Plants 5-35-branched, ultimately forming clumps, branching at or before sexual maturation. Stems mostly erect, ovoid to cylindric, 15-30(-50) × 3.5-7 cm; ribs (11-)12-18(-20), crests slightly undulate; areoles 8-20 mm apart. Spines (9-)12-17 per areole, straight in short-spined forms, sometimes curved or twisted in long-spined forms, appressed (radial spines) or porrect to spreading or descending (central spines when present), dull yellowish to brown or white to gray, often brown to black especially at bases or tips; radial spines (9-)11-16 per areole, 5-18 mm; central spines (0-)1(-3) per areole, 2-100 mm, white to yellow or brown, often becoming gray, all terete. Flowers 5-7 × 4-9 cm; flower tube 12-20 × 10-30 mm; flower tube hairs 1 mm; inner tepals deep magenta (to dark purple) with darker midstripes, proximally green (to very dark purple), 20-60 × 8.5-20 mm, tips relatively thin and delicate; anthers yellow; nectar chamber 2-4 mm. Fruits bright red or orange red, 15-25 mm, pulp white (or pale pink). 2n = 22.
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