Climbers or scramblers; producing white latex. Branches lenticellate or not. Leaves opposite; those of a pair equal in size; petiolate; blade papery, entire; secondary veins few, strongly ascending; hair-filled domatia in the axils of the secondary veins with the midrib. Inflorescence a terminal and/or axillary cyme, lax. Flowers 5-merous, actinomorphic, small. Sepals free, colleters in a row at the base inside. Corolla: lobes dextrorse; mature corolla urceolate to salverform, consisting of a tube and somewhat spreading lobes; lobes narrow, strap-shaped, strongly bent to the right as viewed from inside. Stamens completely included within the corolla tube, attached at the insertion of the filament into the anthers in a ring to the style head; anthers with a short filament, fertile in the upper half only, the lower half sterile, laterally with lignified guide rails and sagittate appendages at the base. Disk 5-dentate or 5-crenate, usually slightly shorter than ovary. Gynoecium 2-carpellate, apocarpous but apically united into a common style, superior, ovoid, pubescent. Fruit of 2 parallel or slightly divergent follicles; narrow and torulose; longitudinally dehiscent. Seeds linear; glabrous; unbeaked apex bearing a cream-coloured coma.
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