DC., Mém. Leg. 12:439.1826 Tree, to 8 m tall; branchlets, petioles, rachises, leaflets, below, and midribs above densely short-pubescent; lenticels +/- prominent, small. Petiole and rachis not winged; leaflets in 4-8 pairs, variable in shape, asymmetrical, mostly narrowly ovate to elliptic, acute to long-acuminate, obtuse to rounded at base, puberulent above except on midrib, the terminal pair 7-10 (15) cm long, 2.5-4 (6) cm wide. Spikes axillary or terminal, in groups of 1-4; peduncles 3-4 cm long, densely tomentose; bracts 1 mm long; calyx 3-5 mm long, the lobes acute, ca 0.5 mm long, tomentose; corolla 14-20 mm long, sericeous-villous, the lobes to 1.5 mm long. Legumes flat, 6-20 cm long, 1.5-2.5 cm wide, bearing dense short, ferruginous-tomentose pubescence, the marginal ribs prominent. Foster 703, Shattuck 1122.