Flora of North America species comparison

segments easily detached, whorled, obscuring trunks, light green, 4–6 × 0.8–1.2 cm;

tubercles prominent, 1–2 cm;

areoles subcircular, 2–3.5 mm in diam.;

wool tan.

6–8 per areole (1–2 bristlelike spines) increasing with time, well distributed along stem, slightly interlacing with spines of adjacent areoles, short;

abaxial spines usually reflexed, whitish, pinkish to red-brown, lightly flattened, the longest 10–18 mm;

adaxial spines erect or spreading, rich red-brown, gray coated basally, subterete, 6–11 mm;

sheaths grayish, tipped brown or yellow to golden Glochids in small adaxial tuft or crescent, dark yellow, to 1 mm.

7–13(–21) per areole, at most areoles, spreading, obscuring stems, yellow- to red-brown to nearly black, tipped yellow, subterete to angularly flattened, the longest 1.5–5 cm;

sheaths loose fitting, ± yellow to tan, 1.5–2 mm diam.

in adaxial tuft, yellow, 2–4 mm.

inner tepals yellow-green, yellow to gold or bronze, or red to rose or magenta, spatulate, apiculate;

filaments yellowish green;

anthers yellow;

style whitish to pale bronze;

stigma lobes whitish.

inner tepals yellow-green, tinged purple-red, aging reddish brown or bronze, spatulate, 15 mm, apiculate;

filaments pale green basally to purplish distally;

anthers orange-yellow;

style cream to pale green, sometimes faint purple-pink distally;

stigma lobes very pale green.

often proliferating, yellowish green or tinged red to purple, often stipitate, obovate, 25–40 × 10–20 mm, leathery-fleshy, tuberculate or smooth, essentially spineless;

tubercles prominent, at first, subequal in length or proximal ones longer, fertile ones swelling and becoming smooth;

umbilicus to 9 mm deep;

areoles 20–30.

usually sterile, often in chains of 2, yellow, top-shaped, 20–30 × 10–20 mm, pulpy, tuberculate, spineless (rarely few-spined);

tubercles subequal;

umbilicus 5–8 mm deep;

areoles 20–35.

yellowish, polygonal in outline, warped, 3.5–5.5 × 2.5–5 mm, sides nearly flattened with depressions and protrusions to angular subspheric;

girdle smooth or in a groove.

, when present, yellow-tan, subcircular, flattened, 3 mm diam., sides smooth;

girdle narrow, not protruding.

= 22.

= 22, 44 (one count).