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, deep green, flattened, subcircular to obovate, 13–20 × 8–10 cm, nearly smooth, glabrous;

areoles 5–7 per diagonal row across midstem segment, subcircular, 4–5 mm diam.;

wool brown, long.

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.

commonly absent or evenly distributed with 1–3(–8) per areole, deflexed, yellow or brown, tipped yellow or mottled brown, straight, acicular, the longest to 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 and evenly spaced, conspicuous, radiating like star or pincushion, pale to deep red-brown, sometimes tipped yellow, 3–8 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 deep red (rarely magenta), to 30 mm;

anthers yellow;

filaments and style usually cream to pink;

stigma lobes dark green.

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

areoles 22–36.

purplish red, ovoid to pyriform, 30–38 × 17–25 mm, juicy, glabrous, spineless;

areoles 24–26.

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

girdle protruding 0.5 mm.

subcircular, 3–3.5 mm diam.;

girdle size unknown.

= 66.

= 44.