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.

5–8(–10) per areole, best developed in distal areoles, usually reflexed, spreading or some erect in marginal areoles, red-brown (often with darker annular rings) with yellow tips, aging blackish, straight or weakly curved, not or slightly flattened near bases;

central spines 1(–2), much longer and stouter, ± acicular, 10–40 mm.

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

crowded in crescent at adaxial edge of areole and subapical tuft, radiating and well developed in old stem segments, yellow, to 3 mm.

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 cream to lemon yellow, orangish abaxially on midvein areas, broadly spatulate-apiculate, 20–30 mm;

filaments cream-yellow;

anthers pale yellow;

style pale cream;

stigma lobes pale greenish yellow.

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.

red, subspheric, 15–28 × 12–23 mm, fleshy, glabrous, spineless;

umbilicus 4–5 mm deep;

areoles 24–36.

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

girdle protruding 1–2 mm.

tan, subcircular to reniform, flattened, warped, 3–4 × 2.7–3.5 mm, 2 mm thick;

girdle protruding 0.5–0.8 mm.

= 44, 66.

= 22, 44.