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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 oldfieldii

Acacia oldfieldii F.Muell.

Fragm. (Mueller) 4(24): 7. 1863 [Sep 1863]
Acacia oldfieldii is a shrub belonging to the genus Acacia and the subgenus Juliflorae that is endemic to western Australia.


The bushy shrub typically grows to a height of 1.2 to 5 metres (4 to 16 ft).[1] It has glabrous branchlets and has citron golden-sericeous new growth. Like most species of Acacia it has phyllodes rather than true leaves. The patent to reflexed evergreen phyllodes have a linear-elliptic to linear-oblanceolate shape and can be straight to shallowly incurved. The thinly coriaceous and glabrous phyllodes have a length of 7 to 16.5 cm (2.8 to 6.5 in) and a width of 3 to 5 mm (0.12 to 0.20 in) and have yellow coloured margins and a straight to recurved tip along with many closely parallel non-prominent nerves.[2] It flowers from June to September producing[1] simple inflorescences that are found in pairs in the axils with 30 to 45 mm (1.2 to 1.8 in) long cylindrical flower-spikes with a diameter of 4 to 5 mm (0.16 to 0.20 in) loosely packed with bright golden coloured flowers. Following flowering thinly crustaceous and glabrous seed pods form that have a linear shape and are raised over and constricted between each of the seeds. The pods grow to as long as 10 cm (3.9 in) and have a width of 2 to 4 mm (0.079 to 0.157 in) with longitudinally arranged seeds inside. The glossy black seeds have an elliptic shape with a length of 3.5 to 4 mm (0.14 to 0.16 in) and a sub-conical terminal aril.[2]

The type specimen was collected by Augustus Frederick Oldfield from along the Murchison River[2] and was later formally described by the botanist Ferdinand von Mueller in 1863 as part of the work Fragmenta Phytographiae Australiae. It was reclassified as Racosperma oldfieldii in 2003 by Leslie Pedley then transferred back to genus Acacia in 2006.[3] The specific epithet honours the collector of the type specimen.

It is native to Mid West region of Western Australia from around Northampton in the north down to around Geraldton in the south. The plant is often situated on rises and rocky plains and will grow in sandy and clay soils and on sandstone.[1] It is commonly situated in coastal areas from around Eradu in the south east up to Kalbarri National Park in the north in soils over gravel or sandstone, ironstone and limestone as a part of sandplain shrubland communities often along with Calothamnus and Melaleuca species.[2]
See also

List of Acacia species


"Acacia oldfieldii". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
"Acacia oldfieldii". World Wide Wattle. Western Australian Herbarium. Retrieved 1 December 2019.
"Acacia oldfieldii F.Muell". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 1 December 2019.

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