Woody climber, shrub or tree with pendent liane-like branches, up to 15 m. tall.. Branchlets brown pubescent to tomentellous, soon glabrescent.. Leaves 20–47 cm. long; stipules subulate to ovate-acuminate, 3–4 mm. long, caducous; rhachis prolonged ± 2–3.5 cm. beyond the distal pair of leaflets, glabrous to thinly pubescent; stipels 1–2.5 mm. long; lateral leaflets in (1–)2–4 pairs, oblong or elliptic-oblong, 8–18 cm. long, 3.5–8 cm. wide, obtuse or acuminate, narrowed to the shortly rounded or cordate base, asymmetric, chartaceous, glabrous above except sometimes for a few hairs on the nerves, subglabrous to appressed puberulous beneath (indumentum conspicuous only with a lens); primary lateral nerves 4–6(–7) on either side, prominent; venation lax, fine and slightly raised.. Panicles terminal and axillary (sometimes the latter reduced and few-flowered), up to 18–60 cm. long, with usually numerous ascending branches; axes brown pubescent to velutinous; fascicles of mature panicles not very crowded; bracts subtending fascicles and flowers linear-lanceolate to ovate, 1–2 mm. long.. Calyx 2.5–4 mm. long, brownish tomentellous.. Corolla 7–9(–12) mm. long, cream or white, sometimes with small scattered hairs mostly on the keel and wings; wings as long as the keel.. Fruit linear-oblong or oblong, not winged, rounded at the ends, subsessile, 6–10 cm. long, 1.8–3 cm. wide, papery, densely appressed pubescent, ultimately glabrescent, laxly venose, 1–2-seeded.
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Flowers rather small but variable in size, fragrant, white or purplish in panicles up to 18 in. long.
A lofty woody climber, with stem sometimes 1 ft. in diameter