Original Description:The Cactaceae 4
p.97 - Britton & Rose (1920)
Plants usually solitary, nearly globular, often 10 cm in diameter, pale green, densely covered with spines; axils of tubercles containing white bristles, the flowering and fruiting ones filled with dense white wool; radial spines about 16, slightly spreading, white except the dark tips; central spines 4, longer and stouter than the radials, porrect, reddish brown; flowers rather small, about 12 mm long, purplish; inner perianth-segments oblong, entire; filaments pale; stigma-lobes green; fruit scarlet, 12 to 16 mm long; seeds brownish.
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