Flora of North America species comparison

erect, ovoid, becoming cylindric with age, 11–23(–40) × (4.5–)5.5–7(–10) cm;

ribs (13–)15–19(–21), crests rather sharply undulate;

areoles 5–11 mm apart.

erect to ascending, cylindric or somewhat tapering distally, 20–30(–70) × (4–)6–9 cm;

ribs 10–13, crests slightly undulate;

areoles 15–25 mm apart.

19–28 per areole, straight, appressed (radial spines) or spreading in all directions (central spines), presenting relatively bristly appearance (except when spines very short, and then having relatively smooth appearance as in E. pectinatus), pink to pale yellow, white, or tan, less often dark brown or purplish, annual growth increments marked (often vaguely) by rings of spines with contrasting colors;

radial spines (16–)17–25(–28) per areole, 5–15(–25) mm;

central spines (2–)8–12(–15) per areole, terete, largest spines 4.5–9.5(–14) mm.

13–16 per areole, usually straight, divergent-porrect, pale translucent yellow;

radial spines 8–12 per areole, 5–25 mm;

central spines 4–6(–8) per areole, 30–72 mm, abaxial central spine usually descending, paler than other central spines, often fading whitish, somewhat flattened.

7–8.5(–10) × 7–12 cm;

flower tube 10–20 × to 10 mm;

flower tube hairs 1–3 mm;

inner tepals either yellow (rarely orange-yellow, sometimes becoming salmon- or rose-pink with age), or rose-pink to magenta, proximal 5–30% green in either case, (25–)32–69(–77) × 8–23 mm, tips relatively thin and delicate;

anthers yellow;

nectar chamber 2–6 mm.

4–6 × 5–7 cm;

flower tube 18–25 × 12–30 mm;

flower tube hairs 1 mm;

inner tepals usually pale pink with midstripes slightly darker, proximal 1/3 greenish, 30–40 × 5–10 mm, tips relatively thin and delicate;

anthers yellow;

nectar chamber to 7 mm.

dark dull purplish to maroon (sometimes remaining green), 2–3.5 cm, pulp white to purplish pink.

green, becoming bronze where exposed to sun, 23–34 mm, pulp white.

= 44.

= 22.