Strap wattle

Acacia holosericea is a thornless, small-sized and evergreen tree growing up to 8-10 m high.

The bark of Acacia holosericea is grey light brown-coloured and densely lenticellate.

The leaf of Acacia holosericea is actually an expanded petiole resembling and having the function of a leaf, a phyllode.
The phyllodes of Acacia holosericea grow alternately on the stem (spirally arranged).
The phyllode is coriaceous and densely covered with short hairs (silky) on both sides. It is greyish-whitish and light green-coloured.
The phyllode of Acacia holosericea is 15-20 cm long and 3-5 cm wide. The shape is elliptic and falcate, the apex is obtuse or acute, the base is attenuate and the margins are entire.
The phyllode has parallel and arching veins.

The flowers of Acacia holosericea are grouped in axillary and terminal spikes. The bright-yellow spikes are 5-8 cm long and have a 0.5 cm peduncle.
The calyx-tube is cup-shaped with 5 short and triangular lobes. The calyx is light green yellowish and glabrous.
The corolla is composed of 5 yellow-coloured and glabrous petals. The petals are ovate-lanceolate and recurved, about 1 mm long and 0.6-0.7 mm wide.
The androecium is composed of numerous and bright yellow stamens. The filaments are 1.5-2 mm with tiny and globular anthers.
The style is yellow-coloured, 2.5-3 mm long and the stigma is simple.
The ovary is globose and about 1 mm across.
The flowers are fragrant.
 

The fruit of Acacia holosericea is a spirally twisted pod. The pod is 8-12 cm long and 0.4 mm wide, flattened and it usually contains 6-12 seeds. The pod is brownish-coloured and woody when ripe.

The seeds of Acacia holosericea are oblong-ovate, 4-5 mm long and 2-3 mm wide. The seeds are black-coloured with a long showy yellow-coloured and fleshy funicle.

Acacia holosericea "grows fast, it has a dense crown and fixes nitrogen and has vigorous colonizing characteristics. These make it ideal for revegetation and restoration of degraded land (mining sites) and fixation of sand dunes". (Orwa C., Mutua A., Kindt R., Jamnadass R., Anthony S., 2009, Agroforestree Database: a tree reference and selection guide)

The dried phyllodes of Acacia holosericea are sometimes used as fodder.

The seeds of Acacia holosericea are edible.