Shrubs or small trees, with white latex and with simple or forked spines. Branches repeatedly dichotomously branched. Stipules 0. Leaves opposite. Flowers in terminal corymbs or 1-5-flowered cymes. Calyx lobes imbricate, free to base. Corolla salver-shaped; tube cylindric; lobes contorted, overlapping either to left or right. Stamens inserted at middle or towards top of corolla tube; anthers subsessile, glabrous. Ovary with 2 carpels, with 1-4 or rarely many ovules per loculus. Fruit an ellipsoid or ovoid berry. Seeds discoid or flattened-ellipsoid, velutinous. Worldwide: 37 species in the warm Old World, eastwards to Australia and New Caledonia DRC: 2 taxa. Insects associated with this genus:
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| Species | Botanical divisions | Content |
| macrocarpa (Eckl.) A. DC. | Description, Image | |
| spinarum L. | I,VI,VII,VIII,IX,XI | Description, Image |