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.

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.

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

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

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

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

filaments white to yellow;

anthers yellow;

style white;

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.

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

areoles 12–18.

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

girdle thick, protruding 2.5–3.5 mm.

= 66.