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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 microcalyx

Acacia microcalyx Maslin, 1974

Racosperma microcalyx (Maslin) Pedley (2003)

Native distribution areas:
Acacia microcalyx

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., 1974, Nuytsia, Bulletin of the Western Australian Herbarium 1(4): 323.


Govaerts, R. et al. 2020. Acacia microcalyx in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2020 Aug 08. Reference page.
International Plant Names Index. 2019. Acacia microcalyx. Published online. Accessed: Aug 08 2019. 2019. Acacia microcalyx. Missouri Botanical Garden. Published online. Accessed: 08 Aug 2019.
Hassler, M. 2020. Acacia microcalyx. 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. 2020. Species 2000 & ITIS Catalogue of Life. Published online. Accessed: 2020 Aug 08. Reference page.
Acacia microcalyx – Taxon details on World Wide Wattle.

Acacia microcarpa, commonly known as manna wattle, is a shrub belonging to the genus Acacia and the subgenus Phyllodineae endemic to south eastern Australia.


The glabrous shrub typically grows to a height of 2.5 metres (8 ft) and has angled branchlets with insignificant stipules.[1] The grey coloured bark on the trunk and main branches is finely fissured.[2] The evergreen phyllodes usually have an oblanceolate to oblong-oblanceolate or elliptic-oblanceolate shape and are straight to slightly incurved. The smooth phyllodes are 2 to 6 cm (0.79 to 2.36 in) in length and have a width of 4 to 10 mm (0.16 to 0.39 in).[1] The shrub blooms between August and November.[2] The simple inflorescences are composed of spherical flower-heads made up of 14 to 22 bright to mid-golden coloured flowers. The linear green or brown seed pods that form after flowering are slightly to prominently curved with a length of around 8 cm (3.1 in) and a width of 2 to 5 mm (0.079 to 0.197 in). The pods contain dark broen seeds that are 3 to 4 mm (0.12 to 0.16 in) in length.[1]

The species was first formally described by the botanist Ferdinand von Mueller in 1858 as part of the work Fragmenta Phytographiae Australiae. It was reclassified as Racosperma microcarpum in 2003 by Leslie Pedley then transferred back to genus Acacia in 2006.[3] The specific epithet refers to the small seeds of the plant.[2]

The bulk of the population of the shrub is found throughout south eastern Australia from the Eyre Peninsula near Widunna in the west through to Mallee Cliffs National Park in New South Wales to the north east and Gunbower in Victoria in the south east where it grows in a variety of soil types and vegetation communities.[1] It is often found in sandy to loamy soils in mallee country.[2]
See also

List of Acacia species


"Acacia microcarpa". World Wide Wattle. Western Australian Herbarium. Retrieved 29 June 2019.
"Acacia microcarpa F.Muell". PlantNet. Royal Botanic Gardens, Sydney. Retrieved 29 June 2019.
"Acacia microcarpa F.Muell". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 28 June 2019.

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