Rounded annual or perennial to 1 m high, intricately and divaricately branched, glabrous to villous or woolly. Leaves flat, linear to narrowly oblong or elliptic, mostly 5–15 mm long. Flowers solitary, glabrous to villous or minutely woolly. Stamens 4. Fruiting perianth hard, glabrous to villous or minutely woolly; base truncate, very oblique, circular; tube very shortly cylindrical, c. 2 mm high and wide, steeply ascending, rounded at apex, spines 3+2 or 3+1, two lateral, one abaxial, and a short adaxial radicular pair (or sometimes only one of the pair developed), the abaxial and lateral spines 5–10 mm long, the radicular spines 1–2 mm long. Seed oblique to horizontal.
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