Intricately branched perennial to 60 cm high, glabrous. Leaves semiterete to slender, clavate, acute, c. 10 mm long, fleshy. Flowers solitary, glabrous except woolly inside of perianth lobes. Stamens 4. Fruiting perianth persistent, very thick-walled, woody within, firmly spongy outside; attachment truncate, circular, 6–8 mm diam.; tube very shortly cylindrical, c. 3 mm high, 6–8 mm wide extending upwards as a thick-walled cup, c. 3 mm high from the corners of which arise four ascending spines, c. 10 mm long. Seed horizontal, thick; radicle erect.
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