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, bright green, flattened, circular to elliptic-obovate, (5–)7–10(–15) × (3–)4–8(–10) cm, low tuberculate, puberulent;

areoles (9–)11–16 per diagonal row across midstem segment, subcircular, 2–5 mm diam.;

wool white to tan, aging 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.

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

numerous, nearly filling areole, usually yellow or whitish, sometimes reddish brown, to 3 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 bright yellow throughout, aging peach, 25–30 mm;

filaments and style white;

anthers yellowish;

stigma lobes dark green.

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

areoles 22–36.

red, spheric to ovoid, 20–25 × 12–16 mm, fleshy, pubescent, spineless;

areoles 35–50.

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

girdle protruding 0.5 mm.

tan, nearly spheric (slightly flattened), 1–1.2 mm (perhaps infertile);

girdle protruding to 0.5 mm.

= 66.

= 22.