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Calyx small, subcoriaceous or herbaceous; sepals almost free, obtuse or subacute, imbricate, with 1–2 basal glands within. Corolla salver-shaped; tube cylindric, slender, somewhat abruptly constricted at the middle or higher up (often close to the mouth) and slightly wider above the constriction, or with 5 or 10 small scale-like or subconfluent callous tubercles at the mouth. Stamens inserted at the constriction of the corolla-tube; anthers conniving in a cone, included or more or less exserted, subsessile, lanceolate, sagittate; appendages hard, stout; tails very acute; foot of the connective with an abruptly projecting ridge with stiff hairs on the flanks. Disc annular or cupular, entire or 5-lobed. Carpels 2, free, or connate at the base; style filiform; stigma oblong, clavate, densely papillose, with a minute 2-lobed glabrous apiculus, agglutinated to the foot of the connective; ovules numerous, 2–4-seriate. Mericarps follicular, linear, acuminate, slightly constricted between the seeds, more or less spreading. Seeds linear-lanceolate, not comose, more or less concave on the ventral face; endosperm scanty; cotyledons thin, flat or concavo-convex; radicle cylindric. Glabrous trees or shrubs. Leaves opposite, subcoriaceous or papery; axillary stipules 0 or very obscure and joined into a fine rim across the stem; axillary glands scanty and fugacious. Flowers on slender pedicels in few- to many-flowered subsessile umbelliform terminal and pseudolateral inflorescences.