Flora of North America species comparison

segments not disarticulating, green, flattened, elliptic to obovate to rhombic, 15–25(–40) × 6.5–14 cm, ± tuberculate, glabrous, usually glaucous;

areoles 5–7(–8) per diagonal row across midstem segment, prominent, subcircular(-oval), 4–6 × 4–5 mm, enlarging in age;

wool gray.

segments not disarticulating, green to dark green, sometimes reddish under stress, flattened, obovate to circular, 10–25 × 7–20 cm, low tuberculate, glabrous;

areoles 5–7 per diagonal row across midstem segment, obovate to elliptic, 3–6 × 2–4 mm;

wool tan to brown, aging grayish.

4–11 per areole, in most areoles, yellow with chalky white coat, to yellow with red-brown basal portions, aging reddish gray;

erect ones terete, stout, straight;

abaxial ones reflexed, shorter, to 12 mm;

adaxial spines spreading, longest spines 20–40 mm.

(0–)2–8 per areole, at most areoles to only distal 1/4 of stem segment, or essentially absent, brown to white, straight, curved, or spirally twisted;

major central spines deflexed or spreading, brown to red-brown (to blackish), or partly to wholly gray to tan, subulate, usually flattened near base, 30–80 mm;

abaxial spines usually 1–3, deflexed, white, flattened, shorter, to 20 mm.

moderately dense in crescent at adaxial edge of areole, merging with subapical tuft when present, yellow to red-brown, to 5 mm.

dense in crescent at adaxial edge of areole and subapical tuft, tan to red-brown, to 5 mm.

inner tepals yellow to dull red throughout, 35–45 mm;

filaments yellow to orange-yellow;

anthers yellow;

style pink to red;

stigma lobes yellow-green to green.

inner tepals yellow with red basal portions (rarely entirely pink to red), 30–40 mm;

filaments greenish basally, pale yellow to white distally;

anthers yellow;

style white;

stigma lobes green to yellow-green.

dark red-purple throughout, obovoid, 35–50 × 30–35 mm, juicy, glabrous, spineless;

areoles 22–36.

wine red to purple, with greenish flesh (sometimes reddish and ± juicy), not long stipitate, obovate to barrel-shaped, 30–50 × 20–30 mm, fleshy, glabrous, spineless;

areoles 18–24.

gray, subcircular, warped, 3–4.5 mm diam.;

girdle protruding 0.5 mm.

tan, subcircular, 4–5 mm diam., evidently notched, warped;

girdle protruding 1 mm.

= 66.

= 66.