Climbers or scramblers. Branches lenticellate, becoming corky. Leaves opposite; those of a pair equal in size; petiolate, with a ring of glands in the axils and between petiole bases; blade coriaceous, entire, secondary veins ascending towards margins, tertiary venation conspicuous and reticulate, glabrous. Inflorescence an axillary elongated cyme, brown puberulent, lax; flowers 5-merous, actinomorphic, small. Sepals free, colleters fused together on the inside at the base. Corolla lobes weakly dextrorse; mature corolla urceolate, consisting of an inflated tube, thickened throat and small lobes; lobes triangular; pubescent outside, glabrous inside. Stamens included within the corolla tube, attached in a ring to the style head; filaments attached near corolla throat, curving downwards and then up again; anthers fertile in the upper half only, the lower half sterile, laterally with lignified guide rails and outward curving sagittate appendages at the base. Disk of 5 lobes, fused at base. Gynoecium of 2 connate carpels, superior, flat-topped, pubescent; ovules many; style columnar. Fruit unknown.
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