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.

segments usually alternate, gray-green or purplish, 2–8 × 0.3–0.5 cm;

tubercles linear, drying as elongate, riblike wrinkles, 1.1–2(–3) cm;

areoles broadly elliptic, (1–)1.5–3.5 × 0.7–2 mm;

wool white to yellow, aging gray.

(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.

0–1(–3) per areole, usually in apical areoles to well distributed, erect, flexible, straight or arching upward or downward, red-brown with gray to whitish coat, tips yellow, aging red-brown, terete, angular-flattened basally, the longest (4–)14–45 mm;

sheaths gray to purple-gray with yellow to red-brown tips or yellow throughout.

in adaxial tuft, yellow, 1–3 mm.

in adaxial tuft or crescent to encircling areole, yellow or reddish brown, 1–3(–5) mm.

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).

inner tepals pale yellow to greenish yellow, sometimes tipped red, narrowly obovate, 5–8 mm, acute, apiculate;

filaments greenish yellow;

anthers yellow;

style yellow;

stigma lobes greenish yellow.

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.

occasionally proliferating, yellow to scarlet (rarely green, sometimes tinged purple, becoming yellow), sometimes stipitate, obovoid, 9–15(–27) × 6–7(–12) mm, fleshy, smooth, spineless;

umbilicus 2–4 mm deep;

areoles 16–20.

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.

pale yellow, suborbicular to squarish and crenate in outline, warped, 3–4.5 mm diam., sides smooth, each with 1–3 large depressions;

girdle smooth or with very narrow ridge.

= 22, 44.

= 22, 33, 44.