Large flat-crowned tree. Bark grey, usually rough with shallow squares, like scales; young branches densely covered in rusty-brown hairs. Stipules ovate, c. 5-12 × 3-8 mm. Leaves bipinnate with 5-8 pairs of pinnae; leaflets in 9-17 pairs per pinna, oblong to almost rectangular with the midrib diagonally across, rounded and lacking a "heel", dark green above, densely pubescent all over the surface beneath; rhachis and petiole hairy with a gland at the base. Flowers in semi-spherical heads, creamy-white; staminal tube greenish (rarely pink or red), exserted up to 2.5 cm beyond the corolla. Pod dehiscent, pale brown, oblong, not glossy, densely and persistently pubescent. The pods take more than 9 months to mature.