Unarmed trees, usually large, the branchlets pubescent or glabrous. Leaves bipinnate, moderate or large, 2-or few-ranked; petiole prominent, bearing a gland usually near the middle; pinnae few to many, opposite, the rachis bearing glands especially terminally; leaflets usually numerous and small, inequilateral; stipules inconspicuous, caducous. Inflorescence of solitary to fasciculate pedunculate heads, axillary, or paniculate by insertion at defoliate nodes; peduncles slender; heads small, globular; flowers condensed, sessile, small; bracts small and inconspicuous. Flowers whitish; calyx campanulate to tubular-funnelform, valvate, briefly 5-dentate; corolla more or less funnelform, 5-lobed, valvate, about double the calyx; stamens 10 to many, exceeding the corolla, united below into a short, included staminal tube; anthers small, eglandular, quadrangular; ovary sessile, several-ovulate; style slender, equalling or exceeding the stamens, the stigma small. Legume diagnostic, circinnate or reniform, coiled into a complete or nearly complete circle, compressed or almost flattened but nevertheless somewhat fleshy, usually glabrous and lustrous, fairly broad, ligneous, indehiscent, septate between the seeds, the seeds transverse.
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Trees, unarmed. Leaves bipinnate; stipules not conspicuous; petiole with gland; pinnae and leaflets in numerous pairs. Heads globose, solitary or in racemes, axillary. Flowers dimorphic or uniform, bisexual. Calyx campanulate, shortly 5-dentate. Corolla funnel-shaped, 5-lobed. Stamens numerous, basally connate into a tube; anthers eglandular. Ovary sessile, many ovuled; style filiform. Legume broadly circinate or incurved-reniform, thick, hard, not dehiscent; mesocarp spongy, at length hardened. Seeds transverse, compressed, with pleurogram; funicle filiform.
Calyx c. 2.5 mm, pubescent especially at the apex of the lobes Fruits curved in a flat plane into a complete circle, or woody, or curled; seeds biseriate, without pulp
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