Tree up to 30 m., the sap red. Leaves up! to 27 cm. long, the leaflets 9-13, alternate, oblong, the apical oblanceolate or obovate, the basal lanceolate or ovate, 5-13 cm. long, 2-4.5 cm. wide, acuminate, the main veins about 14. Panicles terminal, the rachis slender, up to 5 cm. long, tomentose. Flowers with the hypan-thium tubular-camp;anulate, about 7.5 mm. long, carnose, densely pilulose within, the 3 lower teeth deltoid, about 2 mm. long, acute, the upper 2 united along most of their length, a little longer than the lower; vexillum suborbicular, about 9 mm. long; wing petals suborbicular, up to 8 mm. long, tapering more sharply along the upper margin; carinal petals gibbous, obovate-falcate, about 5 mm. long; stamens monadelphous, the sheath open above, up to 3.5 mm. long, the linear-subulate filaments up to 2.5 mm. long, the carinal filament free almost to the base of the sheath, the anthers about 0.5 mm. long, versatile; ovary apparently sessile, terete or more compressed above the middle, ferruginous-villose, the hairs more dense above the middle on the carinal side, 4-to 5-ovulate, the style about 3.5 mm. long, thickly subulate, glabrous. Fruits sessile, glabrous, the seminiferous area often plump, obliquely subrotund, occupying about one third of the length of the fruit, thickened, woody, strongly veined, lustrous, the wing cultriform, about 7.5 cm. long, up to 4.5 cm. wide, rounded, very thin, flat, the upper margin scarcely curved, the lower curved; seeds 4-5, separated by obvious septa, flat, lanceolate-oblong, about 2 cm. long, about 0.5 cm. wide, oblique and beaked.
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