Acacia pruinosa, commonly known as the frosty wattle, is a species of Acacia native to eastern Australia.[1]
The spreading shrub or tree typically grows to a height of 1to and has smooth bark with terete branchlets. The glabrous leaves are in length and have one prominent gland near the middle of the lowermost pair of pinnae. There are between one and five pairs of pinnae that have a length of and 7 to 20 pairs of oblong pinnules that are in length and wide. The plant flowers between August and October producing 4 to 19 inflorescences in panicles that have an axis with a length of . The spherical flower-heads with a diameter of contain 40 to 60 yellow to bright yellow flowers. After flowering leathery straight to curved, flat seed pods form with a length of and a width of .[1]
The type specimen was collected by the botanist Alan Cunningham in 1827 on the Liverpool Plains of New South Wales.[2]
It is found in northeastern New South Wales from around Uralla in the south stretching north into southeastern Queensland. It is often a part of dry sclerophyll forest and woodland communities and grows in sandy and skeletal soils over and around granite.[1]