Flora of North America species comparison

segments not disarticulating, green, flattened, elliptic to obovate to rhombic, 15–25(–40) × 6.5–14 cm, ± tuberculate, glabrous, usually glaucous;

areoles 5–7(–8) per diagonal row across midstem segment, prominent, subcircular(-oval), 4–6 × 4–5 mm, enlarging in age;

wool gray.

segments easily detached when terminal, dark green, subspheric to subcylindric, to flattened and elliptic obovate, (1.5–)2–5.5 × (1–)1.5–3 cm, low tuberculate (pronounced when dried), glabrous;

areoles 3–5 per diagonal row across midstem segment, oval, 3 × 2.5 mm;

wool white.

4–11 per areole, in most areoles, yellow with chalky white coat, to yellow with red-brown basal portions, aging reddish gray;

erect ones terete, stout, straight;

abaxial ones reflexed, shorter, to 12 mm;

adaxial spines spreading, longest spines 20–40 mm.

3–8 per areole, in most areoles spreading, gray with brown tips, straight, ± acicular, terete, the longest 8–24 mm; depressed spines at base of areoles 0–3, 1–3 mm.

moderately dense in crescent at adaxial edge of areole, merging with subapical tuft when present, yellow to red-brown, to 5 mm.

in crescent at adaxial margin of areole, tan to brown, inconspicuous, to 3 mm.

inner tepals yellow to dull red throughout, 35–45 mm;

filaments yellow to orange-yellow;

anthers yellow;

style pink to red;

stigma lobes yellow-green to green.

inner tepals yellow, sometimes basally red, 20–26 mm;

filaments white or red;

anthers yellow;

style white;

stigma lobes green.

dark red-purple throughout, obovoid, 35–50 × 30–35 mm, juicy, glabrous, spineless;

areoles 22–36.

tan, 10–30 × 8–15 mm, dry, glabrous;

areoles 12–22, distal areoles bearing 1–6 short spines.

gray, subcircular, warped, 3–4.5 mm diam.;

girdle protruding 0.5 mm.

tan to gray, flattened, warped, oblong to subcircular, 5–6 mm diam.;

girdle protruding 1–1.5 mm.

= 66.

= 66.