Stems usually unbranched, green, depressed-spheric or elliptic to shortly cylindric, ovoid when young, 2.9-8.5(-10.4) × 1.8-7.5(-8) cm, somewhat glaucous; ribs usually 13, obscure to well developed, tubercles evident on ribs. Spines not obscuring stems; radial spines (5-)6-7(-13) per areole, acicular, elliptic or rhombic in cross section; central spines (0-)1(-3) per areole, abaxial central spine, if present, hooked or curving somewhat downward, straw colored to brown, highlighted purplish or reddish, hooked, porrect, terete or somewhat angled, 3-31(-39) × 0.5-1 mm; lateral central spines 0-2 per areole, erect, similar to abaxial but not curved, angled to flat, somewhat inconspicuous, triangular in cross section, 15-35 ´ 1-1.5 mm; adaxial central spines not differentiated. Flowers campanulate, 2-3(-4) × 1.1-3(-3.5) cm; outer tepals greenish to purple with brownish midstripes, pink, purple or whitish at margins, oblanceolate, 7-16 × 2-6(-7) mm, mucronate, marginally membranous and crisped or minutely toothed; inner tepals purple, sometimes suffused with brown, largest tepals oblanceolate, 10-22(-30) × 4-7 mm, mucronate, somewhat irregularly toothed; filaments white, tinged with pink to pink-purple; anthers yellow. Fruits irregularly dehiscent, green to tan, sometimes suffused with pink, shortly cylindric, 7-15 × 5-12 mm, dry; scales few, membranous, scarious-margined. Seeds (1.2-)1.8-2.7 × (1.9-)2.5-3.8 mm; cells convex but flattened apically.
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