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 easily detached to firmly attached, green, flattened, narrowly to broadly obovate, 3.5–9 × 2.5–5 cm, low tuberculate, glabrous;

areoles 4–6(–7) per diagonal row across midstem segment, oval, 3.5 × 2.5 mm;

wool white.

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

in most areoles, straight, acicular, terete;

major spines 0–1 per areole, reflexed to porrect (rarely ascending), gray-white to brown, (15–)25–40(–60) mm; intermediate spines 0–3, reflexed, 12–20 mm;

minor spines 2–4, reflexed, yellow-gray, 3–6 mm.

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

loosely packed, in small tuft or crescent at adaxial margin of areole, yellowish, inconspicuous, to 4 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, 30–45 mm;

filaments white to red;

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.

rarely set, top-shaped to barrel-shaped, 15–20 × 15 mm, glabrous;

areoles 10–15, most bearing 3–12 spines or distal spines bearing 1–3 spines.

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, large, 5–7 mm;

girdle protruding 1–1.5 mm.

= 66.