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A medium-sized tree, growing to 15 m high, spreading to several metres acorss.
It is found in NSW, south from Merriwa in the Hunter Valley, extending south to about Taralga. Then with a disjunction to the ACT where it extends south through the tablelands and coastal hinterland. It grows in Victoria, from the north-east of the state through to Melbourne with records also south of Horsham.
It generally grows in dry to moist sclerophyll forest, often on sandstone.
Australian Wattles at least, can be broadly placed into 1 of 3 recognisable groups:
Phyllodes and bipinnate leaves are always alternate to clustered, never opposite.
This wattle belongs to Group 1.
Phyllodes (modified leaves) are obovate to narrowly oblanceolate, to about 15 cm long and to about 5 cm wide and grey-green in colour.
Acacia spp. produce small 5-merous flowers, with 5 very small petals partly-fused into a short tube which sits above a fused calyx. The stamens are the main feature which are produced in high numbers per flower (staminate flowers), surrounding a single style. In this species, flowers are arranged in globular heads, to 8 mm diameter, with up to 30 very small staminate flowers per head, yellow in colour. The heads are arranged in racemes or panicles, in phyllode axils, with up to 16 heads per raceme, occurring from August to December.
Seed pods are straight or slightly curved, to 15 cm long and to 2.5 cm wide.
A suitable plant for ornamental foliage.
Hardy in well-drained soils. Needs reasonable moisture to thrive.
Bright yellow flowers standout well against the grey foliage.
Acacias can suffer from a number of pests, including borers, scale, galls and leaf miners. Growing plants suitable to your local environment minimises these occurring.
Propagation is easy from scarified seed by covering with boiling water for 24 hours and discarding any seeds still floating on the surface.
Most wattles regenerate from seed after fire with some species exhibiting suckering from bases or trunks.
Acacia is a highly diverse genus, with over 1500 recognised species (placing it in the top-10 most-diverse plant genera) occurring in most continents except for Europe. Australia has about 970 spp., most of which are endemic. There are also about 10 exotic species. NSW has about 235 recognised species. Some species have become weeds in other states outside of their natural range (e.g., wattles from Western Australia into NSW and vice versa).
Acacia – from Greek Akakia – which refers to an Ancient Greek preparation made from one of the many species; the name of which derives from akis, meaning “thorn” – referring to the thorns of species in Africa.
obliquinervia – refers to the oblique venation of the phyllodes
This species is not considered to be at risk of extinction in the wild.
NSW Flora Online (PlantNET) – Acacia obliquinervia profile page
http://plantnet.rbgsyd.nsw.gov.au/cgi-bin/NSWfl.pl?page=nswfl&lvl=sp&name=Acacia~obliquinervia
Wattle – Acacias of Australia Online – Acacia obliquinervia fact sheet https://apps.lucidcentral.org/wattle/text/entities/acacia_obliquinervia.htm
Wrigley, J.W. & Fagg, M.I. (2001). Australian Native Plants – Propagation, cultivation and use in landscaping. 4th edition. New Holland Publishers, Pty. Ltd. Australia.