Shrub or tree up to 14 m. tall.. Young branchlets glabrous.. Leaves: petiole 3–8 mm. long, glabrous, the interpulvinary part shorter to longer than the upper pulvinus; lamina obovate-or oblanceolate-acuminate, (1.5–)2.5–6.8 cm. long, (0.8–)1.4–2.4 cm. wide, rounded and often asymmetrical at the base, coriaceous, glabrous on both surfaces.. Flowers solitary in the axils; pedicels 13–17 mm. long, glabrous; bracteoles reniform or semi-orbicular, ± 0.5 × 1.5 mm., ciliate, inserted immediately beneath the calyx.. Calyx 9–10 mm. long, glabrous, splitting down one side only.. Petals white; standard 12–15 mm. long; wings 10–14 mm. long; keel-petals 9–10 mm. long.. Stamen-filaments glabrous; anthers 1–1.5 mm. long.. Ovary glabrous.. Pod 6–8.5 cm. long, 1.6–1.8 cm. wide, brown.