Dr Timothy Hammer

Grant-Funded Postdoctoral Research Fellow

School of Biological Sciences

College of Sciences

Eligible to supervise Masters and PhD (as Co-Supervisor) - email supervisor to discuss availability.


I am a Research Botanist with a joint-appointment at the School of Biological Sciences (University of Adelaide) and the Botanic Gardens and State Herbarium (DEW, SA Gov.). In my role, I conduct research on the evolution, systematics and taxonomy of native Australian plants and contribute to teaching Evolutionary Biology III (ENV BIOL 3590), Evolution of Australian Biota III (ENV BIOL 3560), and Plant Identification II (ENV BIOL 2510). At the State Herbarium, I also conduct plant identification services and help to maintain South Australia's Plant Census, among other duties.

I completed a postdoctoral fellowship in 2024 that was funded by the Australian Biological Resource Study's National Taxonomy Research Grant Program (DCCEEW, Australian Gov.). The project involved studying the systematics and resolving the taxonomy of the very diverse Australian genus Hibbertia (guinea flowers) and writing the Flora of Australia treatments for the Dilleniaceae (including Hibbertia, Dillenia and Tetracera). I earned my PhD from the University of Western Australia in 2019, completing my thesis on the systematics and taxonomy of the Australian plant genus Ptilotus (Amaranthaceae). I have published numerous studies on these two plant groups.

 

Date Type Title Institution Name Country Amount
2020 Fellowship Australian Biological Resource Study Postdoctoral Fellowship University of Adelaide Australia 330,000

Date Institution name Country Title
2019 University of Western Australia Australia PhD
2014 Old Dominion University United States MSc
2012 Old Dominion University United States BSc

Year Citation
2025 Nge, F. J., Hammer, T. A., Vasconcelos, T., Biffin, E., Kellermann, J., & Waycott, M. (2025). Polyploidy linked with species richness but not diversification rates or niche breadth in Australian Pomaderreae (Rhamnaceae). Annals of Botany, 135(3), 531-548.
DOI Scopus2 WoS2
2025 Thiele, K., Schahinger, R., & Hammer, T. (2025). Hibbertia doleritica (Dilleniaceae), a new Tasmanian species related to H. basaltica. Australian Journal of Taxonomy, 86, 1-12.
DOI
2025 Hammer, T. A., Biffin, E., van Dijk, K. -J., Thiele, K. R., & Waycott, M. (2025). A framework phylogeny of the diverse guinea-flowers (Hibbertia, Dilleniaceae) using high-throughput sequence data. Australian Systematic Botany, 38(2), SB24009-1-SB24009-20.
DOI Scopus3 WoS3
2025 Simpson, L., Cantrill, D. J., Byrne, M., Allnutt, T. R., King, G. J., Lum, M., . . . Crayn, D. M. (2025). The Genomics for Australian Plants (GAP) framework initiative – developing genomic resources for understanding the evolution and conservation of the Australian flora. Australian Systematic Botany, 38(3), 19 pages.
DOI Scopus6 WoS6
2025 Joyce, E. M., Schmidt-Lebuhn, A. N., Orel, H. K., Nge, F. J., Anderson, B. M., Hammer, T. A., & Mclay, T. G. B. (2025). Navigating phylogenetic conflict and evolutionary inference in plants with target-capture data. Australian Systematic Botany, 38(3), 27 pages.
DOI Scopus7 WoS7
2025 Williamson, L. T., Biffin, E., Hammer, T. A., van Dijk, K. -J., Conran, J. G., & Waycott, M. (2025). Phylogenomics of Australian sundews (Drosera: Droseraceae). Australian Systematic Botany, 38(4), SB24016-1-SB24016-20.
DOI Scopus2 WoS2
2024 McDougall, A., & Hammer, T. (2024). A reinstated synonymy and corrected type citation for Caladenia haemantha (Orchidaceae), with taxonomic notes on Caladenia formosa. Swainsona, 38, 171-179.
2024 Hammer, T., & Davis, R. (2024). Ptilotus ostentans (Amaranthaceae), a new species from Western Australia segregated from Ptilotus seminudus. Swainsona, 38, 73-77.
2024 Thiele, K., & Hammer, T. (2024). Four new small-flowered species of Western Australian Hibbertia (Dilleniaceae). Australian Journal of Taxonomy, 53, 1-12.
DOI
2024 Thiele, K. R., & Hammer, T. A. (2024). Four new Western Australian species related to Hibbertia axillibarba (Dilleniaceae). Australian Journal of Taxonomy, 58, 1-6.
DOI
2024 Hammer, T., & Thiele, K. (2024). New combinations of Hibbertia (Dilleniaceae) segregated from H. hibbertioides and H. glomerata. Nuytsia, 35(Volume 35, 22 Mar 2024), 31-45.
DOI Scopus2
2024 Thiele, K. R., & Hammer, T. A. (2024). Two new species and a new combination in the Western Australian Hibbertia glomerosa (Dilleniaceae) species group. Australian Journal of Taxonomy, 61, 1-5.
DOI
2024 Hammer, T. (2024). New combinations in the Hibbertia vestita (Dilleniaceae) species group from New South Wales. Swainsona, 38, 141-152.
2024 Hammer, T., & Thiele, K. (2024). Revision of the Western Australian Hibbertia cunninghamii species group (Dilleniaceae). Swainsona, 38, 131-140.
2023 Hammer, T. (2023). Description of Hibbertia hesperia (Dilleniaceae), a new species from the Kimberley region, and a new regional key to species. Swainsona, 37, 1-6.
2023 Hammer, T. (2023). Hibbertia radians (Dilleniaceae), a new combination from South Australia. Swainsona, 37(2), 63-70.
2023 Hammer, T., & Thiele, K. (2023). Two new Western Australian species related to Hibbertia
priceana (Dilleniaceae). Australian Journal of Taxonomy, 29, 1-8.

DOI
2023 Hammer, T. (2023). Hibbertia fulva (Dilleniaceae), a new species from the Northern Territory in
the H. banksii species group. Swainsona, 37(3), 71-74.
2023 Thiele, K. R., & Hammer, T. A. (2023). Hibbertia glaucophylla is the correct name for the Western Australian species currently known as H. rupicola (Dilleniaceae). Australian Journal of Taxonomy, 13, 1-5.
DOI
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: international journal of plant taxonomy, phylogeny and evolution, 71(4), 892-896.
DOI
2022 Hammer, T., & Thiele, K. (2022). Hibbertia archeri (Dilleniaceae), a new and rare species from Western Australia with transcontinental affinities. Swainsona, 36(2), 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, 71(5), 933-935.
DOI Scopus15 WoS15
2022 Thiele, K. R., & Hammer, T. A. (2022). Hibbertia subvillosa (Dilleniaceae), a new Western Australian species segregated from H. striata. Australian Journal of Taxonomy, 8, 1-5.
DOI
2022 Thiele, K. R., Smith, G. F., Figueiredo, E., & Hammer, T. A. (2022). Taxonomists have an opportunity to rid botanical nomenclature of inappropriate honorifics in a structured and defensible way. Taxon, 71(6), 1151-1154.
DOI Scopus16 WoS13
2022 Hammer, T. A., Toelken, H. R., & Thiele, K. (2022). Hibbertia advena (Dilleniaceae), a new and rare species from Queensland with transcontinental affinities. Australian Journal of Taxonomy, 9, 1-5.
DOI
2022 Hammer, T. (2022). Two new cremnophilous Hibbertia (Dilleniaceae) species from the Northern Territory. Swainsona, 36(4), 121-127.
2022 Hammer, T. (2022). Inadvertent lectotypifications of Australian Dillenia and Tetracera (Dilleniaceae). Swainsona, 36(4), 101-103.
2022 Hammer, T. (2022). Updated nomenclature and an identification key for Hibbertia subg. Pachynema (Dilleniaceae), and description of a new species from the Northern Territory. Swainsona, 36(6), 153-160.
2022 Davis, R., & Hammer, T. (2022). Swainsona picta (Fabaceae), a new species from the Yalgoo bioregion, Western Australia. Swainsona, 36, 71-73.
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 Scopus7 WoS9 Europe PMC2
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 Scopus38 WoS32
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 Scopus15 WoS13 Europe PMC7
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 Scopus2 WoS1
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 Scopus5 WoS4 Europe PMC1
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.
DOI
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 Scopus17 WoS14
2019 Mucina, L., & Hammer, T. A. (2019). Limonium dagmarae (Plumbaginaceae), a new species from namaqualand coast, South Africa. Phytotaxa, 403(2), 71-85.
DOI Scopus4 WoS4
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 Scopus2 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 WoS4
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 Scopus10 WoS6
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
2018 Hammer, T. A., Davis, R. W., & Thiele, K. R. (2018). A key to Ptilotus (Amaranthaceae) in Western Australia. Nuytsia : The journal of the Western Australian Herbarium, 29(Volume 29, 13 Dec 2018), 217-227.
DOI
2017 Hammer, T. A., Davis, R. W., & Thiele, K. R. (2017). Wadithamnus, a new monotypic genus in amaranthaceae. Phytotaxa, 295(2), 173-184.
DOI Scopus4 WoS4
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(Volume 27, 13 Dec 2016), 245-252.
DOI 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 Scopus24 WoS23
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.
DOI Scopus2

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.

Year Citation
2025 Biffin, E., Waycott, M., Hammer, T., & van Dijk, K. -J. (2025). A comparison of two universal angiosperm bait sets and the phylogenomics of Alismatales.
DOI

2021: Postdoctoral Fellowship – Australasian Systematic Botany Society, Inc. Marlies Eichler Fellowship

2020: Postdoctoral Fellowship – Australian Biological Resource Study, National Taxonomy Research Grant Program

 

2025: Plant Identification II (ENV BIOL 2510)

2024: Plant Identification II (ENV BIOL 2510), Evolutionary Biology III (ENV BIOL 3590) & Evolution of Australian Biota III (ENV BIOL 3560)

2023: Evolutionary Biology III (ENV BIOL 3590) & Evolution of Australian Biota III (ENV BIOL 3560)

2022: Evolution of Australian Biota III (ENV BIOL 3560) & Plant Identification II (ENV BIOL 2510)

2021: Plant Identification II (ENV BIOL 2510)

 

Date Role Research Topic Program Degree Type Student Load Student Name
2025 Co-Supervisor Investigating the taxonomy, systematics and phylogenetics of Australian Frankenia Doctor of Philosophy Doctorate Full Time Miss Emily Rose Hoskin
2025 Co-Supervisor Investigating the taxonomy, systematics and phylogenetics of Australian Frankenia Doctor of Philosophy Doctorate Full Time Miss Emily Rose Hoskin
2024 Co-Supervisor Systematics and biodiversity of Australian gall forming wasps within Chalcidoidea Doctor of Philosophy Doctorate Full Time Miss Tareva-Chine Corazon Atkin-Zaldivar
2024 Co-Supervisor Systematics and biodiversity of Australian gall forming wasps within Chalcidoidea Doctor of Philosophy Doctorate Full Time Miss Tareva-Chine Corazon Atkin-Zaldivar
2022 Co-Supervisor Orchid systematics and conservation Doctor of Philosophy Doctorate Full Time Mr Andrew Evan McDougall
2022 Co-Supervisor Orchid systematics and conservation Doctor of Philosophy Doctorate Full Time Mr Andrew Evan McDougall

Date Role Editorial Board Name Institution Country
2023 - ongoing Editor Australian Journal of Taxonomy Taxonomy Australia Australia
2021 - ongoing Associate Editor Swainsona State Herbarium of South Australia Australia

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