Acacia baileyana, also known as Cootamundra wattle or golden mimosa, is a small to medium-sized evergreen tree that is native to southeastern Australia. It is a fast-growing tree that typically grows to a height of 6-10 meters, with a spread of 3-6 meters.

The leaves of the Acacia baileyana are gray-green, feathery, and bipinnate, with 8-20 pairs of small leaflets per pinna. The leaflets are oval or oblong, about 5-15 mm long, and about 1-3 mm wide.

The tree produces abundant, fragrant, bright yellow flowers in late winter or early spring, which are borne in rounded clusters about 4-8 cm in diameter. The flowers have a fluffy appearance due to the numerous stamens, which are golden-yellow in color.

The fruit of the Acacia baileyana is a flat, oblong, dark brown pod, which is about 10-20 cm long and 1.5-2.5 cm wide. The pods split open when mature to release the seeds.

Acacia baileyana is widely cultivated as an ornamental tree in gardens and parks, both for its attractive foliage and for its abundant, showy flowers. It is also used for erosion control and as a nitrogen-fixing plant in reforestation projects. The tree is tolerant of a range of soil types and climates, but prefers well-drained soils and full sun.