Woody climbers, producing white latex. Branches terete, lenticellate or not; branchlets terete, puberulent to glabrous. Leaves opposite, those of a pair equal, petiolate; bases of petioles usually joined in an inconspicuous ring around the branch, with colleters in a ring on younger nodes. Blade papery to coriaceous, entire, midrib impressed above and prominent beneath; secondary veins anastomosing before margin, tertiary venation scalariform and/or reticulate. Inflorescence of axillary and terminal cymes, often forming into a terminal panicle, glabrous or puberulent, lax; bracts small and ovate; flowers 5-merous, actinomorphic, often fragrant. Sepals free, entire, often with a thick base, with a row of colleters at the base inside. Corolla salverform; tube slightly wider near the base where the anthers are located and widening again slightly just before the top; lobes dextrorse, falcate in mature flower. Stamens seemingly free but actually very loosely adnate to style head, inserted near base of corolla tube; filaments filiform; anthers introrse, oblong, base shortly sagittate, apex mucronate, fertile most of length except at very base and apex. Disk of 2 separate ovate or oblong lobes alternating with the carpels. Gynoecium 2-carpellate, apocarpous but apically united into a common style, glabrous, ovules many, style head fusiform with a sterile pointed apex. Fruit of paired follicles, fusiform to terete, pointed at ends, somewhat laterally flattened, longitudinally dehiscent, many-seeded. Seeds elliptic with a coma pointing towards fruit apex, grain slightly elongated at end with coma.
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