Original Description:The Cactaceae 3
p.30 - Britton & Rose (1920)
Plants small, 5 to 8 cm high, 2 to 3 cm in diameter; areoles closely set, round; radial spines 12 to 15, spreading, slender, brown-tipped; central spine one, porrect, 15 to 20 mm long, brown to blackish; flower 3.5 cm long, purple; areoles on the ovary bearing a cluster of brown spines and white wool.
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