Tree up to 20 m or more, diameter 30 cm or more. Leaves: rachis (17-)20-30(-55) cm, shortly tomentose, petiole 4.5-7.5 cm, with 1 or 2 gland(s) in the lower half of the petiole, c. 1.5 mm in diameter, 1.5 mm high, raised; pinnae 9-12 pairs (up to 20 pairs in juvenile plants), alternate to opposite, up to 13 cm long; leaflets (15-) 18-23(-30) pairs per pinna, alternate, oblong, only slightly curved, 10-15(-16) by 4-7(-7.5) mm, base asymmetrically truncate, apex asymmetrically rounded to broadly obtuse, sometimes slightly emarginate, upper surface glabrous or nearly so, lower glabrous or with a few scattered hairs, main vein starting from the basiscopic margin, diagonal across the central third of the lamina, lateral veins prominent beneath. Inflorescence composed of ± corymbiform arranged racemes, 4-5 cm long. Flowers: pedicel 4-10 mm long. Calyx broadly obconical, often slightly bilabiate, 10-13 mm long, yellowish to ferrugineously tomentose; teeth unequal, triangular, acute, 3-4 mm long. Corolla funnel-shaped, 27-36 mm long, yellowish or ferrugineously woolly, lobes oblong, acute, 15-20 mm long; tube slightly to strongly exserted beyond the calyx. Stamens to c. 50 mm long, tube shorter than the corolla. Pod oblong, woody, blackish brown, minutely puberulous, 20 by 6-6.5 cm, margins raised; valves with 4 or 5 rather straight and forked raised veins and with numerous small prominulous transverse not raised ones, not bullate over the seeds. Seeds narrowly ellipsoid, c. 17 by 6.5 mm, areole narrowly elliptic, c. 15 by 4 mm, pleurogram open towards the hilum.
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