Campylostemon Welw.

Glabrous lianes; older stems with a star-shaped cross-section. Latex present. Leaves opposite, petiolate. Stipules extra-petiolar, reduced, sharply acute. Inflorescences in axillary dichotomous cymes, sometimes grouped into panicles, many-flowered, glabrous, no accessory flowers or branches present; bracts opposite, persistent. Flowers pedicellate, (4–)5-merous; buds globose. Sepals small. Petals imbricate. Disc absent. Stamens 5, incurved; anthers with introrse, transverse dehiscence. Pollen in tetrads, tricolporate. Ovary 3-locular; ovules 4–16 per locule; stigma subsessile, trilobed. Fruit of 3 mericarps each with 2 caducous valves. Seeds winged, with a marginal and a submedian vein (the raphe), inserted into compressed pocket-like structures at the point of attachment. Germination epigeal.