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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 effusa

Acacia effusa Maslin, 1982

Racosperma effusum (Maslin) Pedley

Native distribution areas:
Acacia effusa

Continental: Australasia
Regional: Australia
Western Australia

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

Maslin, B.R., 1995. Nuytsia; Bulletin of the Western Australian Herbarium 4(1): 85 (1982).


Govaerts, R. et al. 2020. Acacia effusa in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2020 Aug 01. Reference page.
International Plant Names Index. 2019. Acacia effusa. Published online. Accessed: Aug 011 2019. 2019. Acacia effusa. Missouri Botanical Garden. Published on the internet. Accessed: 2019 Aug 01.
Hassler, M. Aug. Acacia effusa. 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. Aug. Species 2000 & ITIS Catalogue of Life. Published on the internet. Accessed: Aug 01 {{{3}}}. Reference page.

Vernacular names

Acacia effusa is a shrub belonging to the genus Acacia and the subgenus Juliflorae that is endemic to north western Australia.


The shrub is dense and spreading typically grows to a height of 0.3 to 1 metre (1 to 3 ft).[1] It has grey to grey-red coloured minni ritchi style bark that peels backward in small rolls. The terete branchlets are matted with dense wolly hairs but become more glabrous as they mature. Like most species of Acacia it has phyllodes rather than true leaves. The evergreen phyllodes are ascending and have an obliquely oblong-elliptic to narrowly elliptic shape with a length of 0.6 to 1.5 cm (0.24 to 0.59 in) and a width of 2 to 7 mm (0.079 to 0.276 in) with a mid-nerve that is quite prominent.[2] It blooms from May to August producing yellow flowers.[1]

The species was first formally described by the botanist Bruce Maslin in 1982 as part of the work Studies in the genus Acacia (Leguminosae: Mimosoideae). Acacia species of the Hamersley Range area, Western Australia as published in the journal Nuytsia. It was reclassified as Racosperma effusum by Leslie Pedley in 2003 then transferred back to genus Acacia in 2006.[3]

It is native to an area in the Pilbara region of Western Australia where it is often situated on scree slopes of low ranges growing in stony red loamy soils.[1] It has a limited range mostly within the Hamersley Range National Park where it is considered to be abundant on the lower slopes where the watercourses exit the range.[2]
See also

List of Acacia species


"Acacia effusa". FloraBase. Western Australian Government Department of Parks and Wildlife.
"Acacia effusa". WorldWideWattle. Western Australian Herbarium. Retrieved 16 April 2020.
"Acacia effusa Maslin". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 16 April 2020.

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