Annual or perennial herbs, often scabrid and turning black on drying. Leaves alternate or opposite, simple. Inflorescence spicate or with flowers in ± spherical clusters or flowers solitary and axillary. Calyx tubular, 10-ribbed, 4-5-lobed. Corolla with cylindric tube and 5 ± equal lobes. Stamens 4; anthers strictly 1-thecous. Fruit a capsule, without a beak. Worldwide: c. 100 species in the tropics and subtropics Burundi: 11 taxa. |
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| Species | Content | |
| affinis De Wild. | ||
| capitata Benth. | ||
| cryptocephala (Baker) Philcox [Agg] | ||
| hispida Buch.-Ham. ex D. Don | Description, Image | |
| keilii Mildbr. | ||
| lastii Engl. [Agg] | ||
| leptostachya Benth. | ||
| libenii Mielcarek | ||
| nuttii Skan | Description | |
| quadrifaria Baker | Description, Image | |
| usuiensis Oliv. |