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A shrub or small tree. It grows to 7 m high. The bark is dark brown or red. It loses its leaves during the year. The leaves are like acacia. They are compound with 14-41 pairs of stalks each with 20-48 pairs of leaflets. The leaflets are 1.2 cm long. The bases of the leaflets are unequal. The flowers are small and cream. They occur in spikes in the axils of leaves. The fruit is a long pod. It is 45 cm long by 1.3-3 cm wide. As the pod splits open the edges remain on the tree as long woody threads.
Leaves up to 53 cm. long (rhaehis + petiole), glabrous or nearly so; pinnae 3-41 pairs; leaflets 9-48 pairs, 3·5-22 x 0·7-8 mm., linear-oblong to narrowly oblong, glabrous; midrib starting in the distal corner of the leaflet-base, gradually becoming almost central in the leaflet; proximal side of the base rounded and almost auriculate; apex acute to rounded and mucronate and nearly symmetric; lateral nerves and veins not or scarcely visible.
Shrub or small tree 1-7 m. high, deciduous; bark grey-brown to dark dull brown or red; young branchlets glabrous becoming blackish.
Racemes (5)8-20(23) cm. long (including the peduncle), glabrous; minute whitish mealy glands present round the pedicel-bases.
Flowers variously described as yellow, or with brownish-violet petals and yellow stamens.
Pods (15)25-44 x 1·3-3 cm., linear, the seeds showing as bumps at intervals.
Seeds 11-20 x 9-18 x 7-12 mm., ellipsoid to lenticular.
Petals 2·5-3 mm. long.
