Flora of North America species comparison

segments firmly attached, green, 3–9(–15) × 0.5–1.5(–2.2) cm;

tubercles prominent, short, 0.5–1 cm;

areoles oval to obdeltate, 2–6 × 1.5–4 mm;

wool pale yellow to white, aging gray.

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.

(1–)3–8(–10) spines per areole, in all but basalmost areoles, best developed toward apex, interlacing with spines of adjacent areoles, whitish or pale yellow, pale red-brown, sometimes tipped yellow, of 2 kinds;

radial spines slender, flattened basally, deflexed, 5–8 mm, surrounding central spines;

central spines usually 4(–6), spreading into a cross, stout, subterete, 2–3.4(–4.5) cm;

also 0–2 bristlelike spines;

sheaths whitish to pale yellow (rarely golden) throughout or tipped yellow to golden.

in adaxial tuft, yellow, 1–3 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 to green-yellow, spatulate, 15–25(–30) mm, apiculate;

filaments yellowish or yellow-green;

anthers yellow;

style white to yellowish;

stigma lobes whitish, yellowish, or pale green (rarely pink tinged).

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.

rarely proliferating, yellow to greenish yellow, broadly cylindric to subspheric, 18–30(–35) × 15–22(–32) mm, fleshy, tuberculate, spineless;

tubercles subequal or distalmost longest, usually prominent;

umbilicus 7–8 mm deep;

areoles 36–62.

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.

pale yellow, subcircular to slightly angular in outline, flattened to warped, 3–3.5 × 2.5–3.5 mm, sides smooth or with 1–3 depressions;

girdle smooth.

= 22.

= 22, 44.