Succulent glabrous rosetted perennial herbs usually with a prominent taproot; stems annual, erect or prostrate. Leaves opposite, triquetrous to subcylindrical, to 40 cm long; stem leaves becoming alternate, ensheathing the stem. Flowers solitary, terminal, long pedicellate; sepals 5, equal, acuminate, 3 with membranous margins; petaloid staminodes many, yellow, margins ciliate in lower half; stamens many; styles 8–25; ovary inferior to semi-superior, 8–25-locular; ovules numerous, parietal. Fruit a capsule, valves winged, opening when dry, dispersed by wind as tumble units; seeds numerous, subglobose to lenticular.
2 species native to South Africa, 1 naturalised in Australia.