Flora of North America species comparison

some-what lax often sprawling, longest stems sometimes prostrate, cylindric, 8–40(–100?) × 3.2–15 cm;

ribs (6–)7–10(–12), crests essentially uninterrupted;

areoles (11–)14–52 mm apart.

erect, cylindric, 15–50 × 6–8 cm;

ribs 12–14(–16), crests slightly undulate;

areoles 15–25 mm apart.

6–14 per areole, straight or central spines slightly curved throughout their lengths, ± opaque, white, pale tan, or purplish gray, often extensively tipped or banded with brown;

radial spines 5–10(–13) per areole, 9.5–40(–47) mm, usually less than 1/2 as long as central spines;

central spines 1–4(–5) per areole, all or mostly projecting, abaxial spine porrect or descending, frequently compressed or angular in cross section (sometimes sulcate, keeled, or striate), (12–)20–84(–96) mm.

10–16 per areole, mostly straight or central spines strongly curving down near base;

radial spines 9–11 per areole, pale to golden yellow, aging darker colored or black, 12–15 mm;

central spines 1(–5) per areole, all yellow or whitish, terete, 20–25 mm.

(4.5–)5–7.5 × 5–5.6(–9) cm;

flower tube 10–30 × 10–22(–40) mm;

flower tube hairs 1–2 mm;

inner tepals pink or magenta, darkest proximally, 28–55 × 8–14(–20) mm, tips relatively thin and delicate;

anthers yellow;

nectar chamber 4–6 mm.

5–6 × 5–6 cm;

flower tube 15–20 × 15–25 mm;

flower tube hairs 2 mm;

inner tepals magenta to rose-pink, darker proximally, 30 × 5–12 mm, tips relatively thin and delicate;

anthers yellow;

nectar chamber 5–8 mm.

pale yellow-green or dull reddish, 20–30 mm, pulp white or pale pink.

green, sometimes tinged reddish to brownish, 20–30 mm, pulp white.

= 22.

= 22.