Flora of North America species comparison

erect, short cylindric, to 20 × 4–6 cm;

ribs 13–19, crests slightly undulate;

areoles 4–8 mm apart.

13–17 per areole, stiff and straight, white, pink, or gray, becoming gray with dark tips;

radial spines 12–17 per areole, appressed to spreading, 2–12 mm;

central spines (0–)1–4 per areole, projecting, 1–4 mm.

5–8 × 7–10 cm;

flower tube 15–25 × 8–20 mm;

flower tube hairs 3–5 mm;

inner tepals purplish pink, darker proximal portion and midstripes, 35–45 × 10–22 mm, tips relatively thin and delicate;

anthers dark yellow;

nectar chamber to 3 mm.

dark green, brownish tinged, 15–23 mm, pulp white.