Original Description:The Cactaceae 3
p.218 - Britton & Rose (1920)
Small globose plants, 5 to 7 cm in diameter, entirely covered by the numerous interlocking spines; spines 12 to 14 in a cluster, gray to nearly white at least when old, slender acicular, curved backward, 1.5 to 2.5 cm long; central spine usually solitary, similar to the radials; cephalium small, made up of long soft wool and few bristles if any; flowers about 3 cm long 4 cm broad when fully expanded; inner perianth-segments numerous, white, acute; fruit a small naked red clavate berry, 2.5 cm long; seeds globular, tuberculate.
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