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 strongly interconnected, blue-green, flattened, obovate to ovate or circular, 15–25 × 10–20 cm, glaucous, low tuberculate, glabrous;

areoles 5–7 per diagonal row across midstem segment, often fan-shaped with small circular extensions at base, 2.5–5(–10) mm diam., base surrounded by glabrous yellow lip;

wool white, aging blackish.

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.

absent or vestigial, yellow.

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

few, scattered, poorly developed, yellow, aging gray to blackish, to 1.5 mm, covered by white, cottony wool.

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 brilliant yellow throughout, fading orange to red, 25–30 mm;

filaments white to green;

anthers yellow;

style white;

stigma lobes bright light green.

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

areoles 22–36.

pink- to red-purple with red pulp, pyriform, 30 × 25 mm, fleshy, glabrous, spineless;

areoles 18–25, usually crowded near apex, long, white woolly.

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

girdle protruding 0.5 mm.

tan, subcircular, 2 mm diam.;

girdle broad, projecting 0.5 mm.

= 66.

= 22.