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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 merrallii

Acacia merrallii F.Muell.

Proceedings of the Linnean Society of New South Wales 15:18. 1890
USDA, ARS, Germplasm Resources Information Network. Acacia merrallii in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10.

Acacia merrallii, commonly known as Merrall's wattle,[1] is a shrub belonging to the genus Acacia and the subgenus Phyllodineae that is endemic to south western and southern Australia.


The shrub typically grows to a height of 0.3 to 2.0 metres (1.0 to 6.6 ft)[2] with a width 2 to 3 m (6 ft 7 in to 9 ft 10 in)[3] and can have a dense, rounded or spreading habit. The branchlets are often covered in minutely fine, straight or barely curved hairs. Like most species of Acacia it has phyllodes rather than true leaves. The thick, smooth, grey-green phyllodes have an obliquely obovate to oblong-elliptic shape and is occasionally ovate. The phyllodes have a length of 8 to 25 mm (0.31 to 0.98 in) and a width of 5 to 17 mm (0.20 to 0.67 in) and are mostly slightly undulate with an obscure midrib and prominent margins.[1] It blooms from August to October and produces yellow flowers.[2] The rudimentary inflorescences are found on one to three headed racemes with a length of up to 1 mm (0.039 in). The spherical flower-heads have a diameter of 4 to 5 mm (0.16 to 0.20 in) and contain 22 to 35 golden coloured flowers. The bow shaped to irregularly coiled seed pods that form after flowering have a length of up to 2 cm (0.79 in) and a width of 2 to 3 mm (0.079 to 0.118 in). The dark brown to black coloured glabrous pods are thinly coriaceous-crustaceous. The seeds inside are arranged longitudinally and are up to 2.5 mm (0.098 in) in length with a conspicuous orange coloured aril.[1]

The species was first formally described by the botanist Ferdinand von Mueller in 1890 as part of the work Descriptions of hitherto unrecorded Australian plants, with additional phyto-geographic notes as published in the Proceedings of the Linnean Society of New South Wales. It was reclassified as Racosperma merrallii in 2003 by Leslie Pedley then transferred back to genus Acacia in 2006. The only other synonyms are Acacia merrallii var. merrallii and Acacia dubia.[4]

In Western Australia it is native to an area in the Goldfields-Esperance and Wheatbelt regions of Western Australia where it is commonly situated on plains, low-lying areas and around salt lakes where it grows in sandy clay, sandy, loamy, calcareous or lateritic soils.[2] In Western Australia the range of the shrub extends from around Wubin in the north west to around Pingrup in the south west extending out to around Madura in the east. It is also found in South Australia along coastal areas of the Nullarbor Plain to around Moonta in the north east and Maitland in the south east on the Yorke Peninsula.[1]

The shrub is available commercially where it can be planted as an ornamental plant suitable for low maintenance areas where it can be employed as an understorey shrub in mixed plantings and along roadside verges or on median strips as a wind-break, natural barrier or erosion control. It can be planted close to the coast line or in hills or on plains in full sun or part shade and can tolerate drought and moderate frosts. It is both bird and insect attracting.[3]
See also

List of Acacia species


"Acacia merrallii". WorldWideWattle. Western Australian Herbarium. Retrieved 23 April 2020.
"Acacia merrallii". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
"Acacia merrallii Merralls Wattle". Plant Selector. Botanic Gardens of South Australia. Retrieved 23 April 2020.
"Acacia merrallii F.Muell". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 23 April 2020.

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