Flora of North America species comparison

segments firmly attached, cylindric, 10–30(–50) × 2–2.5(–3) cm;

tubercles prominent, narrow to broad, 1.5–4.5 cm;

areoles elliptic to subcircular, 4–5.5 × 4–5 mm;

wool white or yellowish to tan, aging gray-black.

segments usually firmly attached, terminal segments sometimes easily detached, green to light gray-green, cylindric, 3–7.5(–12) × 1–2.5 cm;

tubercles salient, short oval, 0.4–1.3(–1.5) cm, moderately broad;

areoles broadly elliptic, 4–4.5 × 2–3.5 mm;

wool whitish, yellow to tan, aging gray.

6–20(–30+) per areole, often accompanied by 0–5 short bristlelike spines at areole margins, usually in distal areoles;

major abaxial spines deflexed to divergent, subterete to flattened;

major adaxial spines ascending-divergent, terete, yellow or tan to deep red-brown, aging gray, the central spine longest, 12–30(–38) mm;

sheaths white to grayish with yellow to golden tips, baggy to tight fitting.

(6–)10–17(–22) per areole, accompanied by 0–5 short bristlelike spines at areole margins, at most areoles, most prominent in adaxial ones, much interlaced with those of adjacent areoles, obscuring stems, sometimes brushlike;

major abaxial spines whitish, yellow to tan, usually subterete to flattened, spreading to deflexed, the longest 20–30(–45) mm;

major adaxial spines erect or spreading, white, pale yellow, or tan to brown (rarely deep red-brown), terete, the longest 22–35(–50) mm;

sheaths whitish with yellow to golden tips, baggy.

in inconspicuous to small adaxial tuft, yellow to brown, 0.5–2 mm.

conspicuous in broad adaxial crescent, yellow, 3–4(–5) mm.

inner tepals bright yellow to bronze to brick red, spatulate, 20–30 mm, apiculate-emarginate;

filaments red;

anthers yellow;

style and stigma lobes white to light green.

inner tepals light green to yellow-green, sometimes suffused with maroon or rose, spatulate, 20–23 mm, emarginate-apiculate;

filaments greenish white or yellow, sometimes suffused with bronze or rose, but not red;

anthers yellow;

style and stigma lobes whitish, cream to light green.

tan at maturity, obconic to ellipsoid, 15–35 × 15–20 mm, dry, tuberculate, densely to sparsely spiny (rarely spineless), with apical flange above shallow umbilicus;

basal tubercles longest;

areoles 12–30.

tan at maturity, obconic to subspheric, 13–23 × 11–20 mm, dry, tuberculate, densely spiny, sometimes burlike, with apical flange around deep umbilicus;

basal tubercles not markedly longer than distal ones;

areoles 16–24(–36).

pale yellow to tan, angular or squarish in outline, warped, 3.5–5 × 3–4.5 mm, sides smooth, each with 2–4 large depressions;

girdle smooth.

pale yellow, angular to squarish in outline, warped, 4–6 × 3.5–5 mm, sides smooth, each with 2–4 large depressions;

girdle smooth (rarely with very narrow ridge).

= 22.