branches armed; petioles unarmed, channelled; leaves paripinnate, leaflets elliptical, obovate, ovate, or ovato-lanceolate, obtuse or acute, crenulate, sessile, sub-unequal at base; panicles axillary and terminal, puberulous; flowers 4 parted; ovary single, ovoid; style filiform, equalling the petals; stigmas capitate. A large, much branched shrub or small tree, the branches and twigs armed with sharp, strong, horizontal, solitary prickles, usually placed under the insertion of the petiole. Leaflets in 4–5 pairs, opposite or alternate, 1/2–1 1/2 inch long, 2–6 lines wide, the lowest smallest, the rest gradually larger, very variable in shape, with a translucent gland in each serrature, and sometimes sparsely pellucid dotted. Panicles many flowered, shorter than the petioles. Petals of the ♂ flowers oval, concave, very obtuse; of the ♀, ovato-lanceolate, sub-acute, keeled.
