A genus of climbing, twining, or erect shrubs, herbs, and some trees, whose leaves are reduced or absent, and whose stems are fleshy. The flowers are bisexual, and usually borne in cymes. The calyx is a fused tube of 5 segments. The petals are partially fused along their margins and sometimes folded. The 5 stamens are attached to the base of the corolla-tube. There are 10 species, found in tropical and subtropical parts of the Old World, where they are components of xerophytic communities.
Subjects: Plant Sciences and Forestry.