Flora of North America species comparison

(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.

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

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 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, 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.