was likely introduced to the mine site on sand transported for construction purposes. The second new species, Hibbertia remanens, appears to be restricted to small areas of remnant vegetation near Cunderdin and Kellerberrin in the Western Australian wheatbelt. The three species differ mainly in their leaf shapes in section, with H. priceana having flat leaves with the abaxial lamina fully exposed, H. remanens having recurved leaf margins with the abaxial shallowly grooved either side of the midrib, and H. hapalophylla having strongly revolute margins with the abaxial lamina surface concealed within lacunae formed between the margins and midrib.
Publisher: CSIRO Publishing
Date: 2020
DOI: 10.1071/BT19188
Abstract: Species in the Australian genus Ptilotus (Amaranthaceae) grow well in soils with both very low and very high phosphorus (P) availability in the latter they hyperaccumulate P. However, it is not known whether this trait is common within Ptilotus, whether it is shared with other genera in the family, or whether it correlates with the wide array of morphologies and ecologies within Ptilotus. We therefore assessed P hyperaccumulation across the morphological, ecological and phylogenetic ersity of Ptilotus. Experiment 1 tested the response of 11 species to added P (0, 50 and 100 mg kg–1), including six species of Ptilotus and the Australian amaranth Gomphrena canescens R.Br. Experiment 2 tested the response of five species – three Ptilotus spp., G. canescens and Kennedia prostrata R.Br. – to added P (5 and 150 mg kg–1) and two pre-harvest P-pulse treatments (5 and 50 mg kg–1). Ptilotus species hyperaccumulated P when grown in high-P soil, but curtailed uptake from a pulse. All Ptilotus species preferentially allocated P to leaves (reaching 73 mg g–1) without development of P toxicity symptoms. Gomphrena canescens and K. prostrata preferentially allocated P to stems and roots, respectively, and suffered P toxicity. The lack of tolerance to high [P] in G. canescens suggests that the likely widespread, or universal, mechanisms for tolerance of high P by Ptilotus are not shared by amaranths. Further research will determine the mechanisms underlying the unusual P physiology of Ptilotus.
Publisher: Wiley
Date: 05-04-2022
DOI: 10.1002/TAX.12715
Abstract: The complex publication history of Hibbertia subg. Hemistemma (Juss. ex Thouars) J.W.Horn is discussed, in particular the different editions of Du Petit‐Thouars's books on the plants of Madagascar, and it is concluded that the basionym Hemistemma Juss. ex Thouars was published in 1806 with that spelling and authorship. A type is designated for the name as well as for the synonym Pleurandra Labill.
Publisher: Wiley
Date: 05-2015
DOI: 10.12705/642.6
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/SB17026
Abstract: Ptilotus R.Br. (Amaranthaceae) is a widespread and species-rich Australian genus. One of the most common arid species, Ptilotus gaudichaudii (Steud.) J.M.Black (paper foxtail), currently comprises the following three subspecies: subsp. gaudichaudii, subsp. eremita (S.Moore) Lally and subsp. parviflorus (Benth.) Lally. In the present study, we re-evaluate the morphological basis for the recognition and status of infraspecies in P. gaudichaudii. Evidence from herbarium and field observations supports the reinstatement of Ptilotus gaudichaudii subsp. eremita and subsp. parviflorus to the rank of species as P. eremita (S.Moore) T.Hammer & R.W.Davis and P. modestus T.Hammer respectively.
Publisher: Atlas of Living Australia
Date: 12-02-2023
DOI: 10.54102/AJT.ZUMNQ
Abstract: There has been historical confusion and error in the application and typification of the name Pleurandra glaucophylla Steud., likely caused by a slip of the pen on the original collecting label which caused the collecting number assigned by Preiss (2179) to be mis-transcribed as 2159, a number already used for another Preiss collection. We show that the type of P. glaucophylla falls within the circumscription of the species currently known as Hibbertia rupicola (S.Moore) C.A.Gardner, necessitating the new combination H. glaucophylla (Steud.) K.R.Thiele & T.Hammer as the correct name for the species currently known as H. rupicola.
Publisher: CSIRO Publishing
Date: 2020
DOI: 10.1071/SB19024
Abstract: A detailed study of taxonomic features of the Eriochilus dilatatus (Orchidaceae) complex (white bunny orchids) in Western Australia found that there were no consistent differences among most subspecies when herbarium specimens or living plants were compared. These subspecies were originally segregated primarily by differences in leaf size and shape and the number of flowers produced, but a critical examination of herbarium specimens found that these features were highly inconsistent within taxa. These features were also found to be highly variable over time and space within populations of living plants. The distribution patterns, habitat preferences and flowering times of these taxa were found to overlap, even for subspecies brevifolius and orientalis, which occupy the northern and eastern limits of the distribution of this species. Eriochilus dilatatus subsp. magnus and subsp. multiflorus were shown to be synonyms of subsp. dilatatus, whereas subsp. undulatus and subsp. orientalis are synonymised under subsp. brevifolius. As a result of this study, the two recognised subspecies are subsp. dilatatus and subsp. brevifolius, which can be readily separated by plant height, flower numbers and leaf morphology, except for a few intermediate plants where ranges overlap. New keys and descriptions to these taxa are provided. The reasons for previous taxonomic confusion in this group and in many other Western Australian orchids are discussed and research approaches to resolve these issues are suggested.
Publisher: CSIRO Publishing
Date: 2018
DOI: 10.1071/SB17062
Abstract: A molecular study on Ptilotus nobilis (Lindl.) F.Muell. var. nobilis and P. exaltatus Nees var. exaltatus led to the conclusion that these taxa are conspecific, resulting in the synonymisation of the latter under the former as P. nobilis subsp. nobilis. In this study, we test previous taxonomic concepts in the P. nobilis–P. exaltatus species group by examining (1) the morphology of specimens in the herbarium and field, and (2) ecological and geographic partitioning of two widespread and broadly sympatric taxa in the group, using Maxent and CART models. We provide strong evidence supporting the reinstatement of P. exaltatus as distinct from P. nobilis, on the basis of multiple morphological characters and strong ecological and geographic partitioning, the latter showing how large-scale ecological data can be used to help resolve taxonomic issues. In addition, we raise P. nobilis subsp. angustifolius (Benl) Lally & W.R.Barker to the rank of species as P. angustifolius (Benl) T.Hammer and reinstate P. semilanatus (Lindl.) F.Muell. ex J.M.Black.
Publisher: Wiley
Date: 04-2019
DOI: 10.1002/TAX.12054
Publisher: Magnolia Press
Date: 08-02-2017
DOI: 10.11646/PHYTOTAXA.295.2.5
Abstract: A new monotypic genus from near-coastal areas of Oman and Yemen is here described and named Wadithamnus. The generitype is Wadithamnus artemisioides comb. nov. (basionym Aerva artemisioides). On the basis of morphology, W. artemisioides can be separated from Aerva on the basis of its 3(–7)-flowered cymes and flowers with two outer and four inner tepals, and four stamens alternating with the inner tepals. Molecular data (nuclear ITS and chloroplast trnK–matK sequences) confirm Wadithamnus as a distinct genus outside Aerva, the latter marker placing it at a basal position to the achyranthoid clade. The name Aerva artemisioides is lectotypified on a specimen preserved at WU.
Start Date: 2021
End Date: 2023
Funder: Australasian Systematic Botany Society
View Funded ActivityStart Date: 2020
End Date: 2023
Funder: Australian Biological Resources Study
View Funded Activity