Erect perennial herbs branching from base, usually glabrous except axillary pubescence. Leaves alternate, succulent, subterete to clavate. Flowers bisexual, solitary, axillary, glabrous except ciliate margin to lobes. Perianth tube somewhat fleshy; upper perianth membranous, 5-lobed. Stamens 5. Fruiting perianth glabrous; tube woody, subglobular, straw-coloured when dry; limb hidden in sunken apex of tube; radicular tubercle prominent, either bare or bearing an erect wing; intertepaline tubercles 0–4, or replaced by vertical wings; style short and hard, pubescent at apex. Seed horizontal with horizontal to ascending or erect radicle.
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