Flora of North America species comparison

(0–)1–2(–4) per areole, in distal 3/4 of stem segment areoles (to nearly spineless), porrect to spreading, red-brown, aging gray, stout, straight, terete, to 30 mm, strongly barbed.

1–5(–8) per areole, at most areoles, spreading, white with red base, becoming dark red-brown with pale tips, aging gray, stout, usually curved, elliptic in cross section, longest to 70 mm.

in crescent at adaxial edge of areole, pale yellow, aging brown, to 3 mm, longest at areole apex.

closely spaced in crescent at adaxial edge of areole, along margins of areoles, and in subapical tuft, yellow, to 4 mm.

inner tepals yellow throughout, 20–30 mm;

filaments and anthers yellow;

style and stigma lobes white.

inner tepals deep yellow with red basal portions, to 35 mm;

filaments yellow;

anthers pale yellow;

style cream;

stigma lobes yellow-green.

green becoming red-purple at late maturity, barrel-shaped, 18–30 × 12–20 mm, fleshy, glabrous, spineless;

areoles 8–16.

often sterile, sometimes proliferating, yellow to red, ovoid to obconic, 28–32 × 13–22 mm, usually fleshy, becoming dry, tuberculate, glabrous;

areoles 20–30, distal areoles bearing 1–4 red-brown and white spines, to 25 mm.

tan, subcircular, flattened, 4–6 mm diam.;

girdle slightly protruding.

few, tan, subcircular to irregularly shaped, 4–5 mm diam.;

girdle protruding to 1 mm.

= 44.

= 44.