Acacia harpophylla

Acacia harpophylla subsp. var.	Brigalow
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	Fabaceae > Acacia harpophylla var. ,

Acacia harpophylla, commonly known as the Brigalow , Brigalow Spearwood or Orkor is an endemic tree of Australia. It is found in central and coastal Queensland to northern New South Wales. It can reach up to 25 meters tall and forms extensive open-forest communities on clay soils.

Two species, brigalow (A. harpophylla) and gidgee (A. cambagei) form open woodlands on flat and gently undulating terrain on heavy and relatively fertile clay and clay-loam soils primarily in the 300-700mm annual rainfall region of Eastern Australia. These woodlands extend from a northern extreme of 20o S into northern New South Wales. Brigalow and gidgee occur as mixed communities in some regions and are commonly associated with several other woody species, including overstorey species such as Eucalyptus coolabah, E. cambageana, Casuarina cristata, and a range of understorey species . A. tephrina, A. georginae and A. argyrodendron also occupy similar habitats and have similar habits and growth forms, but are less widespread, while a number of other Acacia species also form structurally similar communities

Brigalow occurs from coastal regions receiving in excess of 900mm rainfall per year through to the semi arid 500mm rainfall region although it is primarily a semi-arid zone species . Gidgee (A. cambagei) replaces brigalow as rainfall drops in western regions and extends from 650mm-300mm . Gidgee, with a maximum height of approximately 12 metres is somewhat smaller than brigalow which can attain heights of 20 metres . In the north-western regions Black gidgee (A. argyrodendron) replaces brigalow in many areas, while in Central-Western districts Boree (A. tephrina) forms woodlands and shrublands, frequently on cracking clay soils and often in association with A. cambagei. Georgina gidgee (A. georginae) woodlands are found in more arid regions in the 200-250mm rainfall belt .

Standard Cyclopedia of Horticulture

Acacia harpophylla, F. v. M. A tree with slightly angular branchlets: phyll. striate, 3-5-nerved, falcate- lanceolate, tapering to both ends, 6-8 in. long, 1/3-3/4in. wide: fls. in clusters with peduncles 1/2in. long, or in short racemes, much shorter than phyfl., 15-20 fls. in a head; sepals not half so long as petals: pod striate, more or less constricted and contracted between seeds, 3-4, or even 5, in. long, 1/6in. wide; seed elliptic; funicle half as long as seed and but slightly enlarged into aril. CH The above text is from the Standard Cyclopedia of Horticulture. It may be out of date, but still contains valuable and interesting information which can be incorporated into the remainder of the article. Click on "Collapse" in the header to hide this text.

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