Flora of North America species comparison

segments not disarticulating, blue- to yellow-green, sometimes tinged maroon-purple, flattened, spatulate to broadly obovate or subcircular, thick, 5–22(–35) × 2–13.5(–16) cm, nearly smooth, papillose to puberulent (rarely glabrous);

areoles 4–16(–19) per diagonal row across midstem segment, circular to elliptic, 3–5 × 3 mm;

wool white to tan, aging gray.

0(–8) per areole, when present, usually in distal areoles, spreading, yellow, straight, acicular, 5–25 mm.

usually 4–12 per areole, evenly distributed on stem segments, spreading, bright yellow to orange, red-brown at extreme base, aging tan to blackish, not chalky white, acicular;

major spines (1–)3–5(–6) per areole, sometimes flattened and/or curved, 20–60 mm;

smaller spines 1–7 per areole, slender, to 20 mm.

numerous, nearly filling areoles, yellow to red-brown or dark brown, to 3 mm.

well spaced in very narrow row encircling areole, subapical tuft not or poorly developed, yellow, unequal in length, to 5 mm.

inner tepals pink to magenta throughout (rarely white), 25–40 mm;

filaments red-magenta (rarely pale);

anthers yellowish;

style white to pink;

stigma lobes white to cream.

inner tepals yellow with orange to red bases, obovate, 30–40 mm;

filament yellow to pale green;

anthers pale yellow;

style yellow, sometimes basally pinkish;

stigma lobes green.

maturing tan, 20–40 × 15–23 mm, dry at maturity, puberulent, spineless (except in var. treleasei);

umbilicus 5–12 mm deep;

areoles 24–76.

green to reddish, turning tan, burlike, 30–40 × 20–25 mm, beginning fleshy, quickly drying, glabrous, bearing several rigid, yellow spines;

areoles 12–25.

yellowish to tan, ± subspheric but angular, thick, 6.5–9 × 6.5–7 mm, sides smooth or bearing 1–3 depressions;

girdle protruding to 1 mm.

tan, flattened, irregular in outline, 3–6 mm diam.;

girdle protruding to 1 mm.

= 22.