Flowers: White inside and pink to purple outside. Flowers mostly summer and autumn.
Shrub to 3 m high if unsupported, or woody climber with vine-like stems to over 40 m long. Stems 'whip-like' or branched. Bark dotted with corky patches (lenticels). Leaves opposite, glossy, dark green, with 11–13 secondary veins on each side of the midrib.