Original Description:The Cactaceae 3
p.220 - Britton & Rose (1920)
Small, about 6 cm in diameter, somewhat flattened; ribs about 10, but nearly hidden under the mass of spines; cephalium prominent, made up of a mass of white wool, almost devoid of bristles; spines 7 to 9, slightly flattened, stout, somewhat curved backward, rose-colored, 1.5 to 3 cm long; flowers 4 to 5 cm long with a slender tube perianth-segments oblong, white, tinged with yellow; fruit a small naked berry; seeds globular, tuberculate.
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