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 Burundi: 15 taxa. Insects associated with this genus:
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| Species | Content | |
| angolensis Sprague & Hutch. | Description | |
| brachyceras K.Schum. | ||
| cordifolia A.Rich. | Description, Image | |
| cordifolia A.Rich. var. pubescens R.Wilczek | ||
| cordifolia A.Rich. var. tomentosa Sprague | ||
| dekindtiana Engl. | Description, Image | |
| digitata (Oliv.) Sprague & Hutch. | Description, Image | |
| pentandra A. Rich. | Description, Image | |
| pilosa Roth [Agg] | Description, Image | |
| rhomboidea Jacq. | Description, Image | |
| setulosa Mast. | ||
| tomentosa Bojer | Description, Image | |
| trichocarpa Hochst. ex A. Rich. | ||
| welwitschii Mast. [Agg] | Description, Image | |
| welwitschii Mast. var. welwitschii |