Flora of North America species comparison

segments not easily detached, pale green to deep green, graying with age, wrinkled when stressed, flattened, broadly obovate to ovate, 6.5–15 × 4–10 cm, tuberculate, glossy, glabrous;

areoles 6–9 per diagonal row across midstem segment, oval, obovate, or subcircular, 2.5–5 × 1.5–4 mm;

wool tan, aging brown.

1–9 on most areoles to only on distal 1/2 of stem segment, white to gray with pale brown tips and bases, sometimes brown throughout;

central spines 1–3, all deflexed or 1–2 porrect or ascending, terete or flattened, occasionally spirally twisted, 25–70 mm; small spines (2–)3–6(–8) strongly deflexed, usually slender, even bristlelike, 5–15 mm.

(0–)1–2(–4) per areole, in distal 3/4 of stem segment areoles (to nearly spineless), porrect to spreading, red-brown, aging gray, stout, straight, terete, to 30 mm, strongly barbed.

forming a well developed adaxial tuft, yellow to brownish white, to 6 mm.

in crescent at adaxial edge of areole, pale yellow, aging brown, to 3 mm, longest at areole apex.

inner tepals yellow to gold, commonly darker to red near base, broadly spatulate, 30–40 mm, apiculate;

filaments usually pale yellow;

anthers yellow;

style whitish to pale green;

stigma lobes greenish.

inner tepals yellow throughout, 20–30 mm;

filaments and anthers yellow;

style and stigma lobes white.

purple-red, oval to broadly ovate, subspheric or short ovoid, bases not narrowed, 30 × 20–25 mm, fleshy, base not narrowed, glabrous, spineless or nearly so;

umbilicus deep;

areoles 18–30.

green becoming red-purple at late maturity, barrel-shaped, 18–30 × 12–20 mm, fleshy, glabrous, spineless;

areoles 8–16.

whitish to tan, irregularly shaped, flattened, 4–6 × 3–4 mm;

girdle protruding 1–2 mm.

tan, subcircular, flattened, 4–6 mm diam.;

girdle slightly protruding.

= 44, 66.

= 44.