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, dark green, flattened, subcircular to broadly obovate, 16–25 × 16–19 cm, nearly smooth, glabrous;

areoles 8–10 per diagonal across midstem segment, prominent, subcircular, 4.5–5.5 mm, greatly enlarging to 10 mm diam.;

wool tan to 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.

5–13 per areole, in most areoles, usually reflexed, translucent yellow, aging red-brown, angular, curved, subulate, the longest 20–25(–50) mm.

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

in rather dense crescent along adaxial margins, increasing in length toward base, subapical tuft poorly developed, tan, aging 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 yellow throughout, 25–40 mm;

filaments yellow to orange-yellow;

anthers yellow;

style red;

stigma lobes green or light green.

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

areoles 22–36.

red to red-purple, pale yellow inside, with seed pulp red, subspheric to barrel-shaped, 37–60 × 30–45 mm, juicy, glabrous, spineless;

areoles 23–63.

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

girdle protruding 0.5 mm.

gray-brown, subcircular to semicircular, 3.5–4 mm diam.;

girdle protruding to 0.4 mm.

= 66.

= 33 (an abnormal, polyhaploid individual), 66.