Glabrous perennial herbs (in ours), with annual stems arising from a perennial often tuberous base. Stipules 0. Leaves alternate or rarely sub-opposite or in a rosette. Flowers in terminal or axillary cymes, racemes or panicles or solitary. Sepals 2, opposite. Petals 5 (in ours). Stamens 5-many. Ovary superior, 1-locular; style filiform with 3 stigma lobes. Capsule dehiscing longitudinally by 3 valves. Worldwide: 39-40 species in southern Africa, C and S America Botswana: 5 taxa. Insects associated with this genus:
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| Species | FZ divisions | Content |
| arnotii Hook. f. | N | Description, Image |
| caffrum (Thunb.) Eckl. & Zeyh. | SE | Description, Image |
| crispatulum Dinter ex Poelln. | SE | |
| portulacifolium (Forssk.) Asch. ex Schweinf. | N | Description, Image |
| tenuissimum Dinter | N,SW | Description, Image |