Timothy Hammer

Timothy Hammer

School of Biological Sciences

Faculty of Sciences, Engineering and Technology

My current position is Postdoctoral Research Fellow in the Waycott Lab (School of Biological Sciences) and Research Associate at the State Herbarium of South Australia.

My current research is focused on the evolution, systematics and taxonomy of the plant family Dilleniaceae, and specifically the Australian species of Hibbertia (currently > 300 species).

My current project is delivering a revisionary taxonomic treatment for the Australian members of Dilleniaceae and Hibbertia (the first since 1863). The taxonomic treatment will be delivered in species and genus profiles and published on the Flora of Australia platform (https://profiles.ala.org.au/opus/foa). In addition to species profiles, comprehensive identification keys for all recognised taxa are being constructed and will be made available online for the public (see https://keybase.rbg.vic.gov.au/keys/show/11717). Phylogenomics methods are also being used to resolve the evolutionary tree of Hibbertia and to use this phylogeny to study the its historical biogeography and floral character evolution. I am also working on describing new Hibbertia species and revising the taxonomy and/or nomenclature of existing species.

I am also collaborating on projects focused on the systematics and taxonomy of various plant groups, including Ptilotus (Amaranthaceae), Gomphrena (Amaranthaceae) and Swainsona (Fabaceae).

  • Journals
    Year Citation
    2022 Kellermann, J., Hammer, T. A., & Toelken, H. R. (2022). Uncovering the correct publication date, spelling and attribution for the basionym of Hibbertia subg. Hemistemma (Dilleniaceae). Taxon, 5 pages.
    DOI
    2022 Hammer, T., & Thiele, K. (2022). Hibbertia archeri (Dilleniaceae), a new and rare species from Western Australia with transcontinental affinities. Swainsona, 36, 67-70.
    2022 Smith, G. F., Figueiredo, E., Hammer, T. A., & Thiele, K. R. (2022). Dealing with inappropriate honorifics in a structured and defensible way is possible. Taxon, 3 pages.
    DOI
    2021 Hammer, T., & Davis, R. (2021). Ptilotus crinitus (Amaranthaceae), a new species from Western Australia’s Kimberley region. Swainsona, 35, 55-58.
    2021 Davis, R., Palmer, J., & Hammer, T. (2021). Gomphrena axillaris and G. longistyla (Amaranthaceae), new species of Gomphrena from central and northern Australia. Swainsona, 35, 59-64.
    2021 Hammer, T. A., Renton, M., Mucina, L., & Thiele, K. R. (2021). Arid Australia as a source of plant diversity: the origin and climatic evolution of Ptilotus (Amaranthaceae). Australian Systematic Botany, 34(6), 570-586.
    DOI
    2021 Hammer, T. A., & Thiele, K. R. (2021). (119–122) Proposals to amend Articles 51 and 56 and Division III, to allow the rejection of culturally offensive and inappropriate names. Taxon, 70(6), 1392-1394.
    DOI Scopus2 WoS2
    2021 Ye, D., Clode, P. L., Hammer, T. A., Pang, J., Lambers, H., & Ryan, M. H. (2021). Accumulation of phosphorus and calcium in different cells protects the phosphorus-hyperaccumulator Ptilotus exaltatus from phosphorus toxicity in high-phosphorus soils. Chemosphere, 264(1), 128438-1-128438-12.
    DOI Scopus2 WoS2
    2020 Brundrett, M. C., & Hammer, T. A. (2020). The Eriochilus dilatatus (Orchidaceae) complex in Western Australia: Subspecies taxonomy is not supported by consistent differences in morphology or distribution. Australian Systematic Botany, 33(4), 329-345.
    DOI Scopus1
    2020 Hammer, T. A., Ye, D., Pang, J., Foster, K., Lambers, H., & Ryan, M. H. (2020). Mulling over the mulla mullas: revisiting phosphorus hyperaccumulation in the Australian plant genus Ptilotus (Amaranthaceae). Australian Journal of Botany, 68(1), 63-74.
    DOI Scopus2 WoS1
    2020 Hammer, T. A., Davis, R. W., & Thiele, K. R. (2020). Clarification of species boundaries within the Ptilotus royceanus Benl (Amaranthaceae) group. Austrobaileya, 10(4), 628-638.
    2020 Davis, R., & Hammer, T. (2020). A key to the species of Swainsona (Fabaceae) in Western Australia and description of S. katjarra from the Little Sandy Desert region, Western Australia. Swainsona, 33, 143-148.
    2020 Hammer, T. (2020). Taxonomic evaluation of Ptilotus manglesii (Amaranthaceae) and recognition of P. davisii for two phrase names in south-west Western Australia. Swainsona, 33, 103-109.
    2019 Hammer, T. A., Zhong, X., Colas des Francs-Small, C., Nevill, P. G., Small, I. D., & Thiele, K. R. (2019). Resolving intergeneric relationships in the aervoid clade and the backbone of Ptilotus (Amaranthaceae): evidence from whole plastid genomes and morphology. Taxon, 68(2), 297-314.
    DOI Scopus8 WoS6
    2019 Mucina, L., & Hammer, T. A. (2019). Limonium dagmarae (Plumbaginaceae), a new species from namaqualand coast, South Africa. Phytotaxa, 403(2), 71-85.
    DOI Scopus1 WoS1
    2019 Hammer, T. A., Davis, R. W., & Thiele, K. R. (2019). Of a different feather: Two new species of featherheads from the Ptilotus macrocephalus (Amaranthaceae) complex. Australian Systematic Botany, 32(1), 61-70.
    DOI Scopus1 WoS1
    2018 Hammer, T. A., Davis, R. W., & Thiele, K. R. (2018). The showy and the shy: Reinstatement of two species from Ptilotus gaudichaudii (Amaranthaceae). Australian Systematic Botany, 31(1), 1-7.
    DOI Scopus5 WoS3
    2018 Hammer, T. (2018). The Ptilotus murrayi species group: synonymisation of P. petiolatus under P. murrayi and description of the new Western Australian species P. unguiculatus (Amaranthaceae). Swainsona, 31(2017/2018), 93-100.
    2018 Hammer, T. A., Macintyre, P. D., Nge, F. J., Davis, R. W., Mucina, L., & Thiele, K. R. (2018). The noble and the exalted: A multidisciplinary approach to resolving a taxonomic controversy within Ptilotus (Amaranthaceae). Australian Systematic Botany, 31(3), 262-280.
    DOI Scopus7 WoS5
    2018 Davis, R. W., & Hammer, T. A. (2018). Ptilotus yapukaratja (Amaranthaceae), a new species from the Gascoyne bioregion of Western Australia. Nuytsia, 29, 157-160.
    Scopus1
    2018 Hammer, T. A., & Davis, R. W. (2018). Ptilotus actinocladus (Amaranthaceae), a new and rare species from the Gascoyne bioregion, Western Australia. Nuytsia, 29, 145-150.
    Scopus2
    2017 Hammer, T. A., Davis, R. W., & Thiele, K. R. (2017). Wadithamnus, a new monotypic genus in amaranthaceae. Phytotaxa, 295(2), 173-184.
    DOI Scopus2 WoS2
    2017 Davis, R. W., & Hammer, T. A. (2017). Ptilotus benlii (Amaranthaceae), a new species from Western Australia. Nuytsia, 28, 299-302.
    Scopus1
    2017 Hammer, T. A., & Davis, R. W. (2017). Synonymisation of three Western Australian taxa within ptilotus (Amaranthaceae). Nuytsia, 28, 133-134.
    Scopus2
    2016 Davis, R. W., Hammer, T. A., & Thiele, K. R. (2016). A new and rare species of Nymphoides (Menyanthaceae) from the north west of Western Australia. Nuytsia, 27, 245-252.
    Scopus1
    2015 Hammer, T., Davis, R., & Thiele, K. (2015). A molecular framework phylogeny for Ptilotus (Amaranthaceae):Evidence for the rapid diversification of an arid Australian genus. Taxon, 64(2), 272-285.
    DOI Scopus20 WoS18
    2014 Davis, R. W., Hammer, T. A., & Thiele, K. R. (2014). Two new and rare species of Ptilotus (Amaranthaceae) from the Eneabba sandplains, Western Australia. Nuytsia, 24(1), 123-130.
    Scopus2

  • Internet Publications
    Year Citation
    2020 Davis, R., & Hammer, T. (2020). Online key to the species of Swainsona (Fabaceae) of Western Australia. KeyBase.
    2020 Hammer, T., & Davis, R. (2020). Online key to the species of Gomphrena (Amaranthaceae) of Western Australia. KeyBase.
    2017 Hammer, T., Davis, R., & Thiele, K. (2017). Online key to the species of Ptilotus (Amaranthaceae) of Western Australia. KeyBase.
    2017 Hammer, T., Davis, R., & Thiele, K. (2017). Online key to the species of Ptilotus (Amaranthaceae). KeyBase.

2020: Postdoctoral Fellowship – Australian Biological Resource Study, National Taxonomy Research Grant Program ($A330,000 over 3 years)

2015: PhD Scholarship – Forrest Research Foundation, University of Western Australia (~$A45,000/annum for 4 years)

2021: Practical Demonstrator, Plant Identification II (University of Adelaide)

2018: Practical Demonstrator, Plant Diversity and Evolution (University of Western Australia)

2018: Tutor, Conservation Biology (University of Western Australia)

2016: Practical Demonstrator, Plant Diversity and Evolution (University of Western Australia)

2016: Practical Demonstrator, Frontiers in Biology (University of Western Australia)

2015: Practical Demonstrator, Plant Diversity and Evolution (University of Western Australia)

2013: Teaching Assistant, Human Biology (Old Dominion University)

2012: Teaching Assistant, Environmental Science (Old Dominion University)

 

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