Rounded glabrous perennial to 60 cm high. Leaves slender, trigonous in T.S., 2–3 cm long. Flowers solitary. Perianth glabrous outside, woolly within. Stamens 5. Fruiting perianth glabrous outside; attachment broad and expanded, the base somewhat spreading around branch; tube cylindrical, narrowing towards apex, c. 5 mm high and wide at base; wall very thick, somewhat spongy on outside, woody within; limb conical, c. 2 mm high, erect or inflexed at tip; spines 2(rarely 4) + 1(2), slender, ascending; lateral pair 20–30 mm long; adaxial radicular pair with one 5–10 mm long, the other minute or up to 2 mm long (or the longer radicular spine absent), one or two long abaxial spines sometimes present or these represented by a small tubercle. Seed and radicle erect.
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