Large trees, unarmed, terrestrial, without raphides in the tissues. Leaves opposite, petiolate, entire, with the higher-order venation not lineolate, with pubescent domatia; stipules fused around stem or tardily splitting and interpetiolar, triangular, erect and perhaps imbricated in bud, persistent. Inflorescences terminal and sometimes also in uppermost axils (or inflorescence with follaceous bracts), cymose, several-flowered, pedunculate, bracteate with bracts usually stipuliform. Flowers pedicellate, bisexual, homostylous, protandrous, large, perhaps fragrant and nocturnal; hypanthium ellipsoid and flattened; calyx limb developed, 6-lobed, without calycophylls; corolla slenderly tubular and elongated (10-11 cm), white perhaps becoming pink with age, densely pilosulous inside, lobes 6, linear-ligulate, thinly imbricated (quincuncial) in bud, strongly recurved at anthesis, without appendages; stamens 6, inserted near base of corolla tube, filaments thickened and coherent at base, anthers linear and well developed (3 cm), basifixed, dehiscent by linear slits, exserted, sagittate at base and with apiculate appendage at top; ovary 2-locular, with ovules numerous in each locule, on axile placentas, stigma shortly biblobed, exserted. Fruit capsular, ellipsoid and strongly laterally flattened at 90° to the septum, septicidally dehiscent from apex with valves separating, woody, smooth except lenticellate, with calyx limb deciduous; seeds numerous per locule, flattened, medium-sized (15 x 7 mm), ellipsoid, flattened, marginally with concentric wing, wing entire, papery.