Shrubs and small trees, unarmed, terrestrial, without raphides in the tissues, sometimes with short-shoots, sometimes with corky bark, sometimes resinous at apex. Leaves opposite, petiolate, entire, with the higher-order venation not lineolate, sometimes with pubescent or crypt-type domatia; stipules interpetiolar, triangular, acute, erect and perhaps imbricated in bud, persistent and often becoming indurated. Inflorescences axillary at several nodes below stem apex, flowers solitary and spreading to pendulous, pedunculate, peduncle sometimes articulated, ebracteate or irregularly bracteate. Flowers pedunculate, bisexual, protandrous, perhaps homostylous, medium-sized, fragrant, apparently nocturnal; hypanthium obconic; calyx limb developed, deeply 6- or 8-lobed, without calycophylls; corolla in bud inflated, plicate, and yellow to pale green, at anthesis broadly funnelform and white sometimes flushed with pink, medium-sized (3-12 cm), glabrous inside, lobes 6 or 8, triangular, rather short, in bud thinly imbricated (quincuncial), spreading at anthesis, without appendage; stamens 6 or 8, inserted at base of corolla tube, filaments shorty connate at base, anthers narrowly oblong, basifixed, dehiscent by linear slits, included to shortly exserted, sagittate at base, without appendage at top; ovary 2-locular, with ovules numerous in each locule, on axile placentas, stigma 1, cylindrical, sometimes bilobed, partially exserted. Fruit capsular, ellipsoid to subglobose, laterally weakly flattened, septicidally dehiscent from apex then shortly loculicidal, with valves eventually fully separating, rather small (1.5-3.5 cm long), woody, smooth or ridged, sometimes lenticellate, with calyx limb deciduous; seeds numerous per locule, discoid to elliptic, flattened, medium-sized (4-8 mm), marginally with concentric wing, entire, densely reticulate.