Annual succulent herbs. Leaves subglobose, fleshy. Flowers bisexual in triads in the axils of spirally arranged bracteal scales, connate to one another and adnate to bracts; perianth connate, compressed 4- edged, 3-dentate at apex; stamens 1(-2); stigmas 2. Seeds vertical; embryo hooked; radicle ascendent; perisperm abundant. Three spp., Mediterr. Europe, N and S Africa, W Asia.