Trees, 5-12 m tall. Bark grayish brown, with conspicuous whitish lenticels. Branchlets of current year ferruginous or whitish puberulent, glabrescent. Leaves 20-25 cm, without stipules; rachis sulcate, puberulent; pinnae opposite, subopposite, or alternate, 5-10 pairs; leaflets alternate, 8-12 pairs, subsessile, with subulate stipels; blades oblong, 2.5-5 × 1-1.5 cm, both surfaces silky pubescent, both ends rounded, base slightly oblique, apex sometimes emarginate. Racemes puberulent. Flowers polygamous, pendulous, whitish or tinged with purple, long pedicellate. Bracts small or absent. Receptacle deeply concave, 5-6 mm, puberulent. Sepals subulate, slightly shorter than receptacle. Petals oblong, slightly longer than sepals, hairy, apex obtuse. Filaments pubescent. Ovary sessile, glabrous, 4-ovuled; style short, thick; stigma capitate. Legume oblong, 7-10 × 3-4 cm, compressed or turgid, glabrous, apex shortly beaked. Seeds 2-4, blackish, subglobose, slightly compressed, ca. 2 cm in diam., glabrous. Fr. Aug. 2n = 28*.
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A tree. It grows 9 m high. The leaves are large and up to 1 m long. They have up to 24 oblong leaflets. These can be 35 mm long. Trees are separately male and female. The flowers are lilac coloured. The are along downy clusters. The fruit is pulpy and 10 cm long. There are 2-4 seeds that are blackish and 2 cm across.
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