Lianas or scandent shrubs, unarmed. Raphides absent. Leaves opposite, sometimes with domatia; stipules caducous, interpetiolar, triangular. Inflorescences axillary [to terminal], 1-flowered [or cymose and several to many flowered], pedunculate, bracteate. Flowers sessile, pedunculate, or pedicellate, bisexual, monomorphic. Calyx limb 5-lobed. Corolla pale yellow or white becoming yellowed with age, salverform, variously glabrous or pubescent inside; lobes 5, convolute to right in bud. Stamens 5, inserted in corolla throat, exserted; filaments short; anthers basifixed. Ovary 2-celled, ovules numerous in each cell on axile placentas; stigma fusiform, exserted. Fruit capsular, subglobose, loculicidally dehiscent with valves sometimes secondarily separating along septum, woody, with calyx limb persistent; seeds several, medium-sized to large, flattened, suborbicular, bordered by a regularly erose wing; endosperm fleshy; embryo straight; cotyledons short; radicle terete, basiscopic.
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