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. Zambia: 8 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| abyssinicum Hochst. ex DC. | N,W,E | Description, Image |
| bakeri Scott Elliot | N,W | |
| dichotomum Vahl | N,E | Description, Image |
| fluminense Vell. | B,N,W,C,E,S | Description, Image |
| odoratissimum L. subsp. goetzeanum (Gilg) P.S.Green | N | |
| pauciflorum Benth. | N,W | |
| stenolobum Rolfe | N,C,E,S | Description, Image |
| streptopus E. Mey. | B,N,W,C,E,S | Description, Image |