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, short cylindric, to 20 × 4–6 cm;

ribs 13–19, crests slightly undulate;

areoles 4–8 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.

13–17 per areole, stiff and straight, white, pink, or gray, becoming gray with dark tips;

radial spines 12–17 per areole, appressed to spreading, 2–12 mm;

central spines (0–)1–4 per areole, projecting, 1–4 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.

5–8 × 7–10 cm;

flower tube 15–25 × 8–20 mm;

flower tube hairs 3–5 mm;

inner tepals purplish pink, darker proximal portion and midstripes, 35–45 × 10–22 mm, tips relatively thin and delicate;

anthers dark yellow;

nectar chamber to 3 mm.

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

dark green, brownish tinged, 15–23 mm, pulp white.

= 22.