Tree, 20-40 m tall, the trunk conspicuously fluted or involute, to 20-80 cm diam; outer bark gray, relatively smooth, becoming weakly fissured in age; inner bark pale yellow, granular, the sap white, copious; stems and petioles, especially stems, densely mealy-granular-pubescent when young, soon glabrous; stems soon conspicuously lenticellate. Leaves alternate; petioles 6-15 mm long, weakly canaliculate; blades oblong-elliptic to narrowly elliptic, gradually acuminate at apex, acute to cuneate at base, (3.7) 6-14 cm long, 2.2-7.5 cm wide, green above, pale and weakly glaucous below (drying grayish), glabrous or inconspicuously pubescent along midrib, the margins weakly recurved. Panicles axillary, 2-3 cm long, pubescent; pedicels 2-3 mm long; flowers fragrant, ca 1 cm diam; calyx grayish-green, tubular, 4-5 mm long, the lobes rounded, 1-1.5 mm long, pubescent on outside; corolla pale yellow, lobed to about the middle, the tube slender, pubescent inside, the lobes oblong-elliptic, asymmetrical; stamens 5, inserted at throat of tube; ovary ca 1 mm long, glabrous; styles 2, glabrous, united, ca 1.5 mm long; stigma simple. Fruits brown, paired, reniform to suborbicular, flattened, 5.5-12 cm long, densely and obscurely lenticellate, densely mealy-pubescent, becoming glabrous in age; seeds several, tan, orbicular, papery thin, to 7 cm diam, the funicle slender, attached near center of seed, to ca 2.5 cm long. Garwood & Foster 443.