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Classification System: APG IV

Superregnum: Eukaryota
Regnum: Plantae
Cladus: Angiosperms
Cladus: Eudicots
Cladus: Core eudicots
Cladus: Rosids
Cladus: Eurosids I
Ordo: Fabales

Familia: Fabaceae
Subfamilia: Caesalpinioideae
Tribus: Acacieae
Genus: Acacia
Species: Acacia thomsonii

Acacia thomsonii Maslin & M.W.McDonald, 1996

Racosperma thomsonii (Maslin & M.W.McDonald) Pedley

Native distribution areas:
Acacia thomsonii

Continental: Australasia
Regional: Australia
Northern Territory, Queensland, Western Australia

References: Brummitt, R.K. 2001. TDWG – World Geographical Scheme for Recording Plant Distributions, 2nd Edition
Primary references

Maslin, B.R. & McDonald, M.W..1996. Nuytsia; Bulletin of the Western Australian Herbarium. South Perth, W.A. 10(3):444, t. 1, 2.


Govaerts, R. et al. 2020. Acacia thomsonii in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2020 Aug 16. Reference page.
International Plant Names Index. 2019. Acacia thomsonii. Published online. Accessed: Aug 16 2019. 2019. Acacia thomsonii. Missouri Botanical Garden. Published online. Accessed: 16 Aug 2019.
Catalogue of Life: 2021 Annual Checklist
Acacia thomsonii – Taxon details on World Wide Wattle.
USDA, ARS, Germplasm Resources Information Network. Acacia thomsonii in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10.

Vernacular names
English: Thomson's Wattle

Acacia thomsonii, commonly known as Thomson's wattle,[1] is a shrub or tree belonging to the genus Acacia and the subgenus Juliflorae that native to parts of northern Australia.


The often spindly shrub or tree typically grows to a height of 2 to 6 metres (7 to 20 ft).[2] The green to grey-green phyllodes are patent to ascending. The phyllodes are straight and usually slightly asymmetric with an oblanceolate to narrowly oblong-elliptic shape with a length of 7.5 to 17 cm (3.0 to 6.7 in) and a width of 1 to 2 cm (0.39 to 0.79 in). The phyllodes are multistriate and normally have three nerves that are more obvious than the rest.[1] It blooms from June to August producing yellow flowers.[2] The rudimentary inflorescences are held by two-headed racemes with axes of a length of around 0.5 mm (0.020 in). The flower spikes are 15 to 30 mm (0.59 to 1.18 in) in length. The seed pods that form after flowering are linear and straight to shallowly curved. The pods have a length of 4.5 to 8 cm (1.8 to 3.1 in) and a width of 3 to 4.5 mm (0.12 to 0.18 in). The glossy black to brown seeds within are longitudinal with an oblong shape and have a length of 3 to 5 mm (0.12 to 0.20 in) and have a bright yellow aril.[1]

The species was first formally described by the botanists Bruce Maslin and William McDonald in 1996 as part of the work Acacia thomsonii (Leguminosae: Mimosoideae: Acacia section Juliflorae) a new species from the tropical dry zone of Australia as published in the journal Nuytsia. It was reclassified as Racosperma thomsonii in 2003 by Leslie Pedley and transferred back to genus Acacia in 2006.[3]

In Western Australia it is found only in the Kimberley region.[2] It is also found through the top end of the Northern Territory and parts of Western Queensland.[3] The plants are often situated on dissected plateaux and rocky low hills, stony or sandy plains and along diffuse drainage lines mostly growing in skeletal and slightly acidic rocky sandy soils.[1]
See also

List of Acacia species


"Acacia thomsonii". World Wide Wattle. Western Australian Herbarium. Retrieved 20 February 2019.
"Acacia thomsonii". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
"Acacia thomsonii Maslin & M.W.McDonald". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 7 October 2018.

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