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, yellow-green to blue-green, flattened, circular to obovate to rhombic, or apex tapering, elongate, 15–40(–120) × 10–40 cm, ± tuberculate, glabrous, often glaucous;

areoles 5–8 per diagonal row across mid-stem segments, evenly distributed on stem segment to absent, subcircular to obovate, 4–7 × 4–6 mm;

wool tawny, 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.

(0–)1–6(–12) per areole, white to yellow, usually red to dark brown at extreme bases, aging gray to ± black, subulate, straight to curved, flattened to angular at least near base, the longest spreading to strongly reflexed, 10–30(–50) mm.

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

widely spaced, sparse in crescent at adaxial edge, encircling areole or nearly so, and scattered in subapical tuft, yellow to red-brown, aging gray to blackish, of irregular lengths, to 10 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 uniformly yellow to buff, sometimes orange to pink to red (rarely whitish), 30–40 mm;

filaments, anthers, and style whitish to cream;

stigma lobes yellow-green to green.

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

areoles 22–36.

dark red to purple throughout, sometimes stipitate, ovate-elongate to barrel-shaped, 35–90 × 20–40 mm, juicy (bleeding and staining), glabrous, spineless;

areoles 20–32 usually toward apex.

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

girdle protruding 0.5 mm.

tan to grayish, subcircular to deltoid, flattened, 2.5–6 × 2–5 mm;

girdle protruding 0.3–0.5 mm.

= 66.