Deciduous large tree, trunk and branches armed with prickles. Leaves digitately compound, long petioled and glabrous; leaflets 3-9, almost entire; stipules small, deciduous. Inflorescence axillary or subterminal, solitary or fasciculate, clustered at the end of branchlets; peduncle marked with 2-3 scars. Calyx leathery, cup-shaped, truncate, 3-5 lobed, deciduous and splitting irregularly, calyx tube with 2-3 scars. Petals narrowly obovate-oblong or elliptic-oblong, often pubescent. Staminal tube inflated, stamens numerous, multiseriate polyadelphous (mostly in 5 bundles), antipetalous; anthers rarely dithecous in the inner-most series of the filaments. Carpels 5, syncarpous; ovary-locular; style clavate, divided into 5 spreading branches at the top. Capsule dehiscing by 5 longitudinal valves, woody or coriacous, woolly within. Seeds smooth, globose.