Shrubs or trees, with branches often in threes and young parts often glutinous. Stipules sheathing, often truncate. Leaves opposite or 3-nate, with or without domatia. Flowers large, terminal or pseudoaxillary, solitary or in few-flowered fascicles, white, turning yellow to brown with age. Corolla tube funnel-shaped or cylindric; lobes 5-12. Ovary 1-locular with 2-9 parietal placentas. Fruit spherical or ellipsoid, usually with a thick fibrous or woody wall. Seeds numerous, fused into a pulpy solid mass. Derivation of name: Named after Alexander Garden, a medical doctor from Aberdeen, who was one of Linnaeus' correspondents Worldwide: c. 60 species in the tropical and warm Old World Caprivi: 4 taxa. Insects associated with this genus:
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| Species | Content | |
| brachythamnus (K. Schum.) Launert | Description, Image | |
| resiniflua Hiern subsp. resiniflua | Description, Image | |
| volkensii K. Schum. subsp. spatulifolia (Stapf & Hutch.) Verdc. | Image | |
| volkensii K. Schum. subsp. volkensii var. volkensii | Description, Image |