Racosperma parramattense (Tindale) Pedley 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 15 m (49 ft) in height with phyllodes (flattened leaf stalks) instead of true leaves.

A fast-growing plant, it regenerates after bushfire by seed or suckering and can quickly colonise disturbed areas.

Rough and furry when young before losing their fur, they are 2.5–11 cm (1–4+1⁄4 in) long and 3.5–8 mm (1⁄8–3⁄8 in) wide and sub-moniliform—linear in shape and slightly swollen over the spaces where the seeds are.

An analysis of genomic and chloroplast DNA along with morphological characters found that the section is polyphyletic, though the close relationships of many species were unable to be resolved.

[3] A component of dry sclerophyll forest or woodland, it is found in association with such trees as forest red gum (Eucalyptus tereticornis), Sydney blue gum (E. saligna), mountain white gum (E. dalrympleana), rough-barked apple (Angophora floribunda), turpentine (Syncarpia glomulifera), or in drier locations with gossamer wattle (Acacia floribunda), coast myall (A. binervia), or early green wattle (A.

[2][10] The bark of A. parramattensis is thin and offers little protection from bushfire, with plants generally perishing from high intensity fires.

[11] Most above-ground growth is killed by fire, though plants with trunks thicker than 10–15 cm (4–6 in) diameter at breast height (dbh) may resprout from epicormic buds.

[13] The wood serves as food for larvae of the jewel beetle species Melobasis nitidiventris, Agrilus hypoleucus and A.

[14] Older trees that are infested by borers in turn attract the insectivorous yellow-tailed black cockatoo.

[6] Fieldwork conducted in the Southern Highlands found that the presence of bipinnate wattles (either as understory or tree) was related to reduced numbers of noisy miners, an aggressive species of bird that drives off small birds from gardens and bushland, and hence recommended the use of these plants in establishing green corridors and revegetation projects.