Tree up to 45 m high, bole up to 15(-20) m, 100(-125) cm in diameter; buttresses usually small or absent, occasionally up to 1 m high, 2 m wide. Rachis of leaves, pinnae and inflorescence brownish tomentellous, ± glabrescent. Leaves: rachis (10-) 12-20(-25) cm, petiole (3-)4-9(-10) cm, with a gland in the lower half of the petiole; pinnae (10-)12-16(-22) pairs, subopposite, with gland(s) at the junctions of the 1-5 distal pairs of leaflets; leaflets (12-)18-25(-32) pairs per pinna, alternate, chartaceous, oblong (4-)5-9 by (1.5-)2-4 mm, apex obtuse, ± mucronulate, base obliquely truncate, main vein subdiagonal; upper surface subglabrous, lower surface densely puberulous, ± glabrescent. Inflorescence composed of (l-)2-4 (-5) pedunculate spikes, arranged in lateral racemes; pedicels indistinct, less than 1 mm long. Flowers: calyx broadly campanulate, often ± bilabiate, 3.5-4 (-5) mm long, teeth 1.7-3 mm long, unequal. Corolla funnel-shaped, (6-)7-8 mm long, densely ferrugineous sericeous outside, white inside, lobes triangular-ovate, 4-5 mm long. Stamens white, 12-20(-25) mm long, tube c. 2 mm long. Ovary c. 1 mm long, sessile, glabrous. Pod brown or blackish, ± oblong, sometimes slightly narrowed between the seeds, 9.5-18.5(-25) by (2-)2.5-4 (-7) cm, with thickened margins; valves with anastomosing veins, tardily dehiscent or indehiscent. Seeds ellipsoid, 13-26 by 3-9 by c. 1-2 mm, with an open areole.
Home