Unarmed or spiny, annual, rarely perennial, monoecious herbs. Leaves alternate, long-petiolate, simple and entire or sinuate. Flowers unisexual. Bracts and 2 bracteoles present. Perianth segments (2-)3-5, free or connate at base, membranous. Fruit a capsule, indehiscent, rupturing irregularly or with a circumscissile lid. Seeds usually black and shining. Worldwide: 60 species, in both tropical and temperate zones Botswana: 10 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| cruentus L. | N | |
| dinteri Schinz | N,SW | |
| graecizans L. subsp. graecizans | Description | |
| hybridus L. [Agg] | N,SE | Description, Image |
| hybridus L. subsp. hybridus | SE | |
| praetermissus Brenan | N,SW,SE | Description |
| schinzianus Thell. | ||
| spinosus L. | N,SE | Description, Image |
| thunbergii Moq. | N,SW,SE | Description, Image |
| viridis L. |