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, dark green, cuneate-obovate to commonly rhombic, 5–20 × 4–8 cm, fleshy but firm;

areoles 4–6(–8) per diagonal row across midstem segment, oval to subcircular, 2–4 mm diam.;

wool tan.

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–)1–6 per areole, usually in distal 40% of stem segment, gray-white to red-brown, erect or reflexed, terete or proximal ones flattened, sometimes spirally twisted, longest to 60 mm, very slender, 0.2 mm diam.

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

well developed in adaxial tuft, yellow or tan to brown-red, aging dull brown, to 6 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 red throughout or with red basal portions, 25–35 mm;

filaments pale yellow;

anthers yellow;

style whitish;

stigma lobes cream to yellow.

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

areoles 22–36.

green to yellowish to dull red, long stipitate, elongate-obovoid, 25–40 × 15–40 mm, fleshy, base not narrowed, glabrous, spineless or nearly so;

umbilicus deep;

areoles 14–26.

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

girdle protruding 0.5 mm.

tan to gray, subcircular, 4–5 mm, thickish, warped;

girdle protruding to 0.5 mm.

= 66.

= 44.