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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 undoolyana

Acacia undoolyana G.J.Leach, 1988

Racosperma undoolyanum (G.J.Leach) Pedley

Native distribution areas:
Acacia undoolyana

Continental: Australasia
Regional: Australia
Northern Territory

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

Leach, G.J., 1988. Journal of the Adelaide Botanic Gardens 11(1): 55. 1988


Govaerts, R. et al. 2020. Acacia undoolyana in Kew Science Plants of the World online. The Board of Trustees of the Royal Botanic Gardens, Kew. Published on the internet. Accessed: 2020 Aug 17. Reference page.
International Plant Names Index. 2019. Acacia undoolyana. Published online. Accessed: Aug 17 2019. 2019. Acacia undoolyana. Missouri Botanical Garden. Published on the internet. Accessed: 2019 Aug 17.
Catalogue of Life: 2020 Annual Checklist
Acacia undoolyana – Taxon details on World Wide Wattle.

Vernacular names
English: Sickle-leaf wattle, Undoolya wattle

Acacia undoolyana ( common names Sickle-leaf wattle, Undoolya wattle)[1] is a species of wattle native to central Australia.[3]


Acacia undoolyana is a shrub or small tree growing up to 15 m high and has persistent fissured bark. Both stems and phyllodes have a covering of minute flattened hairs, when young. The phyllodes are flat, linear to narrowly elliptic, and silvery when young but later a grey-green. They are sickle-shaped, are 120–220 mm long by 5–15 mm wide, and have a marginal basal gland and a prominent apical gland. They have multiple parallel nerves of which up to three are more prominent. The inflorescence is a yellow cylindrical spike on a hairy peduncle 3–6 mm long. The pods are linear and 50–110 mm long by 2–3 mm wide, and the seeds have a white aril.[1]

It flowers from June to September and fruits from August to December.[1]

It is found in the MacDonnell Ranges Bioregion of Central Australia.[1] The main population is on Undoolya station.[5]

It is generally found on steep south facing slopes on skeletal soils.[1][5]
Conservation status

It is listed as "vulnerable" under both Commonwealth and Territory legislation.[1][2] The major threat to its survival is frequent bushfires.[4]

"Acacia undoolyana G.J.Leach". Flora NT. Retrieved 25 January 2020.
"Acacia undoolyana — Undoolya Wattle, Sickle-leaf Wattle". Department of the Environment. Commonwealth of Australia. Retrieved 25 January 2020.
"Acacia undoolyana G.J.Leach". WATTLE Acacias of Australia. Retrieved 24 January 2020.
Leach, G.J.; Latz, P.K.; Soos, A. (1988). "Acacia undoolyana: A new species from central Australia". Journal of the Adelaide Botanic Gardens. 11 (1): 55–58. JSTOR 23888259. pdf
Tindale, M.D.; Kodela, P.G. (2020). "Acacia undoolyana G.J.Leach". Flora of Australia. Canberra: Australian Biological Resources Study, Department of the Environment and Energy. Retrieved 25 January 2020.

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