Flora of North America species comparison

segments not disarticulating, blue-green, flattened, obovate to circular, 13–21 × 11.5–19 cm, nearly smooth, glabrous;

areoles 7–10 per diagonal row across midstem segment, subcircular to elliptic, with basal ridge, 3–6 × 2.5–4 mm;

wool tan, aging grayish white.

0–1(–2) per areole, usually few along margins of stem segments, deflexed to erect, pale yellow to horn colored (aging reddish brown), straight to slightly curved, acicular, terete, the longest to 40 mm, usually shorter.

absent or usually in distal areoles to evenly distributed over entire stem segment, yellow, aging red-brown to blackish, straight or weakly curved, ± acicular, deflexed, or some erect in marginal areoles;

larger spines 0–7 per areole, terete or basally flattened, 25–45 mm, usually accompanied by few straight to wavy bristle-spines.

dense in crescent at adaxial edge of areole, nearly encircling areoles, and in subapical tuft, of even height, yellow to tan, aging brown, to 5 mm.

crowded in narrow crescent along adaxial margins, longer toward base of areole margins, subapical tuft absent or poorly developed, yellow, aging reddish brown, to 14 mm.

inner tepals yellow throughout, fading orangish, 25–45 mm;

filaments pale yellow throughout or pale yellow proximally, white distally;

anthers pale yellow;

style white;

stigma lobes light green.

inner tepals yellow (sometimes with reddish blush near base), abaxially reddish streaked along midveins, broadly spatulate-apiculate, 18–30 mm;

filaments white to yellow;

anthers;

style and stigma lobes white, yellowish, or pale green.

purplish, green inside, obovoid to barrel-shaped, 25–45 × 20–30 mm, fleshy, glabrous, spineless;

areoles 34–44(–54).

red, barrel-shaped, 30–60 × 18–40 mm, fleshy (often mummifying), glabrous, spineless;

umbilicus 6–9 mm deep;

areoles 40–68.

tan, 3.5–5 × 3–4 mm, sides convex, often bearing bumps;

girdle protruding 0.5 mm.

yellowish, 3.5–4 × 3–3.5 mm, 1.5–1.8 mm thick, reniform to subcircular, flattened, often warped;

girdle protruding 0.1–0.5 mm.

= 22.

= 22.