Climbers with woody stems, often robust, evergreen; sap clear (in Victoria) or milky. Leaves opposite; petiole prominent. Flowers in terminal or axillary cymes or panicles, pedicellate; sepals fused at base, with minute basal glands inside; corolla usually cream, yellow or greenish, tube short, with a ring of reflexed hairs in throat, lobes spreading to revolute, imbricate or valvate in bud; stamens partially or fully exserted from corolla-tube, anthers narrowed at apex, fused in a cone around style head and mostly adhering to it, fertile in upper half only, expanded at base into 2 sterile lobes; nectary scales 5, free or fused; carpels fused, ovary usually superior, 2-celled, ovules many per cell, style head dilated, mostly capitate, with a circular membranous or thickened ring near base. Fruit a capsule, terete and pod-like or ovoid, separating on maturity into 2 follicle-like segments and a thin septum; seeds numerous, with a coma of long silky hairs.
About 130 species from South-east Asia to south-western Pacific; 36 species in Australia.