Glabrous vines or climbing shrubs; stems woody, glabrous with conspicuous lenticels; sap copious, milky. Leaves short petiolate, coriaceous, lanceolate to nearly orbicular, basally rounded, apically short acuminate, dark shiny green above, paler beneath with conspicuous fine reticulate veins. Inflorescence sev-eral-flowered, cymose, terminal. Flowers with the calyx 5-lobed, cleft to the base, the lobes ovate to lanceolate, acute; corolla whitish, pink, or lavender, funnelform, the lobes greatly exceeding the tube, usually recurved when fully open; true corona absent, but with 5 corolline appendages on the tube, subulate, or bisected into filiform lobes, stamens short, mounted on the base of the corolla, anthers and filaments distinct, not joined into a single unit; pollen distinct as tetrads, not agglutinated into pollinia; pistils joined at base and apex, stigma large, globular. Fruit a single + boat-shaped follicle, woody with ribs or wings traversing the long axis; seeds numerous, small, comose.
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Woody lianes or scrambling subshrubs; latex white. Roots fibrous. Leaves petiolate, coriaceous, lacking colleters. Inflorescence of 1–4 fascicles. Corolla salverform; tube funnel-shaped; lobes free, imbricate. Annular corona absent; corolline corona of 5 filaments attached in corolla tube; gynostegial corona absent. Stamens free above. Anthers 4-locular with terminal appendage; pollen granular, aggregated in rectangular or T-shaped tetrads, loose on spoon-shaped, sticky translator. Style-head conical-pentagonal. Follicles fusiform-ovoid, woody. Seeds flattened, ovate, comose at micropylar end.
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