Annual or perennial herbs, shrublets or shrubs. Stipules lateral. Leaves alternate, simple (in ours), petiolate. Sepals 5, usually linear and with a short horn just behind the apex, stellately hairy. Petals 5, yellow or orange. Stamens 4-40. Ovary 2-5-locular. Fruit a capsule, usually spherical (rarely ovoid), echinate or setose. Note: mature fruits are essential in naming these species. The measurements of fruit diameters include the aculei. Worldwide: 70 species in the tropics Caprivi: 2 taxa. Insects associated with this genus:
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| Species | Content | |
| angolensis Sprague & Hutch. | Description | |
| annua L. | Description, Image |