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Leaves 10–21 cm long; petioles (6)8–20 mm long including a 2–4 mm long pulvinus; rachis deeply canaliculate with raised winged margins, pubescent; leaflets in 8–21 pairs, overlapping or contiguous, 2–3 times longer than broad, middle leaflets or those next to the proximal largest, proximal leaflet pairs 1–4 × 0.5–1.5 cm, the middle ones 2.5–6.5 × (0.5)0.8–2.5 cm, the distal ones 2–5.5 × 0.8–1.6 cm, oblong, lanceolate or elliptic, rounded or obliquely obtuse at the apex (so that the distal side of the lamina appears to be longer than the proximal side), obliquely round or cordate at the base, puberulous with antrorse hairs; midvein central or subcentral, with 3–4(5) secondary veins from the proximal leaflet base.
Flowers 4–5 × 3–4 mm; pedicels up to 2–3 mm long; bracteoles 4–6 × 3–4 mm, elliptic or orbicular, densely puberulous.
Stipules caducous, 10–22 × 1.5–3 mm, free, linear, lanceolate, sometimes falcate, puberulous; auricles absent.
Inflorescences in terminal and/or axillary panicles up to 7 cm long; pubescent.
Pods 8–14 × 3–4 cm, oblong to obovate, with spreading ventral flanges.
Ovary 2–3 × 1–1.5 mm; stipe to 1–2 mm long; style to 7–8 mm long.
Stamens 10, united to 1–2 mm at the base; filaments 7–10 mm long.
Sepals 5, 2–3 × 1–1.5 mm, elliptic to orbicular, imbricate.
Young branchlets densely puberulous with antrorse hairs.
Tree up to 12 m tall; bark reticulately fissured.
Seeds 15–20 × 12–15 mm, oblong to ovoid.
Dormant axillary buds ovoid or globose.
Petals absent.
