Pedley Acacia oswaldii, commonly known as boree,[2] umbrella wattle, umbrella bush, whyacka, middia, miljee, nelia and curly yarran,[3] is a shrub or tree of the genus Acacia and the subgenus Plurinerves.

[3] Leaves are hairy when young, becoming hairless, edges smooth, with a straight often sharp point.

[4] The simple inflorescences forms singly or in pairs in the axil of the phyllodes supported on hairy peduncles that are 0 to 1 millimetre (0.00 to 0.04 in) long.

[4] The distribution is wide but scattered throughout arid, semi-arid and subtropical areas in all states on the mainland, occurring mainly in calcareous sands or loamy soils.

[3] The species was initially described by the botanist Ferdinand von Mueller in 1863 in the journal Fragmenta Phytographiae Australiae.