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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 tenuissima
Name

Acacia tenuissima F.Muell., 1859
Synonyms

Acacia xylocarpa var. tenuissima (F.Muell.) Benth. (1864) [Homotypic]
Racosperma tenuissimum (F.Muell.) Pedley (1987) [Homotypic]
Acacia luerssenii Domin (1926) [Heterotypic synonym]
Acacia pityoides F.Muell. (1859) [pro parte]

Distribution
Native distribution areas:
Acacia tenuissima

Continental: Australasia
Regional: Australia
Northern Territory, Queensland, South Australia, Western Australia

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

Mueller, F.J.H. v., 1859. Journal of the Proceedings of the Linnean Society. Botany. London 3:135.

Links

Govaerts, R. et al. 2020. Acacia tenuissima in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published online. Accessed: 2020 Aug 16. Reference page.
International Plant Names Index. 2019. Acacia tenuissima. Published online. Accessed: Aug 16 2019.
Tropicos.org 2019. Acacia tenuissima. Missouri Botanical Garden. Published online. Accessed: 16 Aug 2019.
Catalogue of Life: 2021 Annual Checklist
Acacia tenuissima – Taxon details on World Wide Wattle.
USDA, ARS, Germplasm Resources Information Network. Acacia tenuissima in the Germplasm Resources Information Network (GRIN), U.S. Department of Agriculture Agricultural Research Service. Accessed: 09-Oct-10.

Vernacular names
English: Narrow-leaved Wattle

Acacia tenuissima, commonly known as narrow-leaved wattle,[1] broom wattle,[1] minyana,[2] slender mulga[3] or slender wattle,[4] is a shrub belonging to the genus Acacia and the subgenus Juliflorae endemic to temperate and tropical areas[2] of Australia. Indigenous Australians the Kurrama peoples know the plant as Janangungu and the Banyjima know it as Murruthurru.[1]

Description

The slender and erect shrub typically grows to a height of 1 to 3 metres (3 to 10 ft)[5] although it can reach up to 4 m (13 ft) and can possess multiple stems. It has few to many slender and spreading to erect stems growing from ground level producing an open or dense crown. Smooth grey bark at the base with pale brown to dull reddish on the upper branches. The dull grey-green terete phyllodes are quite slender with a length of 6 to 17 centimetres (2 to 7 in) and a width of 0.7 to 1.3 millimetres (0.03 to 0.05 in) and have numerous fine parallel longitudinal nerves.[1] It blooms from April to August producing yellow flowers.[5] The simple racemose inflorescences are not prolific. They appear singly within the axils of the phyllodes. The flower-spikes are 5 to 15 mm (0.20 to 0.59 in) in length and are densely flowered with pale yellow to light golden coloured flowers. Following flowering greyish-brown straight to moderately curved seed pods form that can become irregularly twisted or coiled[1] and scaly with age.[6] The pods are up to about 9 cm (4 in) in length and contain shiny dark brown[1] to black[6] seeds that are 2.5 to 4 mm (0.10 to 0.16 in) in length with a width of around 2 mm (0.08 in). The seeds are relatively large and have an orange-to-yellow aril that are found to attract birds. Mature seeds are formed between September and November.[1]

The shrub resembles Acacia orthocarpa and is also similar to Acacia exilis and Acacia macdonnelliensis subsp. teretifolia.[6]
Taxonomy

The species was first formally described by the botanist Ferdinand von Mueller in 1859 as part of the work Contributiones ad Acaciarum Australiae Cognitionem as published in the Journal of the Proceedings of the Linnean Society, Botany. It was reclassified in 1987 by Leslie Pedley as Racosperma tenuissimum then transferred back to the genus Acacia in 2006. Other synonyms include; Acacia luerssenii, Acacia pityoides, Acacia xylocarpa var. tenuissima and Acacia xylocarpa var. xylocarpa.[7]

The species name is taken from Latin words tenuis meaning thin and -issimus meaning very, which refers to the slender, terete foliage that is characteristic of the plant.[1]

A. tenuissima is sometimes found with and is closely related to Acacia adsurgens, and is also related to Acacia exilis.[1]
Distribution

It is native to arid areas of inland Australia. In South Australia it is found in northern western parts with a small population also centred around Lake Eyre in the east.[4] It is found through much of the central and southern parts of the Northern Territory and in central Queensland. It also has a scattered distribution through the Kimberley and Pilbara regions of Western Australia.[5] It is often found along ephemeral watercourses, on low undulating country, along rocky slopes and on stabilized inland dunes and spinifex plains. It can grow in sandy, loamy, clay and rocky soils.[1] It is usually part of Eucalyptus woodland communities and is often with spinifex.[2]
Cultivation and uses

Seeds for the plant are commercially available[8][9] and can be used in gardens as an attractive slender shrub for arid areas that are good bird attractors.[1] To grow well, a sunny position in well-drained soil is required.[10] Seeds need scarification[2] or hot water treatment prior to planting.[3] The seeds were collected by Indigenous Australians from the Pilbara region to be eaten and used in the making of damper.[1]
See also

List of Acacia species

References

"Factsheet Acacia tenuissima". Wattles of the Pilbara. Department of Environment and Conservation. 2010. Retrieved 7 October 2018.
"Acacia tenuissima F.Muell". Wattle – Acacias of Australia. Department of the Environment and Energy. Retrieved 7 October 2018.
"Acacia tenuissima Slender Mulga". Nindethana Australian Seeds. Retrieved 7 October 2018.
"Acacia tenuissima (Leguminosae) Slender Wattle". Seeds of South Australia. South Australian Seed Conservation Centre. 2018. Retrieved 7 October 2018.
"Acacia tenuissima". FloraBase. Western Australian Government Department of Biodiversity, Conservation and Attractions.
"Acacia tenuissima". World Wide Wattle. Western Australian Herbarium. Retrieved 7 October 2018.
"Acacia tenuissima F.Muell". Atlas of Living Australia. Global Biodiversity Information Facility. Retrieved 7 October 2018.
"Seeds of Native Plants of the Monsoon Tropics of Northen (sic) Australia". Top End Seeds. Retrieved 7 October 2018.
"Pilbara species list" (PDF). Kimseed. Retrieved 7 October 2018.
Ken Fern (2014). "Acacia tenuissima F.Muell. Fabaceae". Useful Tropical Plants. Retrieved 7 October 2018.

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