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 easily detached, green, flattened, obovate to circular, 10–15 × 7.5–12 cm, nearly smooth, glabrous;

areoles 5–7 per diagonal row across midstem segment, ovate or oblong to obovate, 3–5 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.

4–7 per areole, mostly in distal areoles, black to red-brown with conspicuous brown to yellow tips, fading gray;

longer spines ascending, usually straight, acicular, terete, 25–35 mm; 1–2 smaller spines deflexed, chalky white, to 10 mm; 0–4 additional very small spines.

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

in bushy crescent at adaxial edge of areole and dense subapical tuft, yellow to brown, aging blackish, of unequal lengths, to 5 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, quickly fading to apricot, 25–30 mm;

filaments and anthers yellow;

style whitish;

stigma lobes greenish yellow to yellow.

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

areoles 22–36.

red-purple, green-yellow interior, spheric-obovoid to pyriform, 15–20 × 12 mm, fleshy, glabrous, spineless;

areoles 20–25.

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

girdle protruding 0.5 mm.

tan to gray, subcircular, 3–4 mm diam;

girdle narrowly protruding.

= 66.

= 22.