Trees to 20 m. tall, branchlets glabrous, conspicuously lenticellate. Leaves large, 5-foliolate; stipules lanceolate, 1-2 mm. long; petiole subterete to angular, 1-6 cm. long; rachis not winged, 2.5-9 cm. long; leaflets glabrous to lightly pubescent below along chief nerves, ovate-lanceolate to elliptic-lanceolate, long caudate-acuminate apically and broadly acute basally, 4-20 cm. long and 1.5-7 cm. broad, submembranaceous, prominently nerved beneath; petiolules gross, sul-cate above, 3-7 mm. long. Inflorescence many-flowered, up to 40 cm. long; peduncle lightly pubescent, somewhat angled; pedicels 1.3-2.5 cm. long; mature buds globose, verrucose, 7-9 mm. in diameter. Flowers 1-petalate; petal yellow, irregularly orbicular, dentate-fimbriate marginally, up to about 3.8 cm. long and broad, claw about 7 mm. long; calyx rupturing irregularly into 3-5 reflexed lobes; stamens many, apparently subequal, 8 or so lower filaments thicker than the rest, up to 1.5 cm. long; anthers bilocular, apically acute-subcaudate, up to 5 mm. long in larger anthers. Legume large, broad, flat, beaked, 2-2.5 dm. long and up to I dm. wide, splitting first along the ventral suture, the valves thick and somewhat elastic; seeds few, large, flattened, oval, 6-8 cm. in diameter, exarillate.
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