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 not disarticulating, green to blue-green, flattened, elliptic to obovate, 6–15 × 5–12 cm, low tuberculate, papillate;

areoles 7–11 per diagonal row across midstem segment, subcircular to elliptic, 3–5 × 2–4 mm;

wool tan.

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.

absent or only l spine in 1–few distal areoles, deflexed, yellow to gray, straight, terete, to 10 mm.

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

in dense crescent at adaxial margin of areole and dense subapical tuft, yellow, to 6 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 throughout (magenta in introgressed plants), 25–30 mm;

filaments white to yellow;

anthers yellow;

style white;

stigma lobes green.

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

areoles 22–36.

tan to gray, 25–30 × 15–20 mm, dry, spineless;

areoles 12–18.

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

girdle protruding 0.5 mm.

tan, subspheric to irregularly shaped, flattened, very large, 9–12 mm diam.;

girdle thick, protruding 2.5–3.5 mm.

= 66.

= 66.