A genus of climbing, woody plants that have simple leaves, held in whorls or opposite. The sap is a milky latex. The regular, often showy and fragrant flowers are held in a cyme. The calyx is fused into a tube. The corolla is also a tube but has 5 lobes. The 5 stamens are also fused. The fruits are held in pairs. There are about 80 species, found in rain forests in South-east Asia, Australia, and New Zealand.
Subjects: Plant Sciences and Forestry.