Tree, to 12 (20) m tall, ca 30 cm dbh; branchlets sometimes ribbed below petioles, tomentose when young, glabrate in age, lenticellate. Petiole and rachis tomentose; petioles winged or not, 8-40 mm long; rachis winged; leaflets in 4-8 pairs (rarely 9 or 10), oblong-elliptic to lanceolate, acuminate, obtuse to rounded at base, tomentose to sparsely pubescent, more densely on veins, the terminal pair 4.5-12 (17) cm long, 2.5-5.5 cm wide. Spikes axillary or terminal, in groups of 1 to many; peduncles 3-5 (7) cm long, tomentose; rachis 1-3 (5) cm long, tomentose; bracts ca 3 mm long; calyx densely villous, 11-19 mm long, sometimes striate or minutely ribbed, the lobes acute, ca 3 mm long; corolla lanate, 15-20 mm long, the lobes acute, ca 4 mm long; stamens and style to 80 mm long. Legumes terete, densely tomentose, usually less than 15 cm long (to 30 cm), to 2 cm wide, usually curved, the base blunt, the apex pointed, the margins prominently raised, the lateral margins rounded and narrowly ribbed, the intervening area of the valve minutely transversely ribbed. Zetek 3464.