Stems unbranched or 2-3-branched, spheric, cylindric, or elongate-cylindric, 5-12(-16) × 4-8(-10) cm; ribs 12-15, well developed, tubercles sometimes evident on ribs . Spines 10-14(-17) per areole, dense, obscuring stems; radial spines white, straight, flat, 8-20 mm; central spines (1-)6-8 per areole; abaxial and lateral central spines (0-)3-5 per areole, red or reddish brown, usually hooked, 20-60 × 0.7 mm; adaxial central spines 1-2(-3) per areole, white, straight, (rarely hooked), flat, usually 25-45 × 1.5-2 mm. Flowers campanulate, 3-4 × 2-2.5 cm; outer tepals with greenish purple midstripes and rose-purple or magenta margins, cuneate-spatulate, usually 10-17 × 5-8 mm; inner tepals rose-purple to magenta, largest tepals ovate-lanceolate, 18-22 × 6-8 mm; filaments green to yellow; anthers cream to yellow. Fruits indehiscent or irregularly dehiscent, green to tan or pale red, barrel-shaped, 15-20 × 7-15 mm, dry at maturity. Seeds black, irregularly furrowed, 3-3.5 × 2 mm; testa with rounded papillae.
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