Woody climbers, producing latex. Branches terete. Leaves opposite, those of a pair equal, petiolate; blade subcoriaceous. Inflorescence thyrsoid, terminal and axillary from upper axils; flowers 5-merous, actinomorphic. Sepal lobes free; with colleters only in the sinuses. Corolla consisting of a lower tube and slightly wider upper tube and then spreading lobes; lobes dextrorse, broad at base becoming narrower, falcate, infolded in bud; head of bud rounded; small corona lobes in throat alternating with the corolla lobes and often slightly notched at apex. Stamens included in the corolla tube, inserted at point where corolla widens, adnate at middle of anther to base of the apical part of the style head and again at base of anther to base of style head; filament short and narrow; anthers fertile in the upper half only, the lower half sterile, laterally with lignified guide rails and sagittate blunt appendages at the base. Disk of 5 free lobes. Gynoecium 2-carpellate, apocarpous but apically united into a common style, superior, ovoid, pubescent; style and style head short, head with a basal ring and no collar and a pointed apical part; ovules many. Fruit of 2 divergent follicles; broad at base, tapering to the end; with 2 ridges lengthways. Seeds flat, elliptic; with a long apical beak bearing a coma.
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