Stems usually unbranched, light green to dark green, ovoid or cylindric, 2-15(-23) × 1-10(-15) cm, glaucous; ribs (11-)13-14, tubercles prominent on ribs. Spines frequently obscuring stems; radial spines 6-10(-12) per areole, spreading, tipped white or dark, 10-35 × 0.3-1 mm; central spines (2-)4-6 per areole; abaxial centrals (1-)3 per areole, reddish to black, less often tan to brown, usually 1-2 hooked, except some older areoles, 20-40 mm; lateral central spines usually 2 per areole, tan, red, or reddish brown, terete, 10-30 mm; adaxial central spines 1(-3) white, flattened, 20-60 × 0.7-1.6 mm. Flowers narrowly funnelform to campanulate, 2-5 × 1-4 cm; outer tepals with greenish brown or reddish brown midstripes and pink, violet-pink, or reddish purple margins, usually oblanceolate, 10-20 × 4-7 mm, usually mucronate, margins nearly entire; inner tepals reddish purple to lavender, oblanceolate to narrowly oblanceolate, 15-25 × 6-8 mm, margins paler, nearly entire; filaments yellow, green, red-violet, or pink; anthers yellow; styles minutely and sparsely papillate. Fruits dehiscent along 2-4 vertical slits, green to pink or pale red, barrel-shaped, 9-13 × 8-12 mm, dry; scales few, membranous, scarious-margined. Seeds black, 2-2.5 × 2.5-3 mm; testa with rounded papillae.
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