Bark very coarsely flaky. Dead bark layered.
Leaflet blades almost sessile, about 1.5-4 x 1-2.5 cm, the leaflet stalks only 1 mm or less in length. A gland or pair of glands normally present on the upper surface of the compound leaf petiole where the secondary axes are attached. Similar glands occur on the upper surface of the secondary axes just below the point of attachment of the leaflets. Stipules small and inconspicuous. Leaflet apex mucronate.
Flowers in long peduncled umbels or heads with the central flower in each umbel larger than the others. Calyx and corolla both clothed in yellowish hairs. Calyx about 7 mm long, corolla about 14 mm long. Staminal filaments pink in the upper half, but white in the lower half. Staminal filaments about 35-40 mm long.
Pods hard and woody, about 20-25 x 2 cm. Seeds +/- transversely oriented in the pod, flat, up to 15 mm long.
Cotyledons rather fleshy, venation obscure. First pair of leaves compound, one leaf usually pinnate and the other bipinnate; petiole, compound leaf axes and leaflets hairy, at least when young. At the tenth leaf stage: leaves bipinnate with about 16-20 leaflets; small raised glands normally visible on the upper surface of the compound leaf axis between the attachment points of the secondary axes; all parts of the compound leaf hairy at least when young; stipules filiform. Seed germination time 8 to 16 days.