Flora of North America species comparison

segments not easily detached, dark green, cuneate-obovate to commonly rhombic, 5–20 × 4–8 cm, fleshy but firm;

areoles 4–6(–8) per diagonal row across midstem segment, oval to subcircular, 2–4 mm diam.;

wool tan.

segments easily detached when terminal, dark green, subspheric to subcylindric, to flattened and elliptic obovate, (1.5–)2–5.5 × (1–)1.5–3 cm, low tuberculate (pronounced when dried), glabrous;

areoles 3–5 per diagonal row across midstem segment, oval, 3 × 2.5 mm;

wool white.

(0–)1–6 per areole, usually in distal 40% of stem segment, gray-white to red-brown, erect or reflexed, terete or proximal ones flattened, sometimes spirally twisted, longest to 60 mm, very slender, 0.2 mm diam.

3–8 per areole, in most areoles spreading, gray with brown tips, straight, ± acicular, terete, the longest 8–24 mm; depressed spines at base of areoles 0–3, 1–3 mm.

well developed in adaxial tuft, yellow or tan to brown-red, aging dull brown, to 6 mm.

in crescent at adaxial margin of areole, tan to brown, inconspicuous, to 3 mm.

inner tepals red throughout or with red basal portions, 25–35 mm;

filaments pale yellow;

anthers yellow;

style whitish;

stigma lobes cream to yellow.

inner tepals yellow, sometimes basally red, 20–26 mm;

filaments white or red;

anthers yellow;

style white;

stigma lobes green.

green to yellowish to dull red, long stipitate, elongate-obovoid, 25–40 × 15–40 mm, fleshy, base not narrowed, glabrous, spineless or nearly so;

umbilicus deep;

areoles 14–26.

tan, 10–30 × 8–15 mm, dry, glabrous;

areoles 12–22, distal areoles bearing 1–6 short spines.

tan to gray, subcircular, 4–5 mm, thickish, warped;

girdle protruding to 0.5 mm.

tan to gray, flattened, warped, oblong to subcircular, 5–6 mm diam.;

girdle protruding 1–1.5 mm.

= 44.

= 66.