Tree up to 35 m high, free bole up to 10 m, 66 cm in diameter. Leaves: rachis 16-34(-45) cm, subglabrous or ± tomentellous; petiole 4.5-10 cm, with a gland 0.5-2.5 cm above the base, 1-4 mm long, circular to elliptic, flat or slightly sunken into the rachis; pinnae 7-10 pairs, 4-16 cm long; leaflets 6-18 pairs per pinna, alternate, trapezoid-oblong, (8-) 12-29 by 6-13 mm, base strongly asymmetrically truncate, apex broadly rounded, asymmetrical, often emarginate, both surfaces glabrous; main vein starting near the basiscopic margin and running diagonally over more than the middle third of the leaflet towards the acroscopic side of the apex, lateral veins prominent, reticulate. Inflorescences tomentellous, up to c. 16 cm long. Flowers: pedicel 2-10 mm. Calyx yellow to yellow-brown, (cylindrical to) obconical, often nearly bilabiate, 11-15 mm long, tomentose; teeth, when regular, triangular, acute, 2-5 mm long. Corolla yellow to yellow-brown, funnel-shaped, 23-32 mm long, woolly, lobes (elliptic-) oblong, 10-20 mm long; tube shorter than or ± as long as the calyx. Stamens white, up to 50 mm long, tube only slighdy exceeding the corolla-tube. Ovary sessile, glabrous. Pod black, woody, oblong, sometimes slightly twisted, sometimes wider in the distal part, 5.5-18 by 3.8-5.8 cm, margins slightly raised, valves with numerous hardly visible transverse anastomosing veins and often with 3-5, slightly branched, raised, accessory veins; epicarp pealing off at maturity, endocarp woody. Seeds ellipsoid, 12.5-14.5 by 6-7.5 mm, areole oblong, pleurogram parallel to the margin, open towards the hilum.
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