Trees, 2-10 m tall, unarmed. Branchlets terete. Branchlet, petiole, and inflorescence shortly brown tomentose. Pinnae 1 or 2 pairs; leaf rachis and base of petiole with round, sunken glands; leaflets 2 or 3 pairs in lower pinnae, 4 or 5 pairs in upper pinnae, adaxially shiny and deep green, obliquely ovate or oblong, 5-9(-11) × 2-4.5 cm, apical ones larger, opposite, proximal ones alternate and smaller, both surfaces glabrous or puberulent on veins, base oblique, apex acuminate, mucronate. Heads globose, 10-20-flowered, arranged in panicles; peduncles to 1.5 cm. Flowers sessile. Calyx less than 2 mm, calyx and corolla shortly brown tomentose. Corolla white, 4-5 mm; lobes connate at middle. Staminal tube slightly shorter than corolla tube. Ovary shortly stipitate, glabrous. Legume twisted into a circle, 2-3 cm wide, margin between seeds constricted. Seeds black, ca. 1.5 × 1 cm. Fl. Apr-Jun, fr. Jul-Dec.
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