Annual herbs. Leaves alternate, subcylindrical. Flowers solitary, clustered at apex of the branches; subtended by 2 indurating bracteoles; perianth lobes 5, free almost to base, in fruit the 2 outer usually producing a wing-like outgrowth below the middle; stamens 5, with bladdery-saccate appendages; staminodes absent; stigmas 2, i subulate. Seeds vertical. Three spp., W and C Asia.