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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 difficilis

Acacia difficilis Maiden, 1917

Racosperma difficile (Maiden) Pedley, Austrobaileya, 2(4): 348 (1987)

Native distribution areas:
Primary references

Maiden, J.H. in Ewart & O. B. Davies, 1917. Fl. N. Territory 344. 1917

Additional references

Govaerts, R.H.A. 1995. World Checklist of Seed Plants 1(1, 2). 483, 529 pp. MIM, Deurne. ISBN 90-341-0852-X (issue 1) ISBN 90-341-0853-8 (issue 2). Reference page.


Govaerts, R. et al. 2021. Acacia difficilis in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2021 Jun 22. Reference page.
International Plant Names Index. 2021. Acacia difficilis. Published online. Accessed: Jun 22 2021. 2021. Acacia difficilis. Missouri Botanical Garden. Published online. Accessed: 22 Jun 2021.
Hassler, M. 2021. Acacia difficilis. World Plants: Synonymic Checklists of the Vascular Plants of the World In: Roskovh, Y., Abucay, L., Orrell, T., Nicolson, D., Bailly, N., Kirk, P., Bourgoin, T., DeWalt, R.E., Decock, W., De Wever, A., Nieukerken, E. van, Zarucchi, J. & Penev, L., eds. 2021. Species 2000 & ITIS Catalogue of Life. Published online. Accessed: 2021 Jun 22. Reference page.
Hassler, M. 2021. World Plants. Synonymic Checklist and Distribution of the World Flora. . Acacia difficilis. Accessed: 22 Jun 2021.
USDA, ARS, Germplasm Resources Information Network. Acacia difficilis in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10..

Vernacular names

Acacia difficilis is a tree belonging to the genus Acacia and the subgenus Juliflorae that is endemic to tropical parts of northern Australia.


The tree typically grows to a height of 3.5 to 13 metres (11 to 43 ft)[1] and has fibrous, grey to brown coloured bark on both the trunk and branches. It has grey to brown branchlets that are almost terete which can be densely pubescent or glabrous. Like most species of Acacia it has phyllodes rather than true leaves. The evergreen, narrowly elliptic phyllodes have a tapered base and are 5.5 to 14 cm (2.2 to 5.5 in) in length and 15 to 40 mm (0.59 to 1.57 in) wide. The thinly coriaceous phyllodes are silvery-white and covered in a dense mat of woolly hair when young and have five to nine prominent longitudinal nerves.[2] It blooms from May to September producing yellow flowers.[1]

It is native to an area in the Kimberley region of Western Australia,[1] to the top end of the Northern Territory, and north-west Queensland.[3] It is quite common in the northern parts of the Northern Territory and is also found on Thursday Island and Melville Island, it is much rarer in Western Australia where it is found around Kununurra and is also found near the Gulf of Carpentaria in Queensland. It is usually situated along creeks growing in sandy or gravelly soils as a part of open woodland communities where it is often associated with Eucalyptus tetrodonta.[2]
See also

List of Acacia species


"Acacia difficilis". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
"Acacia difficilis". WorldWideWattle. Western Australian Herbarium. Retrieved 8 April 2020.
M.D. Tindale, P.G. Kodela & B.R. Maslin (2020). "Acacia difficilis". Flora of Australia. Australian Biological Resources Study, Department of Agriculture, Water and the Environment, Canberra. Retrieved 2020-02-27.

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