Tree, to 20 m tall, ca 30 cm dbh; outer bark coarse, becoming fissured and loosened in age; wood dark, hard, heavy. Leaves alternate, pinnate; stipules caducous, ovate-elliptic, to 2 cm long, persistent on juvenile plants; petioles to 6 cm long, puberulent; rachis 10-20 cm long; leaflets 7-15, alternate on rachis, oblong to ovate-oblong, obtuse and often slightly emarginate at apex, obtuse to rounded at base, 6-10 cm long, 2.5-3.5 cm wide, appressed-pubescent below when young, becoming glabrate in age. Panicles axillary or terminal, appearing just before or at same time as new leaves; branches, pedicels, and calyces sparsely to densely pubescent, the trichomes short, brown, appressed; pedicels 3-4 mm long; calyx 5-7 mm long, lobed to one-third its length, weakly bilabiate, the teeth acute; petals white, 1-1.4 (2) cm long; standard emarginate, clawed; keel petals fused at apex; stamens fused into a single tube with an open slit apically, markedly curved at apex, exceeded by the style. Legumes +/- oblong, flat, 6-8 cm long, ca 2 cm wide, borne on stipes ca 1 cm long, glaucous, glabrous, mostly 1-seeded (if 2-seeded, the fruit to 13 cm long), the winged area of equal thickness throughout; seeds discoid, to ca 1 cm diam, medial on fruit body. Croat 5320.