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 easily detached, green, often purple near areoles, flattened, obovate to ovate, 10–25 × 7.5–11 cm, ± tuberculate, glabrous, glaucous;

areoles 4–5 per diagonal row across midstem segment, subcircular to oblong, 5–6 mm diam.;

wool tan, 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.

1–5(–8) per areole, at most areoles, spreading, white with red base, becoming dark red-brown with pale tips, aging gray, stout, usually curved, elliptic in cross section, longest to 70 mm.

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

closely spaced in crescent at adaxial edge of areole, along margins of areoles, and in subapical tuft, yellow, to 4 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 deep yellow with red basal portions, to 35 mm;

filaments yellow;

anthers pale yellow;

style cream;

stigma lobes yellow-green.

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

areoles 22–36.

often sterile, sometimes proliferating, yellow to red, ovoid to obconic, 28–32 × 13–22 mm, usually fleshy, becoming dry, tuberculate, glabrous;

areoles 20–30, distal areoles bearing 1–4 red-brown and white spines, to 25 mm.

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

girdle protruding 0.5 mm.

few, tan, subcircular to irregularly shaped, 4–5 mm diam.;

girdle protruding to 1 mm.

= 66.

= 44.