Flora of North America species comparison

diffuse, upper portion not enlarged.

diffuse;

upper portion not enlarged.

nearly spheric to more often cylindric or long cylindric, 5–30 × 5–7 cm, firm;

tubercles 5–12 × 3–7 mm;

axils woolly, bearing 4–15 bristles (0 in young growth) as long as tubercles;

cortex and pith not mucilaginous;

latex absent.

narrowly cylindric or clavate, 6–15(–30) × (1.5–)2–3.5(–4.5) cm, firm;

tubercles 3–5 × 3–5 mm;

axils with abundant, persistent, white wool, longest in flowering zone (where exceeding tubercle tips);

cortex and pith not mucilaginous;

latex absent.

14–26 per areole, pinkish or reddish brown to black, glabrous;

radial spines 11–22 per areole, usually white, bristlelike, 5–7 mm, stiff;

central spines (1–)3–4 per areole, abaxial 1 porrect, hooked, longer, stouter, adaxial central spines ascending with radial spines;

subcentral spines 0.

(33–)43–60 per areole, white to gray, tan, or pale reddish (central spines with darker, usually chalky blue tips), glabrous;

radial spines (27–)37–49 per areole, white or pale tan, bristlelike, 3–6 × 0.05–0.1 mm, stiff, contrasting sharply with robust central spines;

central spines 6–12 per areole, straight or weakly recurving throughout their lengths, not hooked, all ± projecting, abaxial and lateral central spines straighter and shorter, 5–8 mm, adaxial central spines 10–15 mm, all 0.2–0.3 mm diam.

10–22 mm;

outermost tepals entire or short fringed;

inner tepals cream, usually with pinkish or reddish midstripes, longer in bisexual flowers, 5.4 mm diam.;

stigma lobes yellow to greenish yellow or brownish green, 8 mm.

0.9–1.5 × 0.6–1.3 cm;

outermost tepal margins toothed;

inner tepals maroon-red to rusty red or reddish purple, with paler margins, 4 × 1.5 mm;

stigma lobes dull pinkish white to reddish purple or orange-yellow, 1 mm.

bright scarlet, clavate or ovoid, 10–25(–35) × 10 mm, juicy only in fruit walls;

floral remnant persistent.

bright red, cylindric-clavate, 15–20 mm, juicy only in fruit walls;

floral remnant persistent.

black, 0.8 × 0.6 mm, pitted;

testa hard;

anticlinal cell walls straight (not undulate);

interstices conspicuously wider than pit diameters;

pits bowl-shaped.

light to dark brown, 1–1.2 mm, pitted;

testa hard;

anticlinal cell walls deeply sinuate;

interstices narrower than pit diameters;

pits irregularly bowl-shaped.

= 66.

= 22.