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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 extensa

Acacia extensa Lindl., 1839

Acacia calamistrata Jacq.
Acacia graminea Lehm. ex Meisn.
Acacia pentaedra Regel
Racosperma extensum (Lindl.) Pedley

Native distribution areas:
Acacia extensa

Continental: Australasia
Regional: Australia
Western Australia

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

Lindley, J. 1839-1840. Appendix to the first twenty-three volumes of Edwards's botanical register consisting of a complete alphabetical and systematical index of names, synomymes and matter, adjusted to the present state of systematical botany, together with a sketch of the vegetation of the Swan River colony. iv + lviii + lxiv p., 9 pl. London: James Ridgway. BHL Reference page. : xv.


Govaerts, R. et al. 2020. Acacia extensa in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2020 Aug 02. Reference page.
International Plant Names Index. 2019. Acacia extensa. Published online. Accessed: Aug 02 2019. 2019. Acacia extensa. Missouri Botanical Garden. Published online. Accessed: 02 Aug 2019.
Hassler, M. Aug. Acacia extensa. 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 online. Accessed: Aug 02 {{{3}}}. Reference page.
USDA, ARS, Germplasm Resources Information Network. Acacia extensa in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10.

Vernacular names
English: Wiry Wattle

Acacia extensa, commonly known as wiry wattle, is an erect shrub that is native to the South West corner of Western Australia. This particular species is resistant to dieback.[3]


The wiry wattle is a perennial evergreen shrub that grows to a height of 2 metres (7 ft) tall,[4] although it can grow taller under cultivation. This occasionally weeping bush produces angled glabrous branchlets that are green with yellowish ribs.[5] The foliage are light green filiform pyllodites that are scattered along the branchlets that they resemble, they are typically 6 centimetres (2.4 in) to 24 centimetres (9 in) in length and 0.75 millimetres (0.03 in) to 2 millimetres (0.08 in) in width. A. extensa typically flowers in spring (between August and October) and produces yellow ball shaped blossoms that are generally less than 1 centimetre (0.39 in) in diameter off short stem stalks called racemes.[6]

The species was first formally described by the botanist John Lindley in 1839 as part of the work A Sketch of the Vegetation of the Swan River Colony. Synonyms include Acacia graminea as described by Johann Georg Christian Lehmann, Acacia pentaedra by Eduard August von Regel, Acacia calamistrata by Nikolaus Joseph von Jacquin and Racosperma extensum by Leslie Pedley.[2]

The type specimen was collected in the Swan River Colony by James Drummond.[5]

A. extensa is found in the South West corner of Western Australia. The species is found as far east as Albany and as far north as Leeman. This species prefers sandy or sandy lateritic soils generally in damp areas such as along water courses or near lakes and swamps.[6]
See also

List of Acacia species

"Western Australian Natives Resistant to Phytophthora cinnamomi". 2006. Retrieved 1 October 2007.
"Acacia extensa Lindl". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 21 August 2018.
"ILDIS Legumeweb - Acacia extensa" (PDF). 2005. Archived (PDF) from the original on 29 August 2007. Retrieved 1 October 2007.
"Australian National Botanic Garden - Acacia extensa". 2007. Archived from the original on 3 September 2007. Retrieved 1 October 2007.
"World Wide Wattle - Acacia extensa". 2005. Archived from the original on 16 September 2007. Retrieved 1 October 2007.
"Acacia extensa". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.

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