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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 oswaldii

Acacia oswaldii F.Muell., 1863

Acacia amaliae Domin
Acacia amaliae var. orthophylla Domin
Acacia oswaldii var. abbreviata Benth.
Acacia sessiliceps F.Muell.
Racosperma oswaldii (F.Muell.) Pedley

Native distribution areas:
Acacia oswaldii

Continental: Australasia
Regional: Australia
New South Wales, Northern Territory, Queensland, South Australia, Victoria, Western Australia

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

Mueller, F.J.H. v., 1863. The Plants Indigenous to the Colony of Victoria 4:5.


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

Vernacular names
English: Curly Yarran, Middia, Miljee, Nelia, Umbrella Bush, Umbrella Wattle, Whyacka

Acacia oswaldii, commonly known as boree,[2] umbrella wattle, umbrella bush, whyacka, middia, miljee, nella and curly yarran,[3] is a shrub or tree of the genus Acacia and the subgenus Plurinerves.


The shrub or tree typically grows to a height of 1 to 6 metres (3 to 20 ft)[4] and can be found to 8 m (26 ft). It has terete and glabrous branchlets with many red, resinous micro-hairs. Phyllodes are spreading to erect with leaves that are linear, narrowly elliptic or narrowly oblong-elliptic shape that is straight to recurved, terete to flat, 2.5 to 10.5 centimetres (1 to 4 in) in length and 3 to 15 millimetres (0.12 to 0.59 in) wide.[3] Leaves are hairy when young, becoming hairless, edges smooth, with a straight often sharp point.[5]

It blooms from October to December and produces yellow flowers.[4] The simple inflorescences forms singly or in pairs in the axil of the phyllodes supported on hairy peduncles that are 0 to 1 millimetre (0.00 to 0.04 in) long. The flowers are heads globose holding 5 to 16-flowers that are 5 to 8 mm (0.2 to 0.3 in) in diameter. Seed pods form later that are curved or coiled and mostly flat except where raised over seeds. The leathery to woody pods are 4 to 25 cm (1.6 to 9.8 in) long and 5 to 12 mm (0.2 to 0.5 in) wide.[6] Seeds can be collected from March to May and sown from November to February and will germinated in 3 to 10 weeks. A. oswaldii can also be grown from cuttings.[7]

It is native to an area in the central and southern regions of South Australia and the Northern Territory, south west Queensland, western New South Wales,[6] northern Victoria[2] and the Pilbara and Goldfields-Esperance regions of Western Australia.[4]

The distribution is wide but scattered throughout arid, semi-arid and subtropical areas in all states on the mainland, occurring mainly in calcareous sands or loamy soils.[3]

The species was initially described by the botanist Ferdinand von Mueller in 1863 in the journal Fragmenta Phytographiae Australiae.[2] Several synonyms are known including Racosperma oswaldii,[6] Acacia sessiliceps, Acacia amaliae var. amaliae, Acacia osswaldi, Acacia amaliae, Acacia oswaldi var. abbreviata and Acacia amaliae var. orthophylla.[2]

The name honours Ferdinand Oswald, who was involved with the collection of the type specimen.[6] The type specimen was collected by von Mueller in 1851 near Blanchetown on the Murray River.[3]
See also

List of Acacia species


"Acacia oswaldii F.Muell. | Plants of the World Online | Kew Science". Plants of the World Online. Retrieved 2020-01-26.
"Acacia oswaldii F.Muell. Boree". The Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 18 July 2016.
"Acacia oswaldii". Worldwidewattle. CSIRO. Retrieved 18 July 2016.
"Acacia oswaldii". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
"Acacia oswaldii factsheet". Retrieved 18 July 2016.
"Acacia oswaldii F.Muell". PlantNET. Royal Botanic Gardens, Sydney. Retrieved 12 December 2016.
"Acacia oswaldii Umbrella Wattle". Tree Project Inc. Retrieved 18 July 2016.

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