Original Description:The Cactaceae 4
p.55 - Britton & Rose (1920)
Plants often solitary, perhaps also cespitose, globose to short cylindric, very spiny; tubercles short, usually hidden by the spines; radial spines numerous, spreading; central spines several, longer than radials, usually brown or black in upper part; flowers small, 1 to 1.5 cm long, purple; outer perianth-segments broad, often rounded at apex with ciliate margins; inner perianth-segments pointed.
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