Acacia paradoxa

The large shrub or tree up to {{convert|2|to|4|m|ft|0}} tall and has a similar width, it has ribbed branchlets that are often arched downward. It is dense with foliage; the leaves are actually enlarged petioles known as phyllodes. They are crinkly and the new ones are covered in hairs. The erect phyllodes are asymettric and have a lanceolate shape and are around {{convert|30|mm|in|2}} in length and {{convert|7|mm|in|3|abbr=on}} wide. The bush is also full of long spines. It usually flowers between August and November producing an axillary flower-spike with small, bright yellow spherical flower heads and the fruits are brown pods {{convert|4|to|7|cm|in|1}} long. The hard black seeds within have an oblong shape and are about {{convert|6|mm|in|3|abbr=on}} in length and half as wide.

The spiny stipules that grow at the base of the phyllodes deter livestock from feeding on or too close to the plant.

The species was first formally described by the botanist Augustin Pyramus de Candolle in 1813 as part of the work Catalogus Plantarum Horti Botanici Monspeliensis.{{cite web|url=https://bie.ala.org.au/species/http://id.biodiversity.org.au/node/apni/2920772#names|title=Acacia paradoxa DC. Kangaroo Acacia|accessdate=3 October 2018|work=Atals of Living Australia|publisher=Global Biodiversity Information Facility|archive-date=26 November 2018|archive-url=https://web.archive.org/web/20181126180852/https://bie.ala.org.au/species/http://id.biodiversity.org.au/node/apni/2920772#names|url-status=dead}}

The species name is from the Greek words para which means near and doxa meaning glory. This probably refers the unattractive and thorny shrub being quite showy when it is in bloom.

Many synonyms are known for the plant including; Acacia ornithophora, Acacia undulata, Mimosa paradoxa, Racosperma paradoxum, Acacia armata and Acacia hybrida.

Kangaroo thorn is widely spread across Australia, regenerating from seed after disturbances, such as bush fire. Small birds, including wrens, use this plant as shelter and dwelling, while it is relied upon as a food source for moths, butterflies and other insects, birds also feed on its seeds.

It is endemic to south eastern parts of South Australia, much of Victoria, eastern New South Wales and south eastern parts of Queensland. It has become naturalised in parts of Western Australia and Tasmania.{{cite web|url=http://saseedbank.com.au/species_information.php?rid=196|title=Acacia paradoxa (Leguminosae) Kangaroo Thorn|work=Seeds of South Australia|accessdate=3 October 2018|publisher=Government of South Australia}}

The plant has also been introduced to other continents. In the United States, kangaroo thorn is a well-known noxious weed in California.{{cite web|title=Acacia paradoxa|url=http://plants.usda.gov/java/profile?symbol=ACPA8|work=Plants Profile|publisher=United States Department of Agriculture|accessdate=2 April 2012}}

The plant is used as an ornamental or as a dense screening plant. It make an excellent habitat and food source for birds. It grows well in full sun or in a partly shaded position. It can be planted in dry to moist well-drained areas. Seeds require pre-treatment such as scarification prior to planting.

{{Reflist}}

• {{cite journal|last1=Zenni|first1=R. D.|last2=Wilson|first2=J. R. U.|last3=Le Roux|first3=J. J.|last4=Richardson|first4=D. M.|title=Evaluating the invasiveness of Acacia paradoxa in South Africa|journal=South African Journal of Botany|date=August 2009|volume=75|issue=3|pages=485–496|doi=10.1016/j.sajb.2009.04.001|doi-access=free}}
• {{cite journal|last1=Correia|first1=Marta|last2=Castro|first2=Silvia|last3=Ferrero|first3=Victoria|title=Reproductive biology and success of invasive Australian acacias in Portugal|journal=Botanical Journal of the Linnean Society|date=April 2014|volume=174|issue=4|pages=574–588|doi=10.1111/boj.12155|doi-access=free}}
• {{cite journal|last1=Castro-Diez|first1=P.|last2=Langendoen|first2=T.|last3=Poorter|first3=L.|title=Predicting Acacia invasive success in South Africa on the basis of functional traits, native climatic niche and human use|journal=Biodiversity and Conservation|date=1 November 2011|volume=20|issue=12|pages=2729–2743|doi=10.1007/s10531-011-0101-5|bibcode=2011BiCon..20.2729C |s2cid=41606801}}

• [http://plants.usda.gov/java/profile?symbol=ACPA8 USDA Plants Profile]
• [http://www.cdfa.ca.gov/phpps/ipc/weedinfo/acacia.htm EncycloWeedia Profile]
• [http://calphotos.berkeley.edu/cgi/img_query?query_src=photos_index&where-taxon=Acacia+paradoxa Photo gallery]

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paradoxa

Category:Fabales of Australia

Category:Flora of Victoria (state)

Category:Flora of South Australia

Category:Flora of New South Wales

Category:Flora of Queensland

Category:Taxa named by Augustin Pyramus de Candolle

Category:Plants described in 1813

Category:Flora of Western Australia

Category:Flora of Tasmania