Trees, small, to 10 m tall. Branchlets gray, terete, glabrous. Leaf petiole 1-4 cm; petiolar gland raised, pot-form, ca. 2 mm high, 0.5-3 mm in diam.; pinnae 1 or 2 pairs, with similar gland at apex; petiolules 3-7 mm; leaflets 2 pairs, opposite, elliptic, 8-14 × 4-8 cm, upper one larger, both surfaces glabrous, midvein central, lateral veins 3 or 4 pairs, connected by parallel veins, base attenuate, apex shortly acuminate. Heads 10-20-flowered, arranged in narrow panicles to 15 cm. Flowers white, fragrant, sessile. Calyx 2.5-3 mm, glabrous; teeth inconspicuous. Corolla campanulate, 7-8 mm; lobes linear-oblong, only margin pubescent. Staminal tube ca. as long as corolla tube; anthers minute. Ovary glabrous; stipe ca. 2.5 mm. Legume slightly curved or straight, cylindric, 4-10 × 2.5-3 cm, dehiscent along both sutures; valves brown, leathery, netted. Seeds 1-4, ca. 3 cm high, ca. 2.5 cm in diam., middle one shortly cylindric, ca. 2 cm high, both ends turbinate. Fl. May, fr. Jul.
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