Tree attaining 30 or 40 ft., extremities glabrous or minutely puberulous. Leaves 2–3–4-jugate, one leaflet of the terminal pair occasionally wanting, rachis 2 1/2–6 in., subterete; leaflets rather coriaceous, 3–8 (9) in. long, 1 1/2–3 (4) in. broad, oblong-elliptical or obovate-elliptical shortly acuminate or apiculate, rounded or broadly cuneate at base, glabrous and shining above, closely and obscurely silvery-sericeous with prominent midrib beneath, lateral nervures rather prominent, subdistant, curving forward; petiolules articulated to rachis, 2–4 lines long; stipules not observed. Flowers usually in short, fascicled, or sometimes solitary, compound or simple, axillary, rusty-puberulous racemes 1–2 in. in length, occasionally growing out to 4–6 in., pedicels 2–4 lines. Bracts very early caducous. Involucral bracteoles thinly coriaceous, 2 1/2–3 lines long. Calyx deeply 4-fid, tube very short, turbinate, 1 line or less, posterior lobe shortly bifid. Posterior petal obcordate-cuneate or cordate also at the base with a distinct claw, twice as long as the calyx; four smaller petals oval to obovate, often much shorter than calyx-lobes. Perfect stamens 3, exserted, remainder unequal, shorter than calyx, with imperfect or effete anthers. Ovary subsessile pubescent; style slender, glabrous. Ovules 4–5–8. Legume flat, thickly coriaceous, oblong or broadly oblong obtuse at each end, ventral suture thickened with a double laterally prominent margin, valves shortly tawny- or rusty-tomentose, obliquely rugose; 7 in. to 1 ft. long, 1 3/4–3 1/2 in. broad.
