Small to medium-sized tree to 13 m tall and 30 cm d.b.h; bark smooth to longitudinally ridged; twigs puberulous to subpuberulous, terete, thick with a large pith, foul-smelling when broken (as the inner bark) with an odor rem- iniscent of horse urine. Leaves digitately (5-)7-9-foliolate; the leaflets more or less obovate or oblanceolate, acute, attenuate-cuneate, membranaceous, secondary veins 7-13 on a side, above and beneath simple puberulous especially along veins, densely impressed-lepidote, usually with a few plate-shaped glands along the midvein beneath, drying more or less olive above and brownish beneath, the terminal leaflet 8.2-16.5 cm long and 3.1-7.2 cm wide, the first intermediate pair 6.7-17.5 cm long and 2.5-7.0 cm wide, the second pair 5-15.2 cm long and 2-5.6 cm wide, the third pair 2.7-6.5 cm long and 0.9-2.9 cm wide, the fourth pair when present smaller, the terminal to basal petiolules 0.2-2.3 cm, 0.2-1.6 cm, 0.2-0.9 cm, and 0.2-0.7 cm long respectively; petiole 6.6-15.5 cm long, puberulous as the petiolules. Inflorescence a flat-topped, terminal panicle of few to many flowers, its branches puberulous. Flowers with a musky odor, only a few opening at a time; calyx widely campanulate, shortly 5-lobed, lepidote and simple-puberu-lent, 1-2 mm long and 2-4 mm wide; corolla yellow ventrally and orangish-brown dorsally outside, inside the ventral throat and most of the lower 3 lobes yellow, the dorsal 2 lobes brownish at the edges of the lower 3 lobes and the dorsal part of the throat, urceolate, 1.0-1.6 cm long and 7-8 mm wide, the tube 9-10 mm long, the upper 2 lobes 0.2-0.3 cm long, the 3 lower lobes 0.4-0.3 cm long, simple-puberulent outside, short-pubescent inside on the edges of the lobes with long, simple trichomes on the lower lobe, in the floor of throat, and sparsely at the level of stamen insertion; stamens didynamous, the anther thecae divaricate, pubescent, less than 1 mm long, the filaments pubescent, the longer pair 0.8-1.0 cm long, the shorter pair 0.6-0.7 cm long, the staminode 0.4 cm long, inserted 1-3 mm from base of corolla tube; pistil curved to fit against the corolla roof, 1.1 cm long, the ovary linear-conical, 2 mm long, 1 mm wide, strongly lepidote and somewhat simple-puberulous, the ovules multiseriate; disc pulvinate, inconspicu-ous, 0.5 mm long and 1.5 mm wide. Capsule linear, corkscrew-twisted, 45-100 cm long and 0.9-1.5 cm wide, terete, longitudinally finely ridged, somewhat sim-ple-puberulous; seeds thin, bialate, 0.9-1.5 cm long and 7.0-13.5 cm wide, the wings hyaline-membranaceous, sharply demarcated, narrow, long, irregular-ended.
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