Timothy Hammer
School of Biological Sciences
Faculty of Sciences, Engineering and Technology
Eligible to supervise Masters and PhD (as Co-Supervisor) - email supervisor to discuss availability.
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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.
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Awards and Achievements
Date Type Title Institution Name Country Amount 2020 Fellowship Australian Biological Resource Study Postdoctoral Fellowship University of Adelaide Australia 330,000 -
Education
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 -
Research Interests
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Journals
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.
Scopus12025 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.
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. (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. 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.
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.
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.
Scopus12023 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.
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.
2023 Salles, S., Espeland, T., Molares, A., Aase, S. A., Hammer, T. A., Stoylen, A., . . . Torp, H. (2023). 3D Myocardial Mechanical Wave Measurements: Toward In Vivo 3D Myocardial Elasticity Mapping (vol 14, pg 1495, 2021). JACC-CARDIOVASCULAR IMAGING, 16(2), 268.
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.
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), 3 pages.
Scopus11 WoS52022 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.
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), 4 pages.
Scopus13 WoS22022 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.
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 Hammer, T., & Davis, R. (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.
Scopus4 WoS1 Europe PMC22021 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.
Scopus32 WoS142021 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.
Scopus12 WoS8 Europe PMC32020 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.
Scopus22020 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.
Scopus5 WoS42020 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.
Scopus14 WoS82019 Mucina, L., & Hammer, T. A. (2019). Limonium dagmarae (Plumbaginaceae), a new species from namaqualand coast, South Africa. Phytotaxa, 403(2), 71-85.
Scopus4 WoS22019 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.
Scopus2 WoS12018 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.
Scopus5 WoS42018 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.
Scopus10 WoS52018 Davis, R. W., & Hammer, T. A. (2018). Ptilotus yapukaratja (Amaranthaceae), a new species from the Gascoyne bioregion of Western Australia. Nuytsia, 29, 157-160.
Scopus12018 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.
Scopus22018 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.
2017 Hammer, T. A., Davis, R. W., & Thiele, K. R. (2017). Wadithamnus, a new monotypic genus in amaranthaceae. Phytotaxa, 295(2), 173-184.
Scopus4 WoS22017 Davis, R. W., & Hammer, T. A. (2017). Ptilotus benlii (Amaranthaceae), a new species from Western Australia. Nuytsia, 28, 299-302.
Scopus12017 Hammer, T. A., & Davis, R. W. (2017). Synonymisation of three Western Australian taxa within ptilotus (Amaranthaceae). Nuytsia, 28, 133-134.
Scopus22016 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.
Scopus12015 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.
Scopus23 WoS182014 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- Thiele, K., Schahinger, R., & Hammer, T. A. (n.d.). Hibbertia doleritica (Dilleniaceae), a new Tasmanian species related to H. basaltica. Australian Journal of Taxonomy, 1-12.
- Thiele, K. R., & Hammer, T. A. (n.d.). Two new species and a new combination in the Western Australian Hibbertia glomerosa (Dilleniaceae) species group. Australian Journal of Taxonomy, 1-5.
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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.
2021: Postdoctoral Fellowship – Australasian Systematic Botany Society, Inc. Marlies Eichler Fellowship
2020: Postdoctoral Fellowship – Australian Biological Resource Study, National Taxonomy Research Grant Program
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)
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Current Higher Degree by Research Supervision (University of Adelaide)
Date Role Research Topic Program Degree Type Student Load Student Name 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
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Editorial Boards
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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