Acacia parramattensis, commonly known as Parramatta wattle, is a tree of the family Fabaceae native to the Blue Mountains and surrounding regions of New South Wales. It is a tall shrub or tree to about in height with phyllodes (flattened leaf stalks) instead of true leaves. These are finely divided bipinnate . The yellow flowers appear over summer. It generally grows in woodland or dry sclerophyll forest on alluvial or shale-based soils, generally with some clay content. A fast-growing plant, it regenerates after bushfire by seed or suckering and can quickly colonise disturbed areas. Likewise it adapts readily to cultivation and is used in revegetation projects. Description Growing with an upright habit, Acacia parramattensis is a tall shrub or tree ranging from in height with smooth bark that can be dark green, dark brown or black. The branchlets are more or less terete (round in cross-section), sometimes with ridges. The tips of new growth are yellow and finely furry becoming smooth with age. The dark green and slightly rough leaves are joined to the stem by a long petiole and are finely divided or bipinnate—that is, each leaf has 3–16 pairs of long pinnae (leaflets) arising from it, and each of these pinnae has anywhere from 14 to 62 (most commonly 20 to 40) pairs of pinnules off it. Each pinnule is 2 to 7 (rarely 9) mm long and 0.5–1 mm wide and linear or cultrate in shape. The yellow flowers appear from November to February, occasionally as late as April. The yellow flowers are spherical and measure in diameter. they are arranged in panicles or racemes, with 25 to 50 flowers occurring in each flower head. Flowers are followed by the development of the flat grey-black seed pods. Rough and furry when young before losing their fur, they are long and wide and sub-moniliform—linear in shape and slightly swollen over the spaces where the seeds are. The mature seeds are released over November to January. A. parramattensis tends to flower later in the year than the similar early green wattle (Acacia decurrens) and black wattle (A. mearnsii). Taxonomy Australian botanist Mary Tindale of the Royal Botanic Gardens, Sydney described Acacia parramattensis in 1962 from material she collected in 1960 from Hazelbrook in the Blue Mountains near Sydney. Its name is derived from the locality of Parramatta, west of Sydney. Common names include Sydney green wattle and Parramatta wattle.