Calyx small, subcoriaceous, eglandular; sepals almost free, imbricate, ovate, obtuse. Corolla funnel-shaped-campanulate; tube very short with 5 much projecting ridges extending from the sinuses towards the base and with 5 others alternating with them and slightly raised; lobes 5, oblong, obtuse, overlapping to the left. Stamens inserted near the base of the corolla-tube; filaments very short, flattened; anthers conniving in a cone, included, lanceolate, acute, sagittate; appendages much shorter than the polliniferous part; tails very short, subacute; foot of the connective broad, with a large papillose projecting cushion in the centre. Disc 0. Carpels 2, free. Style very short; stigma capitate, very minutely papillose except on the minute bifid apiculus; ovules 4 in each carpel, 2-seriate. Fruit unknown. Climbing shrubs. Leaves opposite or in whorls of 3, coriaceous, with faint and closely set parallel nerves; axillary stipules 0; axillary glands scanty, minute. Flowers small, in few- or many-flowered contracted cymes, gathered in terminal, often many-flowered, leafy panicles or corymbs.