Rhizomatous herbs or undershrubs, young branches often twining. Leaves opposite, petiolate, lamina suborbicular to lanceolate. Flowers in axillary few-flowered cyrnes. Corolla lobes twisted in bud. Corona simple, 5-lobed or partite, lobes without internal processes, free or fused at the base only. Pollinia solitary in each loculus, pendulous, without a pellucid margin. Follicles smooth, fusiform.