Shrubs, often partly climbing or climbers. Leaves opposite, whorled or alternate, simple or compound. Domatia sometimes present in the axils of lateral nerves on the lower leaf surface. Inflorescences few-many flowered, cymose or solitary. Flowers scented. Calyx with cup-shaped tube and 5-15 teeth. Corolla white or yellow, salver-shaped with 5-13 lobes. Fruit a deeply 2-lobed, 2-seeded berry. Derivation of name: from ysmyn, the Arabic name for the genus. Worldwide: 200 species, mainly tropical, with a few temperate. DRC: 1 taxon. Insects associated with this genus:
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| Species | Botanical divisions | Content |
| dichotomum Vahl | Description, Image |