Shrub or small tree up to 6 m high, all young parts greyish pubescent. Stipules linear, 3-4 mm long, early caducous. Leaves with 2 pairs of leaflets; petiole slender, puberulous, c. 3 cm long; rachis slender 1-3 cm, bearing an oblong, nipple-shaped gland between the lower pair of leaflets. Leaflets membranaceous, obliquely ovate, very unequal-sided, upper pair much larger than the lower one, 4-16 by 2-7 cm; glabrous or glabrescent on upper side, puberulous on lower; apex acute to acuminate, base obliquely cuneate; petiolules c. 3 mm. Racemes short, densely flowered, up to 6 cm long including the 2 cm peduncle; bracts narrowly lanceolate to subulate, 2-4 mm, early caducous; pedicels long, slender, puberulous, 2-3 cm. Sepals oblong-obovate, yellowish green often mingled with red, puberulous, 7-11 mm. Petals yellow, pubescent on both sides, broadly obovate to orbicular, 2-2.5 cm. Stamens 1 (or 6): 3 with filaments filiform, 2-4 mm long and anthers glabrous, strongly curved, 6-7 mm, rostrate at apex, opening by an apical pore; 4 (or 3) with filaments dilated distally, 2-3 mm and anthers similar but thicker and 8-9 mm long; upper 3 stamens usually absent. Ovary sessile, densely appressed pubescent, style slender, stigma inconspicuous. Pods terete, pendulous on a short, stout stipe, 15-25 cm long, 1-1.5 cm in diam., long beaked, slightly annulate. Seeds 80-100 embedded in a foetid, black pulp, compressed ovoid, 5-6 mm, dark brown.
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Shrubs or small trees, ca. 3 m tall. Branches grayish white, glabrous. Leaves 12-18 cm, with an oblong, convex gland on rachis between lower pair of leaflets; stipules early caducous, linear, 3-4 mm; petiolules 3-4 mm; leaflets 2 pairs, obliquely oblong-ovate, 4-16.5 × 2-7 cm, membranous, both surfaces pubescent when young, abaxially puberulent when old, base obliquely cuneate, very unequally sided, midvein near upper side, apex acute to acuminate. Racemes short, densely flowered, to 6 cm, in axils of apical leaves, several racemes forming a leafy panicle; bracts early caducous, narrowly lanceolate. Sepals yellowish green, often tinged with red, oblong-obovate, outside puberulent. Petals orange-yellow, broadly obovate to orbicular, 2-2.5 cm, both sides pubescent. Fertile stamens 6 or 7, opening by apical pores, upper 3 stamens usually absent. Ovary linear, densely appressed whitish pubescent. Legume pendulous on a short stout stipe, terete, 15-25 × 1-1.5 cm, slightly annulate, with a beak ca. 1 cm on top. Seeds 80-100, dark brown, compressed, ovoid, 5-6 mm, embedded in a foetid, black pulp. 2n = 28.
A shrub. It grows 1-2 m tall. The branches are hairy. The flowers are yellow. The pods are cylinder shaped. They are 20-22 cm long and 1 cm wide.
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