Pods straight or somewhat curved, not spirally twisted; at maturity the valves separating from the persistent margins, but not splitting into segments; the outer layer (exocarp) of the pod-wall often peeling off the inner layer (endocarp), the layers remaining intact or breaking irregularly.
Stamens 10, fertile, free among themselves, slightly adnate to the corolla; filaments c. 4-7·5 mm. long; anthers with a usually very caducous apical gland.
Inflorescences of spiciform racemes which are axillary, solitary or clustered, often ± aggregated; pedicels c. 1-2 mm. long.
Leaves 2-pinnate, pinnae mostly with many pairs of leaflets.
Calyx gamosepalous, small, c. 1-2·5 mm. long, with 5 teeth.
Small trees, shrubs or suffrutices, unarmed.
Flowers normally hermaphrodite.
Seeds ± compressed.
Petals 5, free.