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, flattened, obovate to elliptic, 7–22 × 5–12 cm, ± tuberculate, glabrous, glaucous;

areoles 5–7(–8) per diagonal row across midstem segment, subcircular to elliptic, 3–6 × 2.5–3.5 mm;

wool gray.

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 1–6 per areole, over distal 0–70% of stem segment, spreading to reflexed, yellow with chalky white coat and brown to yellow basal portions, aging dark red, straight, subulate, angularly flattened, the longest 20–48 mm.

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

moderately dense in crescent at adaxial edge of areole and sparse or poorly developed in subapical tuft, yellow, aging red-brown, of unequal lengths, 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 yellow, orange, or dull red throughout, 25–35 mm;

filaments orange-yellow sometimes darker near base;

anthers yellow;

style pink to red (rarely white);

stigma lobes green to yellow-green.

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

areoles 22–36.

red-purple throughout, obovoid to subcylindric, 30–55 × 20–40 mm, juicy, glabrous, spineless;

areoles 20–36.

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

girdle protruding 0.5 mm.

tan to gray, 4.5–6 mm diam.;

girdle protruding to 0.5 mm.

= 66.

= 66.