Flora of North America species comparison

segments not disarticulating, gray-green to yellow-green, flattened, circular to broadly obovate, 12–22 × 12.5–20 cm, sometimes wider than long, ± tuberculate, glabrous;

areoles 6–9 per diagonal row across midstem segment, prominent, circular to elliptic, 4–7 × 3–7 mm;

wool tan to brown, aging gray.

(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.

in most areoles, reddish yellow to red-brown;

abaxial ones sometimes whitish;

adaxial spines often yellow;

major spines (0–)4–8(–9) per areole, usually deflexed, sometimes spreading, particularly on stem segment margins, subterete to flattened or channeled adaxially, sometimes curved, stiff, the longest 40–60 mm.

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

crowded in extended marginal crescent, nearly encircling areole, and less dense subapical tuft obscured by long dense wool, yellow to yellow-brown, 1–6(–12) mm.

inner tepals yellow throughout, 20–30 mm;

filaments and anthers yellow;

style and stigma lobes white.

inner tepals yellow sometimes with faint basal reddish blush, broadly obovate, 22–35 mm, apiculate;

filaments and anthers yellow;

style white;

stigma lobes greenish white.

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

areoles 8–16.

dull red with greenish flesh, ovate to obovate, 32–50 × 15–30 mm, fleshy, glabrous, spineless;

umbilicus 4–6 mm deep;

areoles 28–46.

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

girdle slightly protruding.

yellowish, reniform to subcircular, 4–5 mm diam., sides flattened, smooth;

girdle protruding 0.5–0.8 mm.

= 44.

= 22.