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. Zimbabwe: 14 cultivated taxa. Insects associated with this genus:
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| Species | Content |
| azoricum L. | |
| beesianum Forrest & Diels | |
| fluminense Vell. | Description, Image |
| fruticans L. | Description |
| grandiflorum L. | |
| humile L. | |
| laurifolium Roxb. ex Hornem. var. laurifolium | |
| mesnyi Hance | Description, Image |
| multiflorum (Burm. f.) Andrews | |
| multipartitum Hochst. | Description, Image |
| nudiflorum Lindl. | |
| officinale L. | |
| polyanthum Franch. | Image |
| sambac (L.) Aiton |