{{Short description|Species of plant}} {{Speciesbox |name = Western myall |image = HAM Roe Plain 4 Madura pass Proposed NR IX-2010.JPG |image_alt = Western myall on the Roe Plains, near Madura, Western Australia |image_caption = Western myall on the Roe Plains, near Madura, Western Australia |genus = Acacia |species =papyrocarpa |authority =Benth. |range_map = Acacia papyrocarpaDistMap671.png |range_map_caption = Occurrence data from AVH }}
'''''Acacia papyrocarpa''''', commonly known as '''western myall''',<ref name=FloraBase/> is a tree in the family Fabaceae native to arid areas of central and western Australia.
==Description== Western myall typically grows as a shrub or an upright tree to a height of {{cvt|2|to|8|m}} but can grow as tall as {{cvt|10|m}}. It has fissured grey coloured bark<ref name=FloraBase>{{FloraBase|name=Acacia papyrocarpa|id=3481}}</ref> and a dense spreading to rounded crown.<ref name=FOA>{{Flora of Australia Online|name=Acacia papyrocarpa|id=41556}}</ref> It has pendulous and hairy branchlets. Like most ''Acacia'' species, it has phyllodes rather than true leaves. These are greyish-green in colour, straight and flat, between {{cvt|4|and|12|cm}} in length and {{cvt|1|to|2|mm}} wide. The hairy phyllodes are acuminate with a fine curved and innocuous point that is not rigid and have many closely parallel indistinct nerves.<ref name=FOA/> It blooms between August and November<ref name=FloraBase/> producing rudimentary inflorescences. The flowers are yellow, and held in spherical clusters that are about {{cvt|5|mm}} in diameter and contain 20 to 25 golden flowers. After flowering thin and flat seed pods form that have a length of about {{cvt|11|cm}} and a width of {{cvt|4|to|10|mm}} that are flat with a narrowly oblong shape. The subnitid dark brown seeds inside the pods have a broadly elliptic to ovate shape with a length of {{cvt|4.5|to|5|mm}}.<ref name=FOA/>
==Taxonomy== The species was first formally described by the botanist George Bentham in 1864 as part of the work ''Flora Australiensis''. It was reclassified as ''Racosperma papyrocarpum'' by Leslie Pedley in 2003 then transferred back to genus ''Acacia'' in 2006. The only other synonyms are ''Acacia sowdeni'' and ''Acacia sowdenii''.<ref>{{cite web|url=https://bie.ala.org.au/species/https://id.biodiversity.org.au/node/apni/2907471#names|title=''Acacia papyrocarpa'' Benth.|accessdate=19 April 2020|work=Atlas of Living Australia|publisher=Global Biodiversity Information Facility}}</ref>
==Distribution== It is endemic to arid parts of central Australia, it occurs on limestone plains in southern Australia from Paynes Find in Western Australia eastwards into South Australia. There is also an anomalous specimen at Cooper Creek in Queensland. A weeping form of the species that grows at Roxby Downs, South Australia bears the common name '''water myall'''.<ref name=FOA/> It is commonly situated on low limestone rises, saline or clay flats where it grows in calcareous sandy loam or clay soils.<ref name=FloraBase/>
==See also== *List of ''Acacia'' species
==References== {{Wikispecies|Acacia papyrocarpa}} {{Reflist}} * {{cite book|author1=Mitchell, A. A. |author2=Wilcox, D. G.|year=1994|title=Arid Shrubland Plants of Western Australia, Second and Enlarged Edition|publisher=University of Western Australia Press, Nedlands, Western Australia|isbn=978-1-875560-22-6}}
{{Taxonbar|from=Q4670981}}
Category:Flora of South Australia Category:Acacias of Western Australia papyrocarpa Category:Fabales of Australia Category:Taxa named by George Bentham