Craterosiphon Engl. & Gilg

Lianes, climbing shrubs or small trees with twining branches; twigs with conspicuous lenticels, glabrous. Leaves opposite, subopposite or rarely alternate, petiolate; blade elliptic to ovate, acuminate, lateral nerves spreading almost at right angles. Inflorescences axillary. Flowers 5-merous, subsessile or shortly pedicellate, solitary or 2–4, with small, sometimes ciliate, bracts. Calyx tube funnel-shaped, glabrous outside, somewhat fleshy, not articulated, persistent; lobes 5, equal to the tube or much shorter. Petals absent or 10 minute glands inserted at the throat of the tube. Fruit a drupe with a persistent calyx tube. Seeds oblong, fusiform.

Worldwide: About 9 species, all in tropical Africa.

DRC: 6 taxa.