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, narrowly elliptic or obovate, 10–25(–40) × 7.5–15(–25) cm, tuberculate, making margins appear scalloped between raised areoles, glabrous;

areoles 3–5 per diagonal row across midstem segment, oval, 3–6.5 × 3.5 mm;

wool dense, tan.

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.

0–11 per areole, in nearly all areoles to only in some marginal areoles or absent, spreading in all directions, yellow, aging brown, straight or curving, the longest stout, oval in cross section, 12–40(–60) mm, not markedly barbed.

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

inconspicuous, few to many in crescent at adaxial edge of areole, yellow, aging brown, often incurved, subequal to increasing in length toward adaxial edge of areole, 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 light yellow throughout, 25–30 mm;

filaments yellow;

anthers yellow;

style and stigma lobes yellowish.

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

areoles 22–36.

purplish throughout, stipitate, ellipsoid or barrel-shaped, 40–60 × 25–30(–40) mm, juicy, spineless;

areoles 6–10.

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

girdle protruding 0.5 mm.

tan, subcircular, 4–5 × 4–4.5 mm, with slightly irregular surface;

girdle protruding to 1 mm.

= 66.

= 44 (cultivated), 66.