Flora of North America species comparison

segments not easily detached, green, elliptic to narrowly to broadly obovate to circular, 4–27 × 2–18 cm, low tuberculate;

areoles 4–14 per diagonal row across midstem segment, subcircular, 3–6 mm;

wool tan to brown.

segments not disarticulating, dark green, flattened, subcircular to broadly obovate, 16–25 × 16–19 cm, nearly smooth, glabrous;

areoles 8–10 per diagonal across midstem segment, prominent, subcircular, 4.5–5.5 mm, greatly enlarging to 10 mm diam.;

wool tan to gray.

at all or only distal areoles of stem segment, terete to flattened, stout to acicular to bristlelike, straight to curling, of 1 or 2 kinds;

if 1 kind: 0–18 per areole, spreading and curling in various directions, sometimes straight, erect, ascending to deflexed, yellow to dark brown to black, turning gray, pink-gray to gray-brown, longest (35–)40–90(–185) mm;

if ± 2 kinds: major spines (0–)1–5, reflexed to porrect, yellow-brown to brown to gray, longest 20–150 mm;

minor spines (0–)5–11, deflexed, white to white-gray, longest 4–16 mm.

5–13 per areole, in most areoles, usually reflexed, translucent yellow, aging red-brown, angular, curved, subulate, the longest 20–25(–50) mm.

inconspicuous, in narrow, tidy crescent at adaxial edge of areole or in broad, brushy crescent and tuft, yellow to reddish, aging brown, to 10 mm.

in rather dense crescent along adaxial margins, increasing in length toward base, subapical tuft poorly developed, tan, aging brown, to 6 mm.

inner tepals yellow to magenta throughout, 25–40 mm;

filaments white, yellow, or red to magenta (flowers may superficially appear bicolored);

anthers yellow;

style white to pale pink;

stigma lobes green.

inner tepals yellow throughout, 25–40 mm;

filaments yellow to orange-yellow;

anthers yellow;

style red;

stigma lobes green or light green.

tan to brown, ± cylindric, 15–45 × 12–25 mm, dry at maturity, glabrous, sometimes burlike;

areoles 10–33, each or only distal areoles bearing 3–16 spines, 4–20 mm.

red to red-purple, pale yellow inside, with seed pulp red, subspheric to barrel-shaped, 37–60 × 30–45 mm, juicy, glabrous, spineless;

areoles 23–63.

tan to gray, flattened, warped, oblong to subcircular, 3–7 × 2–4 mm;

girdle protruding 1–2 mm.

gray-brown, subcircular to semicircular, 3.5–4 mm diam.;

girdle protruding to 0.4 mm.

= 33 (an abnormal, polyhaploid individual), 66.